Powered by Deep Web Technologies
Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

EIA - Natural Gas Pipeline Network - Expansion Process Flow Diagram  

Annual Energy Outlook 2012 (EIA)

Natural Gas based on data through 20072008 with selected updates Development and Expansion Process For Natural Gas Pipeline Projects Figure showing the expansion process...

2

TEP process flow diagram  

SciTech Connect

This presentation describes the development of the proposed Process Flow Diagram (PFD) for the Tokamak Exhaust Processing System (TEP) of ITER. A brief review of design efforts leading up to the PFD is followed by a description of the hydrogen-like, air-like, and waterlike processes. Two new design values are described; the mostcommon and most-demanding design values. The proposed PFD is shown to meet specifications under the most-common and mostdemanding design values.

Wilms, R Scott [Los Alamos National Laboratory; Carlson, Bryan [Los Alamos National Laboratory; Coons, James [Los Alamos National Laboratory; Kubic, William [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

3

Diagram 5. Electricity Flow, 2007 (Quadrillion Btu)  

E-Print Network (OSTI)

generation. f Transmission and distribution losses (electricity losses that occur between the pointDiagram 5. Electricity Flow, 2007 (Quadrillion Btu) Energy Information Administration / Annual Energy Review 2007 221 Coal 20.99 Nuclear Electric Power 8.41 Energy Consumed To Generate Electricity 42

Bensel, Terrence G.

4

Smart Grid Conceptual Actors/Data Flow Diagram- Cross Domain...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Smart Grid Conceptual ActorsData Flow Diagram- Cross Domain Network Focued- Open SGSG-Network TF Smart Grid Conceptual ActorsData Flow Diagram- Cross Domain Network Focued- Open...

5

Energy Flow Diagram | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

Science for Energy Flow » Energy Flow Diagram Science for Energy Flow » Energy Flow Diagram Basic Energy Sciences (BES) BES Home About Research Facilities Science Highlights Benefits of BES Funding Opportunities Basic Energy Sciences Advisory Committee (BESAC) News & Resources Program Summaries Brochures Reports Accomplishments Presentations BES and Congress Science for Energy Flow Energy Flow Diagram Seeing Matter Scale of Things Chart Contact Information Basic Energy Sciences U.S. Department of Energy SC-22/Germantown Building 1000 Independence Ave., SW Washington, DC 20585 P: (301) 903-3081 F: (301) 903-6594 E: sc.bes@science.doe.gov More Information » Science for Energy Flow Energy Flow Diagram Print Text Size: A A A RSS Feeds FeedbackShare Page This diagram shows 2010 energy flow from primary sources (oil, natural gas,

6

Use of influence diagrams in gas transfer system option prioritization  

DOE Green Energy (OSTI)

A formal decision-analysis methodology was applied to aid the Department of Energy (DOE) in deciding which of several gas transfer system (GTS) options should be selected. The decision objectives for this case study, i.e., risk and cost, were directly derived from the DOE guidelines. Influence diagrams were used to define the structure of the decision problem and clearly delineate the flow if information. A set of performance matrices wee used in conjunction with the influence diagrams to assess and evaluate the degree to which the objectives of the case study were met. These performance measures were extracted from technical models, design and operating data, and professional judgments. The results were aggregated to provide an overall evaluation of the different design options of the gas transfer system. Consequently, the results of this analysis were used as an aid to DOE to select a viable GTS option.

Heger, A.S. [New Mexico Univ., Albuquerque, NM (United States). Dept. of Chemical and Nuclear Engineering; Garcia, M.D. [Los Alamos National Lab., NM (United States)

1995-08-01T23:59:59.000Z

7

Landfill gas emission prediction using Voronoi diagrams and importance sampling  

Science Conference Proceedings (OSTI)

Municipal solid waste (MSW) landfills are among the nation's largest emitters of methane, a key greenhouse gas, and there is considerable interest in quantifying the surficial methane emissions from landfills. There are limitations in obtaining accurate ... Keywords: Air dispersion modeling, Delaunay tessellation, Kriging, Least squares, MSW landfill, Voronoi diagram

K. R. Mackie; C. D. Cooper

2009-10-01T23:59:59.000Z

8

Feynman diagrams versus Fermi-gas Feynman emulator  

E-Print Network (OSTI)

Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is usually plagued by the intricate quantum statistics at play. Here we present a cross-validation between a new theoretical approach, Bold Diagrammatic Monte Carlo (BDMC), and precision experiments on ultra-cold atoms. Specifically, we compute and measure with unprecedented accuracy the normal-state equation of state of the unitary gas, a prototypical example of a strongly correlated fermionic system. Excellent agreement demonstrates that a series of Feynman diagrams can be controllably resummed in a non-perturbative regime using BDMC. This opens the door to the solution of some of the most challenging problems across many areas of physics.

K. Van Houcke; F. Werner; E. Kozik; N. Prokofev; B. Svistunov; M. J. H. Ku; A. T. Sommer; L. W. Cheuk; A. Schirotzek; M. W. Zwierlein

2011-10-17T23:59:59.000Z

9

Fundamental diagrams for kinetic equations of traffic flow  

E-Print Network (OSTI)

In this paper we investigate the ability of some recently introduced discrete kinetic models of vehicular traffic to catch, in their large time behavior, typical features of theoretical fundamental diagrams. Specifically, we address the so-called "spatially homogeneous problem" and, in the representative case of an exploratory model, we study the qualitative properties of its solutions for a generic number of discrete microstates. This includes, in particular, asymptotic trends and equilibria, whence fundamental diagrams originate.

Luisa Fermo; Andrea Tosin

2013-05-20T23:59:59.000Z

10

A Cascade-Type Global Energy Conversion Diagram Based on WaveMean Flow Interactions  

Science Conference Proceedings (OSTI)

A cascade-type energy conversion diagram is proposed for the purpose of diagnosing the atmospheric general circulation based on wavemean flow interactions. Mass-weighted isentropic zonal means facilitate the expression of nongeostrophic wave ...

Sachiyo Uno; Toshiki Iwasaki

2006-12-01T23:59:59.000Z

11

Load flow analysis: Base cases, data, diagrams, and results  

SciTech Connect

This report describes how an electric utility system is modeled by using load flow techniques to establish a validated power flow case suitable for simulating and evaluating alternative system scenarios. Details of the load flow model are supported by additional technical and descriptive information intended to correlate modeled electrical system parameters with the corresponding physical equipment that makes up the system. Pictures and technical specifications of system equipment from the utility, public, or vendor are provided to support this association for many system components. The report summarizes the load flow model construction, simulation, and validation and describes the general capabilities of an information query system designed to access load flow parameters and other electrical system information.

Portante, E.C.; Kavicky, J.A.; VanKuiken, J.C.; Peerenboom, J.P.

1997-10-01T23:59:59.000Z

12

Enhanced empirical data for the fundamental diagram and the flow through bottlenecks  

E-Print Network (OSTI)

In recent years, several approaches for modelling pedestrian dynamics have been proposed and applied e.g. for design of egress routes. However, so far not much attention has been paid to their 'quantitative' validation. This unsatisfactory situation belongs amongst others on the uncertain and contradictory experimental data base. The fundamental diagram, i.e. the density-dependence of the flow or velocity, is probably the most important relation as it connects the basic parameter to describe the dynamic of crowds. But specifications in different handbooks as well as experimental measurements differ considerably. The same is true for the bottleneck flow. After a comprehensive review of the experimental data base we give an survey of a research project, including experiments with up to 250 persons performed under well controlled laboratory conditions. The trajectories of each person are measured in high precision to analyze the fundamental diagram and the flow through bottlenecks. The trajectories allow to stud...

Seyfried, A; Khler, J; Klingsch, W; Portz, A; Rupprecht, T; Schadschneider, A; Steffen, B; Winkens, A

2008-01-01T23:59:59.000Z

13

Anisotropic collective flow of a Lorentz gas  

E-Print Network (OSTI)

Analytical results for the anisotropic collective flow of a Lorentz gas of massless particles scattering on fixed centres are presented.

Nicolas Borghini; Clement Gombeaud

2011-06-29T23:59:59.000Z

14

VALIDATING UNCERTAINTY ANALYSES FOR GAS FLOW ...  

Science Conference Proceedings (OSTI)

... tank volume to obtain the initial and final mass of gas in the tank ... during a crossover test, but laminar flow elements (LFE) and turbine flowmeters are ...

2012-11-03T23:59:59.000Z

15

Spark gap switch with spiral gas flow  

DOE Patents (OSTI)

A spark gap switch having a contaminate removal system using an injected gas. An annular plate concentric with an electrode of the switch defines flow paths for the injected gas which form a strong spiral flow of the gas in the housing which is effective to remove contaminates from the switch surfaces. The gas along with the contaminates is exhausted from the housing through one of the ends of the switch.

Brucker, J.P.

1988-03-23T23:59:59.000Z

16

Advances in gas-liquid flows 1990  

SciTech Connect

Gas-liquid two-phase flows commonly occur in nature and industrial applications. Rain, clouds, geysers, and waterfalls are examples of natural gas-liquid flow phenomena, whereas industrial applications can be found in nuclear reactors, steam generators, boilers, condensers, evaporators, fuel atomization, heat pipes, electronic equipment cooling, petroleum engineering, chemical process engineering, and many others. The household-variety phenomena such as garden sprinklers, shower, whirlpool bath, dripping faucet, boiling tea pot, and bubbling beer provide daily experience of gas-liquid flows. The papers presented in this volume reflect the variety and richness of gas-liquid two-phase flow and the increasing role it plays in modern technology. This volume contains papers dealing with some recent development in gas-liquid flow science and technology, covering basic gas-liquid flows, measurements and instrumentation, cavitation and flashing flows, countercurrent flow and flooding, flow in various components and geometries liquid metals and thermocapillary effects, heat transfer, nonlinear phenomena, instability, and other special and general topics related to gas-liquid flows.

Kim, J.M. (Texas Univ., Austin, TX (United States). Nuclear Reactor Lab.); Rohatgi, U.S. (Brookhaven National Lab., Upton, NY (United States)); Hashemi, A. (Lockheed Missiles and Space Company (US))

1990-01-01T23:59:59.000Z

17

ANUDlSiTM-40 Load Flow Analysis: Base Cases, Data, Diagrams, and Results  

Office of Scientific and Technical Information (OSTI)

ANUDlSiTM-40 ANUDlSiTM-40 Load Flow Analysis: Base Cases, Data, Diagrams, and Results by E.C. Portante, J.A. Kavicky, J.C. VanKuiken, and J.P. Peerenboom Decision and Information Sciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439 October 1997 Work sponsored by Navy Engineering Logistics Office This report is printed on recycled paper. @ DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness. or use- fulness of any information, apparatus, product, or process disclosed, or represents

18

Phase diagram and universality of the Lennard-Jones gas-liquid system Hiroshi Watanabe, Nobuyasu Ito, and Chin-Kun Hu  

E-Print Network (OSTI)

Phase diagram and universality of the Lennard-Jones gas-liquid system Hiroshi Watanabe, Nobuyasu JOURNAL OF CHEMICAL PHYSICS 136, 204102 (2012) Phase diagram and universality of the Lennard-Jones gas-liquid; published online 23 May 2012) The gas-liquid phase transition of the three-dimensional Lennard

19

Natural gas and electricity optimal power flow  

E-Print Network (OSTI)

Abstract In this paper, the combined natural gas and electric optimal power flow (GEOPF) is presented. It shows fundamental modeling of the natural gas network to be used for the GEOPF, and describes the equality constraints which describe the energy transformation between gas and electric networks at combined nodes (i.e., generators). We also present the formulation of the natural gas loadflow problem, which includes the amount of gas consumed in compressor stations. Case studies are presented to show the sensitivity of the real power generation to wellhead gas prices. Results from the simulation demonstrate that the GEOPF can provide social welfare maximizing solutions considering both gas and electric networks. I.

Seungwon An

2003-01-01T23:59:59.000Z

20

Microfluidic gas flow profiling using remote detection NMR  

E-Print Network (OSTI)

The amount of axial dispersion as the gas flows within thetimes; A, three dispersion curves for gas originating atdispersion measurements. Pressurized hyperpolarized xenon gas

Hilty, Christian; McDonnell, Erin; Granwehr, Josef; Pierce, Kimberly; Han, Song-I Han; Pines, Alexander

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Real gas effects for compressible nozzle flows  

SciTech Connect

Numerical simulation of compressible nozzle flows of real gas with or without the addition of heat is presented. A generalized real gas method, using an upwind scheme and curvilinear coordinates, is applied to solve the unsteady compressible Euler equations in axisymmetric form. The present method is an extension of a previous 2D method, which was developed to solve the problem for a gas having the general equation of state in the form p=p ([rho], i). In the present work the method is generalized for an arbitrary P-V-T equation of state introducing an iterative procedure for the determination of the temperature from the specific internal energy and the flow variables. The solution procedure is applied for the study of real gas effects in an axisymmetric nozzle flow.

Drikakis, D.; Tsangaris, S. (National Technical Univ. of Athens, (Greece). Dept. of Mechanical Engineering)

1993-03-01T23:59:59.000Z

22

Controlling annular gas flow in deep wells  

SciTech Connect

This article reports on the phenomenon of annular gas channeling. It can occur during primary cementing in wells with formations containing gas. Such channeling may lead to interzonal communication down hole, or even gas migration to the surface. Formation gas is normally contained by the cement slurry's hydrostatic pressure. Annular gas channeling usually results from volumetric changes associated with: cement hydration and fluid loss, poor cement placement techniques, high cement free water, cementing gelling properties, and excessive thickening times. Initially, the cement slurry acts as a true fluid, transmitting hydrostatic pressure to the formation gas and preventing its flow into the cement matrix. However, as the cement begins to set, changing from a fluid state to a rigid state, it gradually begins to lose its ability to transmit hydrostatic pressure. This period of change is usually referred to as the ''transition period.'' Shrinkage of the cement volume compounds the problem and eventually can lead to poor binding between the cement and formation, thereby allowing gas to flow through gaps at the formation-cement interface.

Matthews, S.M.; Copeland, J.C.

1987-03-01T23:59:59.000Z

23

Independent to start gas flow in Moldova  

Science Conference Proceedings (OSTI)

A small independent operator hopes to start gas production this year in the eastern European republic of Moldova, which imports all oil and gas, mainly from Russia. Redeco Ltd. LLC, Oklahoma City, is seeking commercial customers in the town of Baimaclia for gas from a planned 5 km sales pipeline from nearby Victorovca field. The company is affiliated with Redexco ltd., Calgary, and Costilla Energy Inc., Midland, Tex. Redeco`s Victorovca 302 workover well in Cantemir County flowed 500 Mcfd of gas in December from 1,976--86 ft in the Miocene Sarmat formation. The well is in the eastern Carpathian basin. Most wells in Victorovca field are 30--45 years old, but Redeco believes it could economically redrill the field. Victorovca field extends about 12 km east-west and 4 km north-south.

NONE

1997-02-03T23:59:59.000Z

24

Investigation of flow characteristics of gas turbines  

SciTech Connect

Measurements carried out in the process of assimilation of gas turbine (GT) plants of 16 different types in starting and working conditions to estimate the operational conditions and characteristics of the main elements (in particular of the turbines) have created a basis for generaliztion of flow characteristics of different turbines and for extending them to a wider range of operational conditions. The studies showed that: flow characteristics of the investigated turbines, independently of the number of stages and the degree of reaction, are described by the elliptic flowrate equation; throughput of similar turbines, i.e., of turbines formed of stages with high reaction, which have low design degrees of expansion, can be determined with satisfactory accuracy by the unique function of the degree of expansion; and in operating the gas turbine plants considerable changes in throughput of the turbines are possible.

Ol' khovskii, G.G.; Ol' khovskaya, N.I.

1978-01-01T23:59:59.000Z

25

NIST Measurement Services: Natural Gas Flow Calibration Service (NGFCS)  

E-Print Network (OSTI)

NIST Measurement Services: Natural Gas Flow Calibration Service (NGFCS) NIST Special Publication of Standards and Technology #12;i Table of Contents for the Natural Gas Flowmeter Calibration Service (NGFCS;1 Abstract This document describes NIST's high pressure natural gas flow calibration service (NGFCS). Flow

Magee, Joseph W.

26

Perturbations in high-velocity gas flow  

DOE Green Energy (OSTI)

High velocity explosive products or other low-density gases are often used to accelerate metal plates to high velocities. Perturbations in otherwise uniform flow configurations are sometimes sufficient to cause interactions that can rapidly destroy the integrity of the plates. In this study perturbations were introduced in uniform gas flows of detonated HE products and strongly shocked polyethylene, CH{sub 2}. The primary diagnostics were smear-camera records obtained when these gases impinged on layers of plexiglas separated by small argon-filled gaps. These records show shock-arrival times at various levels and thus determine not only the size of the perturbation but also its strength. Perturbations in HE gases running into H{sub 2} and in CH{sub 2} into H{sub 2} have been studied. Two-dimensional hydrodynamic calculations are in excellent agreement with the experiments, and enable one to study details of the flow not possible from experimental results. 1 ref., 5 figs.

Harvey, W.B.; McQueen, R.G. (Los Alamos National Lab., NM (USA))

1989-01-01T23:59:59.000Z

27

Phase diagrams in the lattice RPM model: from order-disorder to gas-liquid phase transition  

E-Print Network (OSTI)

The phase behavior of the lattice restricted primitive model (RPM) for ionic systems with additional short-range nearest neighbor (nn) repulsive interactions has been studied by grand canonical Monte Carlo simulations. We obtain a rich phase behavior as the nn strength is varied. In particular, the phase diagram is very similar to the continuum RPM model for high nn strength. Specifically, we have found both gas-liquid phase separation, with associated Ising critical point, and first-order liquid-solid transition. We discuss how the line of continuous order-disorder transitions present for the low nn strength changes into the continuum-space behavior as one increases the nn strength and compare our findings with recent theoretical results by Ciach and Stell [Phys. Rev. Lett. {\\bf 91}, 060601 (2003)].

Alexandre Diehl; Athanassios Z. Panagiotopoulos

2004-12-03T23:59:59.000Z

28

The influence of strange quarks on QCD phase diagram and chemical freeze-out: Results from the hadron resonance gas model  

E-Print Network (OSTI)

We confront the lattice results on QCD phase diagram for two and three flavors with the hadron resonance gas model. Taking into account the truncations in the Taylor-expansion of energy density $\\epsilon$ done on the lattice at finite chemical potential $\\mu$, we find that the hadron resonance gas model under the condition of constant $\\epsilon$ describes very well the lattice phase diagram. We also calculate the chemical freeze-out curve according to the entropy density $s$. The $s$-values are taken from lattice QCD simulations with two and three flavors. We find that this condition is excellent in reproducing the experimentally estimated parameters of the chemical freeze-out.

A. Tawfik

2004-10-25T23:59:59.000Z

29

Gas flow behavior in extremely low permeability rock  

Science Conference Proceedings (OSTI)

This paper presents a numerical model and modeling study of gas flow through extremely low permeability unconventional reservoirs. In contrast to conventional reservoirs

Yu-Shu Wu; Cong Wang

2012-01-01T23:59:59.000Z

30

Gas flow means for improving efficiency of exhaust hoods  

DOE Patents (OSTI)

Apparatus is described for inhibiting the flow of contaminants in an exhaust enclosure toward an individual located adjacent an opening into the exhaust enclosure by providing a gas flow toward a source of contaminants from a position in front of an individual to urge said contaminants away from the individual toward a gas exit port. The apparatus comprises a gas manifold which may be worn by a person as a vest. The manifold has a series of gas outlets on a front face thereof facing away from the individual and toward the contaminants to thereby provide a flow of gas from the front of the individual toward the contaminants. 15 figures.

Gadgil, A.J.

1994-01-11T23:59:59.000Z

31

A New Flow Diagramming Scheme For Mapping And Analysis Of Multi-Product Flows In A Facility  

Science Conference Proceedings (OSTI)

The design of layouts for facilities that process a high variety of products requires the analysis of a large number of different product routings and their spatial representation on a planar layout of the facility. Traditionally, the representations ... Keywords: Material flow analysis, cascading flowlines, cluster analysis, facility layout, modified multi-product process chart (MM-PPC), string alignment

Jin Zhou; Shahrukh A. Irani

2003-01-01T23:59:59.000Z

32

EIA - Natural Gas Pipeline Network - Transportation Process & Flow  

U.S. Energy Information Administration (EIA) Indexed Site

Process and Flow Process and Flow About U.S. Natural Gas Pipelines - Transporting Natural Gas based on data through 2007/2008 with selected updates Transportation Process and Flow Overview | Gathering System | Processing Plant | Transmission Grid | Market Centers/Hubs | Underground Storage | Peak Shaving Overview Transporting natural gas from the wellhead to the final customer involves several physical transfers of custody and multiple processing steps. A natural gas pipeline system begins at the natural gas producing well or field. Once the gas leaves the producing well, a pipeline gathering system directs the flow either to a natural gas processing plant or directly to the mainline transmission grid, depending upon the initial quality of the wellhead product.

33

Phase Diagrams  

Science Conference Proceedings (OSTI)

Mar 7, 2013 ... Computational Thermodynamics and Kinetics: Phase Diagrams ... TMS: Alloy Phases Committee, TMS: Chemistry and Physics of Materials...

34

Microfluidic gas-flow profiling using remote-detection NMR  

E-Print Network (OSTI)

and dispersion measurements. A pres- surized hyperpolarized xenon gas mixture containing 0.3% NMR-active 129Xe [1. The amount of axial dispersion as the gas flows within the enlarged section of the chip is immediately shown in A over all travel times. (C) Three dispersion curves for gas originating at different z

Pines, Alexander

35

Non-isothermal, compressible gas flow for the simulation of an enhanced gas recovery application  

Science Conference Proceedings (OSTI)

In this work, we present a framework for numerical modeling of CO"2 injection into porous media for enhanced gas recovery (EGR) from depleted reservoirs. Physically, we have to deal with non-isothermal, compressible gas flows resulting in a system of ... Keywords: Carbon dioxide sequestration, Enhanced gas recovery, Equation of state, Finite element method, Numerical simulation, Real gas behavior

N. BTtcher; A. -K. Singh; O. Kolditz; R. Liedl

2012-12-01T23:59:59.000Z

36

Gas flow driven by thermal creep in dusty plasma  

Science Conference Proceedings (OSTI)

Thermal creep flow (TCF) is a flow of gas driven by a temperature gradient along a solid boundary. Here, TCF is demonstrated experimentally in a dusty plasma. Stripes on a glass box are heated by laser beam absorption, leading to both TCF and a thermophoretic force. The design of the experiment allows isolating the effect of TCF. A stirring motion of the dust particle suspension is observed. By eliminating all other explanations for this motion, we conclude that TCF at the boundary couples by drag to the bulk gas, causing the bulk gas to flow, thereby stirring the suspension of dust particles. This result provides an experimental verification, for the field of fluid mechanics, that TCF in the slip-flow regime causes steady-state gas flow in a confined volume.

Flanagan, T. M.; Goree, J. [Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242 (United States)

2009-10-15T23:59:59.000Z

37

Numerical simulation of transient gas flow during underbalanced drilling into a gas sand  

Science Conference Proceedings (OSTI)

Shallow gas drilling has long been recognized as a serious problem in offshore operations. Low fracture gradients and shallow casing do not permit shutting- in the well. Computer simulations of gas kicks during drilling require accurate description of the gas flow rate from the formation into the wellbore. The problem is complicated by the fact that during drilling into a gas sand the effective wellbore area exposed to flow is continually changing until the formation has been completely drilled. This paper describes a numerical model developed to calculate gas flow into the wellbore while drilling underbalanced into a gas sand. A two-dimensional finite difference model of transient flow from the reservoir has been coupled with a one-dimensional finite element model of two-phase flow in the wellbore.

Berg, K.A.; Skalle, P. (Dept. of Petroleum Engineering, Univ. of Trondheim (NO)); Podio, A.L. (Dept. of Petroleum Engineering, Univ. of Texas at Austin, Austin, TX (US))

1991-01-01T23:59:59.000Z

38

Relationship of observed flow patterns to gas core reactor criticality  

SciTech Connect

The gas core reactor requires the establishment of stable and unique flow patterns. A recent series of room temperature flow tests have studied the hydrodynamics, particularly involving gases of differing densities. In an actual operating gas core reactor, the central gas of vaporized uranium will have a much higher density than the surrounding coolant. Testing was done in two different sized chambers (18 inch and 36 inch diameter) to study hydrodynamic scaling. Air was employed as the ''coolant'' gas. Air, argon, and freon, smoked for identification, was used to simulate the fuel. A variety of injectors at various locations in the cavity were employed. (auth)

Macbeth, P.J.; Kunze, J.F.; Rogers, V.C.

1975-01-01T23:59:59.000Z

39

GAS-LIQUID FLOW IN STIRRED REACTORS: Trailing Vortices and Gas Accumulation behind Impeller Blades  

E-Print Network (OSTI)

In a gas-liquid stirred reactor, gas tends to accumulate in low-pressure regions behind the impeller blades. Such gas accumulation forming so-called gas cavities, significantly alters impeller performance characteristics. We have computationally investigated gas-liquid flow generated by a Rushton turbine. Rotating Rushton turbine generates trailing vortices behind the blades, which enhance the gas accumulation. Characteristics of these trailing vortices were first investigated by considering a model problem of flow over a single impeller blade. Predicted results were compared with the published experimental data. Circulation velocity and turbulent kinetic energy of the trailing vortices were found to scale with blade tip velocity. Several numerical experiments were carried out to understand interaction of gas bubbles and trailing vortices. Gas-liquid flow in stirred vessel was then simulated by extending the computational snapshot approach of Ranade and Dometti (Chem. Eng. Res. Des. 74...

Vivek V. Ranade; Vaibhav R. Deshpande; Via Cantonale

1998-01-01T23:59:59.000Z

40

Microfluidic gas flow profiling using remote detection NMR  

E-Print Network (OSTI)

B. (1954) Molecular theory of gases and liquids (Wiley, NewK. (1977) The properties of gases and liquids (McGraw-Hill,Microfluidic gas flow profiling using remote detection NMR

Hilty, Christian; McDonnell, Erin; Granwehr, Josef; Pierce, Kimberly; Han, Song-I Han; Pines, Alexander

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

AEO2011: Primary Natural Gas Flows Entering NGTDM Region from...  

Open Energy Info (EERE)

Primary Natural Gas Flows Entering NGTDM Region from Neighboring Regions

42

Flow through shares for Natural Gas exploration (Quebec, Canada) |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Flow through shares for Natural Gas exploration (Quebec, Canada) Flow through shares for Natural Gas exploration (Quebec, Canada) Flow through shares for Natural Gas exploration (Quebec, Canada) < Back Eligibility Utility Industrial Program Info Funding Source Government of Quebec State Quebec Program Type Corporate Tax Incentive Provider Revenu Quebec, Resources Naturalles Quebec A flow-through share is a security issued by an exploration company that waives its exploration deduction in favor of the investor. The Québec Taxation Act enables a private individual to benefit from a significant tax deduction when calculating his or her taxable income. In fact, the Québec system provides for a basic deduction equal to 100 percent of the cost of the flow-through shares. For shares acquired after March 30, 2004 the individual may deduct an additional 25% when exploration costs are incurred

43

Prediction of flow pattern of gas-liquid flow through circular microchannel using probabilistic neural network  

Science Conference Proceedings (OSTI)

The present study attempts to develop a flow pattern indicator for gas-liquid flow in microchannel with the help of artificial neural network (ANN). Out of many neural networks present in literature, probabilistic neural network (PNN) has been chosen ... Keywords: Hydrodynamics, Microchannel, Microstructure, Multiphase flow, Probabilistic neural network, Transition boundary, Turbulence

Seim Timung; Tapas K. Mandal

2013-04-01T23:59:59.000Z

44

Flammable gas interlock spoolpiece flow response test plan and procedure  

DOE Green Energy (OSTI)

The purpose of this test plan and procedure is to test the Whittaker electrochemical cell and the Sierra Monitor Corp. flammable gas monitors in a simulated field flow configuration. The sensors are used on the Rotary Mode Core Sampling (RMCS) Flammable Gas Interlock (FGI), to detect flammable gases, including hydrogen and teminate the core sampling activity at a predetermined concentration level.

Schneider, T.C., Fluor Daniel Hanford

1997-02-13T23:59:59.000Z

45

DYNAMIC MODELING STRATEGY FOR FLOW REGIME TRANSITION IN GAS-LIQUID TWO-PHASE FLOWS  

SciTech Connect

In modeling gas-liquid two-phase flows, the concept of flow regime has been used to characterize the global interfacial structure of the flows. Nearly all constitutive relations that provide closures to the interfacial transfers in two-phase flow models, such as the two-fluid model, are often flow regime dependent. Currently, the determination of the flow regimes is primarily based on flow regime maps or transition criteria, which are developed for steady-state, fully-developed flows and widely applied in nuclear reactor system safety analysis codes, such as RELAP5. As two-phase flows are observed to be dynamic in nature (fully-developed two-phase flows generally do not exist in real applications), it is of importance to model the flow regime transition dynamically for more accurate predictions of two-phase flows. The present work aims to develop a dynamic modeling strategy for determining flow regimes in gas-liquid two-phase flows through the introduction of interfacial area transport equations (IATEs) within the framework of a two-fluid model. The IATE is a transport equation that models the interfacial area concentration by considering the creation and destruction of the interfacial area, such as the fluid particle (bubble or liquid droplet) disintegration, boiling and evaporation; and fluid particle coalescence and condensation, respectively. For the flow regimes beyond bubbly flows, a two-group IATE has been proposed, in which bubbles are divided into two groups based on their size and shape (which are correlated), namely small bubbles and large bubbles. A preliminary approach to dynamically identifying the flow regimes is provided, in which discriminators are based on the predicted information, such as the void fraction and interfacial area concentration of small bubble and large bubble groups. This method is expected to be applied to computer codes to improve their predictive capabilities of gas-liquid two-phase flows, in particular for the applications in which flow regime transition occurs.

X. Wang; X. Sun; H. Zhao

2011-09-01T23:59:59.000Z

46

Intercooler flow path for gas turbines: CFD design and experiments  

DOE Green Energy (OSTI)

The Advanced Turbine Systems (ATS) program was created by the U.S. Department of Energy to develop ultra-high efficiency, environmentally superior, and cost competitive gas turbine systems for generating electricity. Intercooling or cooling of air between compressor stages is a feature under consideration in advanced cycles for the ATS. Intercooling entails cooling of air between the low pressure (LP) and high pressure (HP) compressor sections of the gas turbine. Lower air temperature entering the HP compressor decreases the air volume flow rate and hence, the compression work. Intercooling also lowers temperature at the HP discharge, thus allowing for more effective use of cooling air in the hot gas flow path.

Agrawal, A.K.; Gollahalli, S.R.; Carter, F.L. [Univ. of Oklahoma, Norman, OK (United States)] [and others

1995-12-31T23:59:59.000Z

47

The Energy Transformation Limit Theorem for Gas Flow Systems  

E-Print Network (OSTI)

The limit energy theorem which determines the possibility of transformation the energy flow in power systems in the absence of technical work is investigated and proved for such systems as gas lasers and plasmatrons, chemical gas reactors, vortex tubes, gas-acoustic and other systems, as well as a system of close stars. In the case of the same name ideal gas in the system the maximum ratio of energy conversion effectiveness is linked to the Carnot theorem, which in its turn is connected with the Nernst theorem. However, numerical analyses show that the class of flow energy systems is non-carnot one. The ratio of energy conversion effectiveness depends on the properties of the working medium; a conventional cycle in open-circuit is essentially irreversible. The proved theorem gives a more strongly worded II law of thermodynamics for the selected class of flow energy systems. Implications for astrophysical thermodynamic systems and the theory of a strong shock wave are discussed.

Volov, V T

2011-01-01T23:59:59.000Z

48

Gas mass transfer for stratified flows  

SciTech Connect

We analyzed gas absorption and release in water bodies using existing surface renewal theory. We show a new relation between turbulent momentum and mass transfer from gas to water, including the effects of waves and wave roughness, by evaluating the equilibrum integral turbulent dissipation due to energy transfer to the water from the wind. Using Kolmogoroff turbulence arguments the gas transfer velocity, or mass transfer coefficient, is then naturally and straightforwardly obtained as a non-linear function of the wind speed drag coefficient and the square root of the molecular diffusion coefficient. In dimensionless form, the theory predicts the turbulent Sherwood number to be Sh{sub t} = (2/{radical}{pi}) Sc{sup 1/2}, where Sh{sub t} is based on an integral dissipation length scale in the air. The theory confirms the observed nonlinear variation of the mass transfer coefficient as a function of the wind speed; gives the correct transition with turbulence-centered models for smooth surfaces at low speeds; and predicts experimental data from both laboratory and environmental measurements within the data scatter. The differences between the available laboratory and field data measurements are due to the large differences in the drag coefficient between wind tunnels and oceans. The results also imply that the effect of direct aeration due to bubble entrainment at wave breaking is no more than a 20% increase in the mass transfer for the highest speeds. The theory has importance to mass transfer in both the geophysical and chemical engineering literature.

Duffey, R.B. [Brookhaven National Lab., Upton, NY (United States); Hughes, E.D. [CSA Inc., Idaho Falls, ID (United States)

1995-07-01T23:59:59.000Z

49

Gas mass transfer for stratified flows  

SciTech Connect

We analyzed gas absorption and release in water bodies using existing surface renewal theory. We show a new relation between turbulent momentum and mass transfer from gas to water, including the effects of waves and wave roughness, by evaluating the equilibrium integral turbulent dissipation due to energy transfer to the water from the wind. Using Kolmogoroff turbulence arguments the gas transfer velocity, or mass transfer coefficient, is then naturally and straightforwardly obtained as a non-linear function of the wind speed drag coefficient and the square root of the molecular diffusion coefficient. In dimensionless form, the theory predicts the turbulent Sherwood number to be Sh{sub t} = (2/{radical}{pi})Sc{sup 1/2}, where Sh{sub t} is based on an integral dissipation length scale in the air. The theory confirms the observed nonlinear variation of the mass transfer coefficient as a function of the wind speed; gives the correct transition with turbulence-centered models for smooth surfaces at low speeds; and predicts experimental data from both laboratory and environmental measurements within the data scatter. The differences between the available laboratory and field data measurements are due to the large differences in the drag coefficient between wind tunnels and oceans. The results also imply that the effect of direct aeration due to bubble entrainment at wave breaking is no more than a 20% increase in the mass transfer for the highest speeds. The theory has importance to mass transfer in both the geo-physical and chemical engineering literature.

Duffey, R.B. [Brookhaven National Lab., Upton, NY (United States); Hughes, E.D. [CSA, Inc., Idaho Falls, ID (United States)

1995-06-01T23:59:59.000Z

50

Using project procedure diagrams for milestone planning  

Science Conference Proceedings (OSTI)

This paper presents Project Procedure Diagrams (PPDs) as a technique for specifying and elaborating project milestone plans. The graphical syntax of PPDs is similar to UML activity diagrams. The operational semantics is based on token flow and resembles ...

Klaus Bergner; Jan Friedrich

2010-07-01T23:59:59.000Z

51

Multiphase imaging of gas flow in a nanoporous material using remote detection NMR  

E-Print Network (OSTI)

pore structure on gas flow and dispersion with 129 Xe as thedominates the free gas flow, and dispersion is mainly due toinlet data. B. Dispersion of occluded gas in the center of

Harel, Elad; Granwehr, Josef; Seeley, Juliette A.; Pines, Alex

2005-01-01T23:59:59.000Z

52

Prediction of strongly-heated internal gas flows  

Science Conference Proceedings (OSTI)

The purposes of the present article are to remind practitioners why the usual textbook approaches may not be appropriate for treating gas flows heated from the surface with large heat fluxes and to review the successes of some recent applications of turbulence models to this case. Simulations from various turbulence models have been assessed by comparison to the measurements of internal mean velocity and temperature distributions by Shehata for turbulent, laminarizing and intermediate flows with significant gas property variation. Of about fifteen models considered, five were judged to provide adequate predictions.

McEligot, D.M. [Lockheed Martin Idaho Technologies Co., Idaho Falls, ID (United States). Idaho National Engineering and Environmental Lab.]|[Univ. of Arizona, Tucson, AZ (United States)]|[Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan); Shehata, A.M. [Xerox Corp., Webster, NY (United States); Kunugi, Tomoaki [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan)]|[Tokai Univ., Hiratsuka, Kanagawa (Japan)

1997-12-31T23:59:59.000Z

53

Experimental Study of Main Gas Ingestion and Purge Gas Egress Flow in Model Gas Turbine Stages.  

E-Print Network (OSTI)

??Efficient performance of gas turbines depends, among several parameters, on the mainstream gas entry temperature. At the same time, transport of this high temperature gas (more)

Balasubramanian, Jagdish Harihara

2010-01-01T23:59:59.000Z

54

Characterization of hydrotreating catalysts by reversed-flow gas chromatography  

SciTech Connect

A flow perturbation gas chromatographic method, called reversed-flow technique, was introduced in 1980 and has been used to study the kinetics of various surface-catalyzed reactions, as well as for other physicochemical measurements. A review on the method has already been published. The new technique is based on reversing the direction of flow of the carrier gas from time to time. It uses a conventional gas chromatograph with any kind of detector, accommodating in its oven a so-called sampling cell. This consists of a sampling column and a diffusion column and is connected to the carrier gas inlet and the detector via a four-port or six-port valve. By switching the valve from one position to the other, the carrier gas is made to flow through the sampling column either from D{sub 2} to D{sub 1} or in the reversed direction. The sampling column can be filled with a catalyst whereby it plays the role of a catalytic reactor, or it filled with a usual chromatographic material acting as a conventional separation column, or it can contain both kinds of solids. Moreover, this column can be completely empty of any solid material, when it simply acts as a sampling volume to produce chromatographic signals without any separation process. The diffusion column, which was not used in the early papers, is employed either as a device for feeding catalytic or chromatographic beds with a gas diffusion stream, or as a means to study slow rate processes, normally occurring within a gas chromatographic column and usually being described as broadening factors.

Katsanos, N.A. (Univ. of Patras (Greece))

1987-04-01T23:59:59.000Z

55

Numerical simulations of the Macondo well blowout reveal strong control of oil flow by reservoir permeability and exsolution of gas  

E-Print Network (OSTI)

for estimates of the oil and gas flow rate from the Macondoteam and carried out oil and gas flow simulations using theoil-gas system. The flow of oil and gas was simulated using

Oldenburg, C.M.

2013-01-01T23:59:59.000Z

56

Multiphase imaging of gas flow in a nanoporous material using  

E-Print Network (OSTI)

and transport, filtering or as reactors. We report a model study on silica aerogel using a time of the aerogel. The asymmetrical nature of the dispersion pattern alludes to the existence of a stationary and a flow regime in the aerogel. An exchange time constant is determined to characterize the gas transfer

Pines, Alexander

57

Axial dispersion in segmented gas-liquid flow: Effects of alternating channel curvature  

E-Print Network (OSTI)

Axial dispersion in segmented gas-liquid flow: Effects of alternating channel curvature Metin of channel curvature on the axial dispersion in segmented gas-liquid flows are studied computationally.1063/1.3531742 I. INTRODUCTION Segmented gas-liquid flow also known as Taylor flow has been studied extensively

Muradoglu, Metin

58

Predicting enhanced mass flow rates in gas microchannels using nonkinetic models  

E-Print Network (OSTI)

Different nonkinetic approaches are adopted in this paper towards theoretically predicting the experimentally observed phenomenon of enhanced mass flow rates accompanying pressure-driven rarefied gas flows through ...

Dadzie, S. Kokou

59

Capacitance-based prover for gas flow meters  

E-Print Network (OSTI)

The focus of this research was to examine a novel method for calibrating natural gas flow meters. This new method can accommodate very large flow rates and it avoids common problems associated with current meter proving techniques. In this method, the amount of gas accumulated in a vessel of fixed. volume is determined by measuring the change in capacitance of the vessel with respect to time. Because the accumulator has a fixed volume, the problems inherent with the mechanical motions involved in volumetric provers such as bell provers and piston provers are eliminated. Accurate measurements can also be made in larger vessels than would be feasible for gravimetric provers, especially for in situ calibrations.

Pipkins, Sean Patrick

1995-01-01T23:59:59.000Z

60

Numerical Simulation of Gas/Solid Flow in a Novel Annular Spouted Bed with Multiple Gas Nozzles  

Science Conference Proceedings (OSTI)

A novel annular spouted bed with multiple gas nozzles, has been proposed for dryness, pyrolysis, and gasification of coal particulates. It consists of two homocentric upright cylinders with some annularly located spouting gas nozzles between inner and ... Keywords: gas/solid flow, CFD, Eulerian multiphase model, kinetic theory of granular flow, annular spouted bed

Gong Xi-wu; Hu Guo-xin; Zhou Hai-jiang; Shi Qian

2009-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Transition to Three-dimensional Waves in Cocurrent Gas-liquid Flows  

E-Print Network (OSTI)

Chapter 1 Transition to Three-dimensional Waves in Cocurrent Gas-liquid Flows W. C. Kuru, M on the interface of a gas-liquid flow in a horizontal channel is studied experimentally. It is found of gas-liquid and liquid-liquid mixtures. For a general case, these flows will have at least 6

McCready, Mark J.

62

Computer modeling of gas flow and gas loading of rock in a bench blasting environment  

SciTech Connect

Numerical modeling can contribute greatly to an understanding of the physics involved in the blasting process. This paper will describe the latest enhancements to the blast modeling code DMC (Distinct Motion Code) (Taylor and Preece, 1989) and will demonstrate the ability of DMC to model gas flow and rock motion in a bench blasting environment. DMC has been used previously to model rock motion associated with blasting in a cratering environment (Preece and Taylor, 1990) and in confined volume blasting associated with in-situ oil shale retorting (Preece, 1990 a b). These applications of DMC treated the explosive loading as force versus time functions on specific spheres which were adjusted to obtain correct face velocities. It was recognized that a great need in explosives modeling was the coupling of an ability to simulate gas flow with the rock motion simulation capability of DMC. This was accomplished by executing a finite difference code that computes gas flow through a porous media (Baer and Gross, 1989) in conjunction with DMC. The marriage of these two capabilities has been documented by Preece and Knudsen, 1991. The capabilities that have been added recently to DMC and which will be documented in this paper include: (1) addition of a new equation of state for the explosive gases; (2) modeling of gas flow and sphere loading in a bench environment. 8 refs., 5 figs.

Preece, D.S.; Baer, M.R. (Sandia National Labs., Albuquerque, NM (United States)); Knudsen, S.D. (RE/SPEC, Inc., Albuquerque, NM (United States))

1991-01-01T23:59:59.000Z

63

An Enskog based Monte Carlo method for high Knudsen number non-ideal gas flows  

E-Print Network (OSTI)

high Knudsen number non-ideal gas flows References [1] Gad-121: [2] Bird GA. Molecular gas dynamics. Oxford: Clarendon1976. [3] Bird GA. Molecular Gas Dynamics and the Direct

Wang, Moran; Li, Zhixin

2007-01-01T23:59:59.000Z

64

Coupled rock motion and gas flow modeling in blasting  

SciTech Connect

The spherical element computer code DMC (Distinct Motion Code) used to model rock motion resulting from blasting has been enhanced to allow routine computer simulations of bench blasting. The enhancements required for bench blast simulation include: (1) modifying the gas flow portion of DMC, (2) adding a new explosive gas equation of state capability, (3) modifying the porosity calculation, and (4) accounting for blastwell spacing parallel to the face. A parametric study performed with DMC shows logical variation of the face velocity as burden, spacing, blastwell diameter and explosive type are varied. These additions represent a significant advance in the capability of DMC which will not only aid in understanding the physics involved in blasting but will also become a blast design tool. 8 refs., 7 figs., 1 tab.

Preece, D.S. (Sandia National Labs., Albuquerque, NM (United States)); Knudsen, S.D. (RE/SPEC, Inc., Albuquerque, NM (United States))

1991-01-01T23:59:59.000Z

65

Measurements of Gas Bubble Size Distributions in Flowing Liquid Mercury  

Science Conference Proceedings (OSTI)

ABSTRACT Pressure waves created in liquid mercury pulsed spallation targets have been shown to induce cavitation damage on the target container. One way to mitigate such damage would be to absorb the pressure pulse energy into a dispersed population of small bubbles, however, measuring such a population in mercury is difficult since it is opaque and the mercury is involved in a turbulent flow. Ultrasonic measurements have been attempted on these types of flows, but the flow noise can interfere with the measurement, and the results are unverifiable and often unrealistic. Recently, a flow loop was built and operated at Oak Ridge National Labarotory to assess the capability of various bubbler designs to deliver an adequate population of bubbles to mitigate cavitation damage. The invented diagnostic technique involves flowing the mercury with entrained gas bubbles in a steady state through a horizontal piping section with a glass-window observation port located on the top. The mercury flow is then suddenly stopped and the bubbles are allowed to settle on the glass due to buoyancy. Using a bright-field illumination and a high-speed camera, the arriving bubbles are detected and counted, and then the images can be processed to determine the bubble populations. After using this technique to collect data on each bubbler, bubble size distributions were built for the purpose of quantifying bubbler performance, allowing the selection of the best bubbler options. This paper presents the novel procedure, photographic technique, sample visual results and some example bubble size distributions. The best bubbler options were subsequently used in proton beam irradiation tests performed at the Los Alamos National Laboratory. The cavitation damage results from the irradiated test plates in contact with the mercury are available for correlation with the bubble populations. The most effective mitigating population can now be designed into prototypical geometries for implementation into an actual SNS target.

Wendel, Mark W [ORNL; Riemer, Bernie [ORNL; Abdou, Ashraf A [ORNL

2012-01-01T23:59:59.000Z

66

Lattice gas automata for flow and transport in geochemical systems  

Science Conference Proceedings (OSTI)

Lattice gas automata models are described, which couple solute transport with chemical reactions at mineral surfaces within pore networks. Diffusion in a box calculations are illustrated, which compare directly with Fickian diffusion. Chemical reactions at solid surfaces, including precipitation/dissolution, sorption, and catalytic reaction, can be examined with the model because hydrodynamic transport, solute diffusion and mineral surface processes are all treated explicitly. The simplicity and flexibility of the approach provides the ability to study the interrelationship between fluid flow and chemical reactions in porous materials, at a level of complexity that has not previously been computationally possible.

Janecky, D.R.; Chen, S.; Dawson, S.; Eggert, K.C.; Travis, B.J.

1992-01-01T23:59:59.000Z

67

Lattice gas automata for flow and transport in geochemical systems  

Science Conference Proceedings (OSTI)

Lattice gas automata models are described, which couple solute transport with chemical reactions at mineral surfaces within pore networks. Diffusion in a box calculations are illustrated, which compare directly with Fickian diffusion. Chemical reactions at solid surfaces, including precipitation/dissolution, sorption, and catalytic reaction, can be examined with the model because hydrodynamic transport, solute diffusion and mineral surface processes are all treated explicitly. The simplicity and flexibility of the approach provides the ability to study the interrelationship between fluid flow and chemical reactions in porous materials, at a level of complexity that has not previously been computationally possible.

Janecky, D.R.; Chen, S.; Dawson, S.; Eggert, K.C.; Travis, B.J.

1992-05-01T23:59:59.000Z

68

Acoustic cross-correlation flowmeter for solid-gas flow  

DOE Patents (OSTI)

Apparatus for measuring particle velocity in a solid-gas flow within a pipe includes: first and second transmitting transducers for transmitting first and second ultrasonic signals into the pipe at first and second locations, respectively, along the pipe; an acoustic decoupler, positioned between said first and second transmitting transducers, for acoustically isolating said first and second signals from one another; first and second detecting transducers for detecting said first and second signals and for generating first and second detected signals; and means for cross-correlating said first and second output signals.

Sheen, S.H.; Raptis, A.C.

1984-05-14T23:59:59.000Z

69

Verification of software codes for simulation of unsteady flows in a gas centrifuge  

Science Conference Proceedings (OSTI)

A simple semi-analytical solution is proposed for the problem of an unsteady gas flow in a gas centrifuge. The circulation in the centrifuge is driven by a source/sink of energy and by an external force (deceleration/acceleration of the gas rotation) ... Keywords: mathematical simulation of unsteady flows in a gas centrifuge, numerical solution of gas dynamics equations, semi-analytical solution, verification of software codes

V. A. Abramov; S. V. Bogovalov; V. D. Borisevich; V. D. Borman; V. A. Kislov; I. V. Tronin; V. N. Tronin; S. V. Yupatov

2013-06-01T23:59:59.000Z

70

FORCE2: A multidimensional flow program for gas solids flow theory guide  

SciTech Connect

This report describes the theory and structure of the FORCE2 flow program. The manual describes the governing model equations, solution procedure and their implementation in the computer program. FORCE2 is an extension of an existing B&V multidimensional, two-phase flow program. FORCE2 was developed for application to fluid beds by flow implementing a gas-solids modeling technology derived, in part, during a joint government -- industry research program, ``Erosion of FBC Heat Transfer Tubes,`` coordinated by Argonne National Laboratory. The development of FORCE2 was sponsored by ASEA-Babcock, an industry participant in this program. This manual is the principal documentation for the program theory and organization. Program usage and post-processing of code predictions with the FORCE2 post-processor are described in a companion report, FORCE2 -- A Multidimensional Flow Program for Fluid Beds, User`s Guide. This manual is segmented into sections to facilitate its usage. In section 2.0, the mass and momentum conservation principles, the basis for the code, are presented. In section 3.0, the constitutive relations used in modeling gas-solids hydrodynamics are given. The finite-difference model equations are derived in section 4.0 and the solution procedures described in sections 5.0 and 6.0. Finally, the implementation of the model equations and solution procedure in FORCE2 is described in section 7.0.

Burge, S.W.

1991-05-01T23:59:59.000Z

71

Fluid and heat flow in gas-rich geothermal reservoirs  

DOE Green Energy (OSTI)

Numerical-simulation techniques are used to study the effects of noncondensible gases (CO/sub 2/) on geothermal reservoir behavior in the natural state and during exploitation. It is shown that the presence of CO/sub 2/ has large effects on the thermodynamic conditions of a reservoir in the natural state, especially on temperature distributions and phase compositions. The gas will expand two-phase zones and increase gas saturations to enable flow of CO/sub 2/ through the system. During exploitation, the early pressure drop is primarily due to degassing of the system. This process can cause a very rapid initial pressure drop, on the order of tens of bars, depending upon the initial partial pressure of CO/sub 2/. The following gas content from wells can provide information on in-place gas saturations and relative permeability curves that apply at a given geothermal resource. Site-specific studies are made for the gas-rich two-phase reservoir at the Ohaki geothermal field in New Zealand. A simple lumped-parameter model and a vertical column model are applied to the field data. The results obtained agree well with the natural thermodynamic state of the Ohaki field (pressure and temperature profiles) and a partial pressure of 15 to 25 bars is calculated in the primary reservoirs. The models also agree reasonably well with field data obtained during exploitation of the field. The treatment of thermophysical properties of H/sub 2/O-CO/sub 2/ mixtures for different phase compositions is summarized.

O'Sullivan, M.J.; Bodvarsson, G.S.; Pruess, K.; Blakeley, M.R.

1983-07-01T23:59:59.000Z

72

Using multi-layer models to forecast gas flow rates in tight gas reservoirs  

E-Print Network (OSTI)

The petroleum industry commonly uses single-layer models to characterize and forecast long-term production in tight gas reservoir systems. However, most tight gas reservoirs are layered systems where the permeability and porosity of each layer can vary significantly, often over several orders of magnitude. In addition, the drainage areas of each of the layers can be substantially different. Due to the complexity of such reservoirs, the analysis of pressure and production history using single-layer analyses techniques provide incorrect estimates of permeability, fracture conductivity, drainage area, and fracture half-length. These erroneous values of reservoir properties also provide the reservoir engineer with misleading values of forecasted gas recovery. The main objectives of this research project are: (1) to demonstrate the typical errors that can occur in reservoir properties when single-layer modeling methods are used to history match production data from typical layered tight gas reservoirs, and (2) to use the single-layer match to demonstrate the error that can occur when forecasting long-term gas production for such complex gas reservoirs. A finite-difference reservoir simulator was used to simulate gas production from various layered tight gas reservoirs. These synthetic production data were analyzed using single-layer models to determine reservoir properties. The estimated reservoir properties obtained from the history matches were then used to forecast ten years of cumulative gas production and to find the accuracy of gas reserves estimated for tight gas reservoirs when a single-layer model is used for the analysis. Based on the results obtained in this work, I conclude that the accuracy in reservoir properties and future gas flow rates in layered tight gas reservoirs when analyzed using a single-layer model is a function of the degree of variability in permeability within the layers and the availability of production data to be analyzed. In cases where there is an idea that the reservoir presents a large variability in â??â??kâ?, using a multi-layer model to analyze the production data will provide the reservoir engineer with more accurate estimates of long-term production recovery and reservoir properties.

Jerez Vera, Sergio Armando

2006-12-01T23:59:59.000Z

73

A model for stratified gas-liquid turbulent flow in ducts of arbitrary cross-section  

E-Print Network (OSTI)

93 A model for stratified gas-liquid turbulent flow in ducts of arbitrary cross-section J. M the pressure gradient and the liquid fraction in two-phase gas- liquid fully developed stratified flow.60 Nomenclature. - TWO-PHASE VARIABLES. Definition densities statistical average (gas, liquid) mass average phase

Paris-Sud XI, Université de

74

Steam generators two phase flows numerical simulation with liquid and gas momentum equations  

E-Print Network (OSTI)

Steam generators two phase flows numerical simulation with liquid and gas momentum equations M dimensional two-phase (liquid and gas) flows. The main goal is to improve the mod- eling of kinetic imbalance between the phases. We present a method that solves the mix- ture (liquid-gas) mass and enthalpy equations

Paris-Sud XI, Université de

75

A computational study of axial dispersion in segmented gas-liquid flow Metin Muradoglua  

E-Print Network (OSTI)

A computational study of axial dispersion in segmented gas-liquid flow Metin Muradoglua Department-dimensional gas-liquid flow is studied computationally using a finite-volume/front-tracking method. The effects models. © 2007 American Institute of Physics. DOI: 10.1063/1.2750295 I. INTRODUCTION Segmented gas-liquid

Muradoglu, Metin

76

Understanding the Impacts of Incremental Gas Supply on the Flow ...  

U.S. Energy Information Administration (EIA)

High natural gas prices and sharply higher oil and natural gas field revenues are expected to drive a resurgence in natural gas-directed drilling activity this year ...

77

Study of gas flow dynamics in porous and granular media with laser-polarized ?Xe NMR  

E-Print Network (OSTI)

This thesis presents Nuclear Magnetic Resonance (NMR) studies of gas flow dynamics in porous and granular media by using laser-polarized ?Xe . Two different physical processes, the gas transport in porous rock cores and ...

Wang, Ruopeng, 1972-

2005-01-01T23:59:59.000Z

78

Numerical Simulation of Flow Field in Diesel Centrifugal Gas-Oil Separator Basing on CFD  

Science Conference Proceedings (OSTI)

Aiming at the low efficiency problem of the traditional gas-oil separator, this paper put forward a centrifugal gas-oil separator. In order to identify out the interior fluid field character of centrifugal gas-oil separator, RANS equation, RNG k-e model ... Keywords: Diesel, Centrifugal Gas-oil Separator, Flow Field, Separation Efficiency

Zhiguo Zhao

2012-07-01T23:59:59.000Z

79

Numerical Early Warning Model Research of Landfill Gas Permeation and Diffusion Considering Flow-Temperature Coupling  

Science Conference Proceedings (OSTI)

Based on seepage mechanics in porous medium gas and heat transfer theory, numerical early warning model is established, which is on quantitative description of migration and release of landfill gas and penetration and diffusion of energy, and dynamic ... Keywords: component, landfill gas, flow-temperature coupling, gas pressure and temperature distribution, numerical early warning model

Xue Qiang; Feng Xia-ting; Ma Shi-jin; Zhou Xiao-jun

2009-10-01T23:59:59.000Z

80

Oil and Gas Flow Data from the Top Hat and from the Choke Line...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Flow Data from the Top Hat and from the Choke Line - XLS Oil and Gas Flow Data from the Top Hat and from the Choke Line - XLS Updated through 12:00 AM on July 10, 2010...

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

A Low-Cost, High-Efficiency Periodic Flow Gas Turbine for Distributed Energy Generation  

SciTech Connect

The proposed effort served as a feasibility study for an innovative, low-cost periodic flow gas turbine capable of realizing efficiencies in the 39-48% range.

Dr. Adam London

2008-06-20T23:59:59.000Z

82

Energy Policy Act Transportation Study: Interim Report on Natural Gas Flows and Rates  

Reports and Publications (EIA)

This report, summarized data and studies that could be used to address the impact of legislative and regulatory actions on natural gas transportation rates and flow patterns.

Information Center

1995-10-01T23:59:59.000Z

83

Thermodynamics and Phase Diagrams  

Science Conference Proceedings (OSTI)

...Alloy Phase Diagrams and Microstructure, Metals Handbook Desk Edition, ASM International, 1998, p. 95??114...

84

A CFD study of gas-solid jet in a CFB riser flow  

Science Conference Proceedings (OSTI)

Three-dimensional high-resolution numerical simulations of a gassolid jet in a high-density riser flow were conducted. The impact of gassolid injection on the riser flow hydrodynamics was investigated with respect to voidage, tracer mass fractions, and solids velocity distribution. The behaviors of a gassolid jet in the riser crossflow were studied through the unsteady numerical simulations. Substantial separation of the jetting gas and solids in the riser crossflow was observed. Mixing of the injected gas and solids with the riser flow was investigated and backmixing of gas and solids was evaluated. In the current numerical study, both the overall hydrodynamics of riser flow and the characteristics of gassolid jet were reasonably predicted compared with the experimental measurements made at NETL.

Li, Tingwen; Guenther, Chris

2012-03-01T23:59:59.000Z

85

Localization of shallow gas deposits and uncontrolled gas flows in young and unconsolidated sediments by geophysical methods  

SciTech Connect

The great mass of Neogene sediments in the Hungarian basin, where several hydrocarbon accumulations are known, is affected by Pliocene strike-slip movements, resulting in many [open quotes]flower structures.[close quotes] The gas may migrate from the reservoirs upward to the surface along the faults. Thus, shallow gas deposits can be located in the young, unconsolidated sands. There are also several shallow gas deposits derived from uncontrolled gas flows. In Hungary, the shallow gas reservoirs, which are small but increasingly important, have not yet been explored properly. However, the depleting gas may pollute the water in the soil as well as cause explosions. Our purpose is to develop inexpensive, complete, and highly sophisticated field- and data-processing techniques and an integrated complex of geophysical methods in order to define the limits of shallow gas deposits. To avoid anomalous behavior on seismic sections of the depleting gas, we started from uncontrolled gas flows which require special velocity and amplitude vs. offset analyses. In addition, natural and controlled source electromagnetic/electric surveys with various parameters were applied. An industrial-scale seismic section over an uncontrolled gas flow, special sections over flower structures and geoelectric sections, and a magnetic map are presented. The integrated complex of geophysical methods outlined above is being developed in order to establish the conditions for the exploration of gas reservoirs which have been used close to their locality and which could be recovered inexpensively.

Csoergei, J.; Kummer, I.; Papa, A.; Sipos, J.; Solyom, I.; Takacs, E.; Timar, Z. (Eotvos Lorand Geophysical Institute of Hungary, Budapest (Hungary)); Keresztes, T. (MOL RT, Budapest (Hungary))

1993-09-01T23:59:59.000Z

86

FROM THE COLOR-MAGNITUDE DIAGRAM OF {omega} CENTAURI AND (SUPER-)ASYMPTOTIC GIANT BRANCH STELLAR MODELS TO A GALACTIC PLANE PASSAGE GAS PURGING CHEMICAL EVOLUTION SCENARIO  

Science Conference Proceedings (OSTI)

We have investigated the color-magnitude diagram of {omega} Centauri and find that the blue main sequence (bMS) can be reproduced only by models that have a helium abundance in the range Y = 0.35-0.40. To explain the faint subgiant branch of the reddest stars ('MS-a/RG-a' sequence), isochrones for the observed metallicity ([Fe/H] Almost-Equal-To -0.7) appear to require both a high age ({approx}13 Gyr) and enhanced CNO abundances ([CNO/Fe] Almost-Equal-To 0.9). Y Almost-Equal-To 0.35 must also be assumed in order to counteract the effects of high CNO on turnoff colors and thereby to obtain a good fit to the relatively blue turnoff of this stellar population. This suggests a short chemical evolution period of time (=} 6.8 M{sub Sun }, M{sub He,core} {>=} 1.245 M{sub Sun }) predict too large N enhancements, which limit their role in contributing to the extreme populations. In order to address the observed central concentration of stars with He-rich abundance, we show here quantitatively that highly He- and N-enriched AGB ejecta have particularly efficient cooling properties. Based on these results and on the reconstruction of the orbit of {omega} Cen with respect to the Milky Way, we propose the Galactic plane passage gas purging scenario for the chemical evolution of this cluster. The bMS population formed shortly after the purging of most of the cluster gas as a result of the passage of {omega} Cen through the Galactic disk (which occurs today every {approx}40 Myr for {omega} Cen) when the initial mass function of the dominant population had 'burned' through most of the Type II supernova mass range. AGB stars would eject most of their masses into the gas-depleted cluster through low-velocity winds that sink to the cluster core due to their favorable cooling properties and form the bMS population. In our discussion we follow our model through four passage events, which could explain some key properties not only of the bMS but also of the MS-a/RGB-a and the s-enriched stars.

Herwig, Falk; VandenBerg, Don A.; Navarro, Julio F. [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6 (Canada); Ferguson, Jason [Department of Physics, Wichita State University Wichita, KS 67260 (United States); Paxton, Bill, E-mail: fherwig@uvic.ca, E-mail: vandenbe@uvic.ca, E-mail: jason.ferguson@wichita.edu, E-mail: paxton@kitp.ucsb.edu [KITP/UC Santa Barbara, Santa Barbara, CA 93106 (United States)

2012-10-01T23:59:59.000Z

87

Study of Flow Regimes in Multiply-Fractured Horizontal Wells in Tight Gas and Shale Gas Reservoir Systems  

E-Print Network (OSTI)

Various analytical, semi-analytical, and empirical models have been proposed to characterize rate and pressure behavior as a function of time in tight/shale gas systems featuring a horizontal well with multiple hydraulic fractures. Despite a small number of analytical models and published numerical studies there is currently little consensus regarding the large-scale flow behavior over time in such systems. The purpose of this work is to construct a fit-for-purpose numerical simulator which will account for a variety of production features pertinent to these systems, and to use this model to study the effects of various parameters on flow behavior. Specific features examined in this work include hydraulically fractured horizontal wells, multiple porosity and permeability fields, desorption, and micro-scale flow effects. The theoretical basis of the model is described in Chapter I, along with a validation of the model. We employ the numerical simulator to examine various tight gas and shale gas systems and to illustrate and define the various flow regimes which progressively occur over time. We visualize the flow regimes using both specialized plots of rate and pressure functions, as well as high-resolution maps of pressure distributions. The results of this study are described in Chapter II. We use pressure maps to illustrate the initial linear flow into the hydraulic fractures in a tight gas system, transitioning to compound formation linear flow, and then into elliptical flow. We show that flow behavior is dominated by the fracture configuration due to the extremely low permeability of shale. We also explore the possible effect of microscale flow effects on gas effective permeability and subsequent gas species fractionation. We examine the interaction of sorptive diffusion and Knudsen diffusion. We show that microscale porous media can result in a compositional shift in produced gas concentration without the presence of adsorbed gas. The development and implementation of the micro-flow model is documented in Chapter III. This work expands our understanding of flow behavior in tight gas and shale gas systems, where such an understanding may ultimately be used to estimate reservoir properties and reserves in these types of reservoirs.

Freeman, Craig M.

2010-05-01T23:59:59.000Z

88

Liquid-Gas Relative Permeabilities in Fractures: Effects of Flow Structures, Phase Transformation and Surface  

E-Print Network (OSTI)

SGP-TR-177 Liquid-Gas Relative Permeabilities in Fractures: Effects of Flow Structures, Phase) the liquid-gas relative permeabilities in fractures can be modeled by characterizing the flow structures permeabilities in both smooth and rough fractures. For the theoretical analysis of liquid-vapor relative

Stanford University

89

A quadrature-based third-order moment method for dilute gas-particle flows  

Science Conference Proceedings (OSTI)

Dilute gas-particle flows can be described by a kinetic equation containing terms for spatial transport, gravity, fluid drag, and particle-particle collisions. However, the direct numerical solution of the kinetic equation is intractable for most applications ... Keywords: Boltzmann equation, Gas-particle flows, Kinetic equation, Quadrature method of moments, Velocity distribution function

R. O. Fox

2008-06-01T23:59:59.000Z

90

Flow Integrating Section for a Gas Turbine Engine in Which Turbine Blades are Cooled by Full Compressor Flow  

SciTech Connect

Routing of full compressor flow through hollow turbine blades achieves unusually effective blade cooling and allows a significant increase in turbine inlet gas temperature and, hence, engine efficiency. The invention, ''flow integrating section'' alleviates the turbine dissipation of kinetic energy of air jets leaving the hollow blades as they enter the compressor diffuser.

Steward, W. Gene

1999-11-14T23:59:59.000Z

91

Flow Integrating Section for a Gas Turbine Engine in Which Turbine Blades are Cooled by Full Compressor Flow  

DOE Green Energy (OSTI)

Routing of full compressor flow through hollow turbine blades achieves unusually effective blade cooling and allows a significant increase in turbine inlet gas temperature and, hence, engine efficiency. The invention, ''flow integrating section'' alleviates the turbine dissipation of kinetic energy of air jets leaving the hollow blades as they enter the compressor diffuser.

Steward, W. Gene

1999-11-14T23:59:59.000Z

92

Visualization of Atomization Gas Flow and Melt Break-up Effects in Response to Nozzle Design  

SciTech Connect

Both powder particle size control and efficient use of gas flow energy are highly prized goals for gas atomization of metal and alloy powder to minimize off-size powder inventory (or 'reverb') and excessive gas consumption. Recent progress in the design of close-coupled gas atomization nozzles and the water model simulation of melt feed tubes were coupled with previous results from several types of gas flow characterization methods, e.g., aspiration measurements and gas flow visualization, to make progress toward these goals. Size distribution analysis and high speed video recordings of gas atomization reaction synthesis (GARS) experiments on special ferritic stainless steel alloy powders with an Ar+O{sub 2} gas mixture were performed to investigate the operating mechanisms and possible advantages of several melt flow tube modifications with one specific gas atomization nozzle. In this study, close-coupled gas atomization under closed wake gas flow conditions was demonstrated to produce large yields of ultrafine (dia.<20 {mu}m) powders (up to 32%) with moderate standard deviations (1.62 to 1.99). The increased yield of fine powders is consistent with the dual atomization mechanisms of closed wake gas flow patterns in the near-field of the melt orifice. Enhanced size control by stabilized pre-filming of the melt with a slotted trumpet bell pour tube was not clearly demonstrated in the current experiments, perhaps confounded by the influence of the melt oxidation reaction that occurred simultaneously with the atomization process. For this GARS variation of close-coupled gas atomization, it may be best to utilize the straight cylindrical pour tube and closed wake operation of an atomization nozzle with higher gas mass flow to promote the maximum yields of ultrafine powders that are preferred for the oxide dispersion strengthened alloys made from these powders.

Anderson, Iver; Rieken, Joel; Meyer, John; Byrd, David; Heidloff, Andy

2011-04-01T23:59:59.000Z

93

Observations of gas flows inside a protoplanetary gap  

E-Print Network (OSTI)

Gaseous giant planet formation is thought to occur in the first few million years following stellar birth. Models predict that giant planet formation carves a deep gap in the dust component (shallower in the gas). Infrared observations of the disk around the young star HD142527, at ~140pc, found an inner disk ~10AU in radius, surrounded by a particularly large gap, with a disrupted outer disk beyond 140AU, indicative of a perturbing planetary-mass body at ~90 AU. From radio observations, the bulk mass is molecular and lies in the outer disk, whose continuum emission has a horseshoe morphology. The vigorous stellar accretion rate would deplete the inner disk in less than a year, so in order to sustain the observed accretion, matter must flow from the outer-disk into the cavity and cross the gap. In dynamical models, the putative protoplanets channel outer-disk material into gap-crossing bridges that feed stellar accretion through the inner disk. Here we report observations with the Atacama Large Millimetre Arr...

Casassus, Simon; M., Sebastian Perez; Dent, William R F; Fomalont, Ed; Hagelberg, Janis; Hales, Antonio; Jordn, Andrs; Mawet, Dimitri; Mnard, Francois; Wootten, Al; Wilner, David; Hughes, A Meredith; Schreiber, Matthias R; Girard, Julien H; Ercolano, Barbara; Canovas, Hector; Romn, Pablo E; Salinas, Vachail

2013-01-01T23:59:59.000Z

94

Fuel Nozzle Flow Testing Guideline for Gas Turbine Low-NOx Combustion Systems  

Science Conference Proceedings (OSTI)

The evolution of dry low-NOx (DLN) gas turbine combustion systems capable of achieving single-digit emission levels requires precise control of the fuel/air ratio within each combustor. The primary means of maintaining the required fuel/air ratio control is through flow testing designed to ensure even distribution of fuel to both individual fuel nozzles and combustion chambers around the gas turbine. This report provides fuel nozzle flow testing guidelines for advanced gas turbine ...

2012-12-31T23:59:59.000Z

95

Understanding the Impacts of Incremental Gas Supply on the Flow Dynamics Across the North American Grid  

Reports and Publications (EIA)

The presentation "Understanding the Impacts of Incremental Gas Supply on the Flow Dynamics Across the North American Grid" was given at the Canadian Institute's BC LNG Forum on November 20, 2006. The presentation provides an overview of EIA's long-term natural gas projections under reference case and sensitivity cases from the Annual Energy Outlook 2006, with special emphasis on natural gas flows in the West Coast.

Information Center

2006-12-14T23:59:59.000Z

96

A FLOW VISUALIZATION STUDY OF THE GAS DYNAMICS OF LIQUID METAL ATOMIZATION NOZZLES  

E-Print Network (OSTI)

A FLOW VISUALIZATION STUDY OF THE GAS DYNAMICS OF LIQUID METAL ATOMIZATION NOZZLES S.P. Mates and G-velocity gas to bear on the liquid metal, may point the way towards enhancing powder production capability Gas atomization of liquid metal via close-coupled nozzle technology is used to produce metal powders

Settles, Gary S.

97

A unified moving grid gas-kinetic method in Eulerian space for viscous flow computation  

Science Conference Proceedings (OSTI)

Under a generalized coordinate transformation with arbitrary grid velocity, the gas-kinetic BGK equation is reformulated in a moving frame of reference. Then, a unified conservative gas-kinetic scheme is developed for the viscous flow computation in ... Keywords: 65M06, 76P05, 76T05, Gas-kinetic scheme, Moving grid, Navier-Stokes equations, Unified coordinate system

Changqiu Jin; Kun Xu

2007-03-01T23:59:59.000Z

98

FLOW BEHAVIOR OF GAS-CONDENSATE WELLS A DISSERTATION  

E-Print Network (OSTI)

Simulation Input File 149 xi #12;xii #12;List of Tables 2.1 Four gas-condensate systems with different. . . . . . . . . . . . . . . . . . 63 5.1 Fluid characterization for a multicomponent gas-condensate system. . 113 xiii #12;xiv #12;List

99

NIST Fluid Metrology Calibration Services - Natural Gas Flow  

Science Conference Proceedings (OSTI)

... control, meaning the turbine meters as well as all other auxiliary measurements (eg, temperature, pressure, frequency, gas composition) are ...

2013-01-28T23:59:59.000Z

100

High temperature ultrasonic gas flow sensor based on lead free piezoelectric material  

E-Print Network (OSTI)

are satisfied by flow meters with multiple ultrasonic measurement paths, typically supplied as a spool piece and used in custody transfer applications such as natural gas pipelines. With respect to flow metering in general, a substantial and key body of work... and ?T is the differential temperature. The disadvantages of thermal mass flow meters are discussed at length by Baker [11] and Miller [10]. The response of the instrument to changes in flow velocity is typically slow due to the thermal inertia...

Krsmanovic, Dalibor

2011-11-08T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Influence of gas flow rate on liquid distribution in trickle-beds using perforated plates as liquid distributors  

E-Print Network (OSTI)

Influence of gas flow rate on liquid distribution in trickle- beds using perforated plates devices and a liquid collector were used to study the influence of the gas flow rate on liquid in liquid distribution were evidenced. Indeed, the obtained results show that the influence of gas flow rate

Paris-Sud XI, Université de

102

Ion transport membrane module and vessel system with directed internal gas flow  

DOE Patents (OSTI)

An ion transport membrane system comprising (a) a pressure vessel having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (b) a plurality of planar ion transport membrane modules disposed in the interior of the pressure vessel and arranged in series, each membrane module comprising mixed metal oxide ceramic material and having an interior region and an exterior region; and (c) one or more gas flow control partitions disposed in the interior of the pressure vessel and adapted to change a direction of gas flow within the vessel.

Holmes, Michael Jerome (Thompson, ND); Ohrn, Theodore R. (Alliance, OH); Chen, Christopher Ming-Poh (Allentown, PA)

2010-02-09T23:59:59.000Z

103

Existence and flow behavior of gas at low saturation in geopressured formations. Final report  

DOE Green Energy (OSTI)

The first geopressured brine well tested for the Department of Energy produced gas and brine at a ratio far above the solution ratio for the gas in that brine. One explanation advanced was that the geopressured formation contained gas at a low saturation, and that this gas flowed into the well during the test. This hypothesis is examined and found to be untenable based on evidence from well logs, flow tests and thermodynamics, and on currently accepted concepts for migration and accumulation of petroleum. The probable explanation for the observed high gas/water ratios is shown to be a thin, tight gas-bearing layer in the case of one sand and an updip gas cap in the case of the second and tested.

Matthews, C.S.

1979-04-01T23:59:59.000Z

104

Key New England natural gas pipeline reflects seasonal flow ...  

U.S. Energy Information Administration (EIA)

Northeast natural gas prices frequently increase in winter, as high demand and supply constraints separate local prices from the U.S. Gulf region ...

105

GMAW Shielding Gas Flow Optimisation by Refinement of Nozzle ...  

Science Conference Proceedings (OSTI)

However, sufficient shielding gas coverage of the weld region is essential for the generation of high quality welds, and drafts can be detrimental to its efficiency.

106

Gas-liquid hydrodynamics in Taylor Flows with complex liquids.  

E-Print Network (OSTI)

??Universit di Pisa Facolt di Ingegneria Dipartimento di Ingegneria Chimica, Chimica Industriale e Scienza dei Materiali Relazione di tirocinio in Ingegneria Chimica Gas-liquid hydrodynamics in (more)

ALBERINI, FEDERICO

2010-01-01T23:59:59.000Z

107

NIST Calibration Services for Gas Flow Meters Piston Prover ...  

Science Conference Proceedings (OSTI)

... [8] Tables of Thermal Properties of Gases, Natl. Bur. ... Standards, presented at Appalachian Gas Meas. ... [14] Smith, AJW, The Effect of Oil Films on the ...

2013-03-31T23:59:59.000Z

108

Key New England natural gas pipeline reflects seasonal flow ...  

U.S. Energy Information Administration (EIA)

Liquefied natural gas (LNG) deliveries into New England have been declining in recent years, as low domestic prices provide an unattractive market to LNG shippers.

109

In Natural Gas Pipelines, NIST Goes with the Flow  

Science Conference Proceedings (OSTI)

... flows from producers to consumers through a complex pipeline network totaling ... pressures an order of magnitude smaller than pipelines used in ...

2013-05-01T23:59:59.000Z

110

Analysis of Chemically Reacting Gas Flow and Heat Transfer in Methane Reforming Processes  

Science Conference Proceedings (OSTI)

This paper presents simulation and analysis of gas flow and heat transfer affected by chemical reactions relating to steam reforming of methane in a compact reformer. The reformer conditions such as the combined thermal boundary conditions on solid walls, ...

Guogang Yang; Danting Yue; Xinrong Lv; Jinliang Yuan

2009-10-01T23:59:59.000Z

111

Biomass gasification using a horizontal entrained-flow gasifier and catalytic processing of the product gas.  

E-Print Network (OSTI)

??A novel study on biomass-air gasification using a horizontal entrained-flow gasifier and catalytic processing of the product gas has been conducted. The study was designed (more)

Legonda, Isack Amos

2012-01-01T23:59:59.000Z

112

Flow and heat transfer in gas turbine disk cavities subject to nonuniform external pressure field  

SciTech Connect

Ingestion of hot gas from the main-stream gas path into turbine disk cavities, particularly the first-stage disk cavity, has become a serious concern for the next-generation industrial gas turbines features high rotor inlet temperature. Fluid temperature in the cavities increases further due to windage generated by fluid drag at the rotating and stationary surfaces. The resulting problem of rotor disk heat-up is exacerbated by the high disk rim temperature due to adverse (relatively flat) temperature profile of the mainstream gas in the annular flow passage of the turbine. This describes an investigation into local convective heat transfer coefficient and cooling effectiveness of the rotor disk, flow field in the disk cavity, computation of the flow field and heat transfer in the disk cavity, and mainstream gas injection and rotor disk cooling effectiveness by mass transfer analogy.

Roy, R.P.; Kim, Y.W.; Tong, T.W. [Arizona State Univ., Tempe, AZ (United States). Dept. of Mechanical and Aerospace Engineering

1995-12-31T23:59:59.000Z

113

Gas flow stabilized megavolt spark gap for repetitive pulses  

SciTech Connect

A high voltage spark gap switch including a housing having first and second end walls being spaced apart by a predetermined distance. A first electrode is positioned on the first end wall and a second electrode is positioned on the second end wall. The first and second electrodes are operatively disposed relative to each other and are spaced apart by a predetermined gap. An inlet conduit is provided for supplying gas to the first electrode. The conduit includes a nozzle for dispersing the gas in the shape of an annular jet. The gas is supplied into the housing at a predetermined velocity. A venturi housing is disposed within the second electrode. An exhaust conduit is provided for discharging gas and residue from the housing. The gas supplied at the predetermined velocity to the housing through the inlet conduit and the nozzle in an annular shape traverses the gap between the first and second electrodes and entrains low velocity gas within the housing decreasing the velocity of the gas supplied to the housing and increasing the diameter of the annular shape. The venturi disposed within the second electrode recirculates a large volume of gas to clean and cool the surface of the electrodes.

Lawson, Robert N. (Albuquerque, NM); O' Malley, Martin W. (Albuquerque, NM); Rohwein, Gerald J. (Albuquerque, NM)

1986-01-01T23:59:59.000Z

114

Investigation of flow modifying tools for the continuous unloading of wet-gas wells  

E-Print Network (OSTI)

Liquid loading in low production gas wells is a common problem faced in many producing regions around the world. Once gas rates fall below the minimum lift velocity, it is essential that some action be taken to maintain continuous operation of the well. Commonly applied solutions include: 1) reduction in wellhead pressure (compression); 2) reduction of tubing diameter (velocity strings); and 3) installation of artificial lift (plunger lift or sucker rod pumping). This thesis examines the use of a patented vortex flow modifier to lift liquids from low rate (stripper) gas wells. Vortex Flow LLC has developed a flow modifying tool using the patented EcoVeyor technology developed by EcoTech. This technology has been used successfully for almost a decade to transport solids in the coal and potash industries and is now being adapted to the oil and gas industries. Recent field tests in horizontal production pipelines have shown the ability to alter basic flow characteristics, significantly decreasing backpressure on wells and increasing production. This thesis evaluates this technology for use in the wellbore, where a tool is introduced at the bottom of the tubing string. Laboratory experiments were conducted using a 125-ft vertical flow loop of 2-in diameter clear PVC. In these experiments, the effects of the vortex device on gas and water flow was examined and compared with the behavior in normal pipe flow. An optimized tool was developed that alters the flow patterns in the pipe resulting in improved liquid unloading accompanied by a decrease in the tubing pressure loss by more than 15 percent. The optimized tool also lowered the minimum lift velocity required for liquid unloading. Visual observations at four locations along the test loop confirmed that the liquid phase is transported in an upward helical manner along the pipe wall, providing an improved flow path for the gas phase. Apart from assisting liquid unloading, the flow modifying tool enhances the operational envelope at low gas rates as well as forming smaller slugs during liquid unloading. Therefore the flow modifier can also reduce gas requirements during artificial gas lift and can also serve as a flow stabilizing device.

Ali, Ahsan Jawaid

2003-01-01T23:59:59.000Z

115

Non-uniform isentropic gas flow analysis of explosion in fractured solid media  

Science Conference Proceedings (OSTI)

This paper presents a new formulation of non-uniform isentropic gas flow during an explosion in solid media. The present form takes into account additional effects of variations in geometries of voids and crack openings. Variations of mass, density, ... Keywords: Blast, Combined finite/discrete element method, Explosion, Gas-solid interaction

S. Mohammadi; A. Pooladi

2007-04-01T23:59:59.000Z

116

Multiple temperature kinetic model and gas-kinetic method for hypersonic non-equilibrium flow computations  

Science Conference Proceedings (OSTI)

It is well known that for increasingly rarefied flowfields, the predictions from continuum formulation, such as the Navier-Stokes equations lose accuracy. For the high speed diatomic molecular flow in the transitional regime, the inaccuracies are partially ... Keywords: Gas-kinetic method, Hypersonic and rarefied flows, Multiple temperature kinetic model

Kun Xu; Xin He; Chunpei Cai

2008-07-01T23:59:59.000Z

117

AEO2011: Primary Natural Gas Flows Entering NGTDM Region from Neighboring  

Open Energy Info (EERE)

Primary Natural Gas Flows Entering NGTDM Region from Neighboring Primary Natural Gas Flows Entering NGTDM Region from Neighboring Regions Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is Table 138, and contains only the reference case. This dataset is in billion cubic feet per year. The data is broken down into New England, Middle Atlantic, East North Central, West Central, South Atlantic, East South Central, West South Central, Mountain, Pacific, Florida, Arizona/New Mexico, California. Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords 2011 AEO EIS Natural Gas Data application/vnd.ms-excel icon AEO2011: Primary Natural Gas Flows Entering NGTDM Region from Neighboring Regions- Reference Case (xls, 60 KiB)

118

Multiphase imaging of gas flow in a nanoporous material usingremote detection NMR  

Science Conference Proceedings (OSTI)

Pore structure and connectivity determine how microstructured materials perform in applications such as catalysis, fluid storage and transport, filtering, or as reactors. We report a model study on silica aerogel using a recently introduced time-of-flight (TOF) magnetic resonance imaging technique to characterize the flow field and elucidate the effects of heterogeneities in the pore structure on gas flow and dispersion with Xe-129 as the gas-phase sensor. The observed chemical shift allows the separate visualization of unrestricted xenon and xenon confined in the pores of the aerogel. The asymmetrical nature of the dispersion pattern alludes to the existence of a stationary and a flow regime in the aerogel. An exchange time constant is determined to characterize the gas transfer between them. As a general methodology, this technique provides new insights into the dynamics of flow in porous media where multiple phases or chemical species may be present.

Harel, Elad; Granwehr, Josef; Seeley, Juliette A.; Pines, Alex

2005-10-03T23:59:59.000Z

119

NETL: News Release - DOE Selects 2 Projects to Help Boost Gas Flow from  

NLE Websites -- All DOE Office Websites (Extended Search)

August 15, 2001 August 15, 2001 DOE Selects 2 Projects to Help Boost Gas Flow from Low-Permeability Formations New Technologies Targeted at Future Gas Production From "Tight" Formations in Western U.S. MORGANTOWN, WV - America has vast resources of natural gas, but President Bush's National Energy Policy cautions that domestic production of the easier "conventional" gas could peak as early as 2015. To help prepare for the day when the Nation's increasing demand for clean-burning natural gas will have to be met by gas trapped in denser, more difficult-to-produce "unconventional" formations, the U.S. Department of Energy has selected two firms to develop advanced methods for locating and producing these low permeability gas reservoirs.

120

NUMERICAL STUDY OF CO-CURRENT WATER-DRY GAS FLOW IN GAS GATHERING SYSTEMS.  

E-Print Network (OSTI)

??The optimum operation of the surface production system is one of the key elements needed for the successful operation of natural gas well facilities, particularly (more)

Fernandez Luengo, Juan

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

DEVELOPMENT AND VALIDATION OF A MULTIFIELD MODEL OF CHURN-TURBULENT GAS/LIQUID FLOWS  

DOE Green Energy (OSTI)

The accuracy of numerical predictions for gas/liquid two-phase flows using Computational Multiphase Fluid Dynamics (CMFD) methods strongly depends on the formulation of models governing the interaction between the continuous liquid field and bubbles of different sizes. The purpose of this paper is to develop, test and validate a multifield model of adiabatic gas/liquid flows at intermediate gas concentrations (e.g., churn-turbulent flow regime), in which multiple-size bubbles are divided into a specified number of groups, each representing a prescribed range of sizes. The proposed modeling concept uses transport equations for the continuous liquid field and for each bubble field. The overall model has been implemented in the NPHASE-CMFD computer code. The results of NPHASE-CMFD simulations have been validated against the experimental data from the TOPFLOW test facility. Also, a parametric analysis on the effect of various modeling assumptions has been performed.

Elena A. Tselishcheva; Steven P. Antal; Michael Z. Podowski; Donna Post Guillen

2009-07-01T23:59:59.000Z

122

Rock matrix and fracture analysis of flow in western tight gas sands: 1986 annual report  

SciTech Connect

This report presents progress for the second year of a five-year project concerned with the pore structure and flow properties of low permeability gas sands. The main objective of work during the first year was to carry out advanced core analysis on cores recovered from the Multi-Well Field Experiment. In Phase 2, the properties of both fractured and non-fractured samples (hereafter referred to as matrix) have been studied. Special attention was given to the combined effect of overburden pressure and water saturation on gas flow. 11 refs., 18 figs., 4 tabs.

Morrow, N.R.; Buckley, J.S.; Cather, S.M.; Brower, K.R.; Dandge, V.; Graham, M.; Gonzales, B.

1987-02-01T23:59:59.000Z

123

Radial flow has little effect on clusterization at intermediate energies in the framework of the Lattice Gas Model  

E-Print Network (OSTI)

The Lattice Gas Model was extended to incorporate the effect of radial flow. Contrary to popular belief, radial flow has little effect on the clusterization process in intermediate energy heavy-ion collisions except adding an ordered motion to the particles in the fragmentation source. We compared the results from the lattice gas model with and without radial flow to experimental data. We found that charge yields from central collisions are not significantly affected by inclusion of any reasonable radial flow.

C. B. Das; L. Shi; S. Das Gupta

2004-07-20T23:59:59.000Z

124

Creating Small Gas Bubbles in Flowing Mercury Using Turbulence at an Orifice  

Science Conference Proceedings (OSTI)

Pressure waves created in liquid mercury pulsed spallation targets have been shown to create cavitation damage to the target container. One way to mitigate such damage would be to absorb the pressure pulse energy into a dispersed population of small bubbles, however, creating such a population in mercury is difficult due to the high surface tension and particularly the non-wetting behavior of mercury on gas-injection hardware. If the larger injected gas bubbles can be broken down into small bubbles after they are introduced to the flow, then the material interface problem is avoided. Research at the Oak Ridge National Labarotory is underway to develop a technique that has shown potential to provide an adequate population of small-enough bubbles to a flowing spallation target. This technique involves gas injection at an orifice of a geometry that is optimized to the turbulence intensity and pressure distribution of the flow, while avoiding coalescence of gas at injection sites. The most successful geometry thus far can be described as a square-toothed orifice having a 2.5 bar pressure drop in the nominal flow of 12 L/s for one of the target inlet legs. High-speed video and high-resolution photography have been used to quantify the bubble population on the surface of the mercury downstream of the gas injection sight. Also, computational fluid dynamics has been used to optimize the dimensions of the toothed orifice based on a RANS computed mean flow including turbulent energies such that the turbulent dissipation and pressure field are best suited for turbulent break-up of the gas bubbles.

Wendel, Mark W [ORNL; Abdou, Ashraf A [ORNL; Paquit, Vincent C [ORNL; Felde, David K [ORNL; Riemer, Bernie [ORNL

2010-01-01T23:59:59.000Z

125

Closures for Course-Grid Simulation of Fluidized Gas-Particle Flows  

SciTech Connect

Gas-particle flows in fluidized beds and riser reactors are inherently unstable, and they manifest fluctuations over a wide range of length and time scales. Two-fluid models for such flows reveal unstable modes whose length scale is as small as ten particle diameters. Yet, because of limited computational resources, gas-particle flows in large fluidized beds are invariably simulated by solving discretized versions of the two-fluid model equations over a coarse spatial grid. Such coarse-grid simulations do not resolve the small-scale spatial structures which are known to affect the macroscale flow structures both qualitatively and quantitatively. Thus there is a need to develop filtered two-fluid models which are suitable for coarse-grid simulations and capturing the effect of the small-scale structures through closures in terms of the filtered variables. The overall objective of the project is to develop validated closures for filtered two-fluid models for gas-particle flows, with the transport gasifier as a primary, motivating example. In this project, highly resolved three-dimensional simulations of a kinetic theory based two-fluid model for gas-particle flows have been performed and the statistical information on structures in the 100-1000 particle diameters length scale has been extracted. Based on these results, closures for filtered two-fluid models have been constructed. The filtered model equations and closures have been validated against experimental data and the results obtained in highly resolved simulations of gas-particle flows. The proposed project enables more accurate simulations of not only the transport gasifier, but also many other non-reacting and reacting gas-particle flows in a variety of chemical reactors. The results of this study are in the form of closures which can readily be incorporated into existing multi-phase flow codes such as MFIX (www.mfix.org). Therefore, the benefits of this study can be realized quickly. The training provided by this project has prepared a PhD student to enter research and development careers in DOE laboratories or chemicals/energy-related industries.

Sankaran Sundaresan

2010-02-14T23:59:59.000Z

126

ENERGY EFFICIENT THERMAL MANAGEMENT FOR NATURAL GAS ENGINE AFTERTREATMENT VIA ACTIVE FLOW CONTROL  

Science Conference Proceedings (OSTI)

The project is focused on the development of an energy efficient aftertreatment system capable of reducing NOx and methane by 90% from lean-burn natural gas engines by applying active exhaust flow control. Compared to conventional passive flow-through reactors, the proposed scheme cuts supplemental energy by 50%-70%. The system consists of a Lean NOx Trap (LNT) system and an oxidation catalyst. Through alternating flow control, a major amount of engine exhaust flows through a large portion of the LNT system in the absorption mode, while a small amount of exhaust goes through a small portion of the LNT system in the regeneration or desulfurization mode. By periodically reversing the exhaust gas flow through the oxidation catalyst, a higher temperature profile is maintained in the catalyst bed resulting in greater efficiency of the oxidation catalyst at lower exhaust temperatures. The project involves conceptual design, theoretical analysis, computer simulation, prototype fabrication, and empirical studies. This report details the progress during the first twelve months of the project. The primary activities have been to develop the bench flow reactor system, develop the computer simulation and modeling of the reverse-flow oxidation catalyst, install the engine into the test cell, and begin design of the LNT system.

David K. Irick; Ke Nguyen

2004-04-01T23:59:59.000Z

127

Energy Efficient Thermal Management for Natural Gas Engine Aftertreatment via Active Flow Control  

SciTech Connect

The project is focused on the development of an energy efficient aftertreatment system capable of reducing NOx and methane by 90% from lean-burn natural gas engines by applying active exhaust flow control. Compared to conventional passive flow-through reactors, the proposed scheme cuts supplemental energy by 50%-70%. The system consists of a Lean NOx Trap (LNT) system and an oxidation catalyst. Through alternating flow control, a major amount of engine exhaust flows through a large portion of the LNT system in the absorption mode, while a small amount of exhaust goes through a small portion of the LNT system in the regeneration or desulfurization mode. By periodically reversing the exhaust gas flow through the oxidation catalyst, a higher temperature profile is maintained in the catalyst bed resulting in greater efficiency of the oxidation catalyst at lower exhaust temperatures. The project involves conceptual design, theoretical analysis, computer simulation, prototype fabrication, and empirical studies. This report details the progress during the first twelve months of the project. The primary activities have been to develop the bench flow reactor system, develop the computer simulation and modeling of the reverse-flow oxidation catalyst, install the engine into the test cell, and begin design of the LNT system.

David K. Irick; Ke Nguyen; Vitacheslav Naoumov; Doug Ferguson

2006-04-01T23:59:59.000Z

128

Energy Efficient Thermal Management for Natural Gas Engine Aftertreatment via Active Flow Control  

SciTech Connect

The project is focused on the development of an energy efficient aftertreatment system capable of reducing NOx and methane by 90% from lean-burn natural gas engines by applying active exhaust flow control. Compared to conventional passive flow-through reactors, the proposed scheme cuts supplemental energy by 50%-70%. The system consists of a Lean NOx Trap (LNT) system and an oxidation catalyst. Through alternating flow control, a major amount of engine exhaust flows through a large portion of the LNT system in the absorption mode, while a small amount of exhaust goes through a small portion of the LNT system in the regeneration or desulfurization mode. By periodically reversing the exhaust gas flow through the oxidation catalyst, a higher temperature profile is maintained in the catalyst bed resulting in greater efficiency of the oxidation catalyst at lower exhaust temperatures. The project involves conceptual design, theoretical analysis, computer simulation, prototype fabrication, and empirical studies. This report details the progress during the first twelve months of the project. The primary activities have been to develop the bench flow reactor system, develop the computer simulation and modeling of the reverse-flow oxidation catalyst, install the engine into the test cell, and begin design of the LNT system.

David K. Irick; Ke Nguyen; Vitacheslav Naoumov; Doug Ferguson

2005-04-01T23:59:59.000Z

129

Production of Natural Gas and Fluid Flow in Tight Sand Reservoirs  

Science Conference Proceedings (OSTI)

This document reports progress of this research effort in identifying relationships and defining dependencies between macroscopic reservoir parameters strongly affected by microscopic flow dynamics and production well performance in tight gas sand reservoirs. These dependencies are investigated by identifying the main transport mechanisms at the pore scale that should affect fluids flow at the reservoir scale. A critical review of commercial reservoir simulators, used to predict tight sand gas reservoir, revealed that many are poor when used to model fluid flow through tight reservoirs. Conventional simulators ignore altogether or model incorrectly certain phenomena such as, Knudsen diffusion, electro-kinetic effects, ordinary diffusion mechanisms and water vaporization. We studied the effect of Knudsen's number in Klinkenberg's equation and evaluated the effect of different flow regimes on Klinkenberg's parameter b. We developed a model capable of explaining the pressure dependence of this parameter that has been experimentally observed, but not explained in the conventional formalisms. We demonstrated the relevance of this, so far ignored effect, in tight sands reservoir modeling. A 2-D numerical simulator based on equations that capture the above mentioned phenomena was developed. Dynamic implications of new equations are comprehensively discussed in our work and their relative contribution to the flow rate is evaluated. We performed several simulation sensitivity studies that evidenced that, in general terms, our formalism should be implemented in order to get more reliable tight sands gas reservoirs' predictions.

Maria Cecilia Bravo

2006-06-30T23:59:59.000Z

130

Galactic scale gas flows in colliding galaxies: 3-Dimensional, N-body/hydrodynamics experiments  

NLE Websites -- All DOE Office Websites (Extended Search)

Galactic Scale Gas Flows in Colliding Galaxies: Galactic Scale Gas Flows in Colliding Galaxies: a-Dimensional, N-bodyjHydrodynamics Experiments Susan A. Lamb* NORDITA and Neils Bohr Institute, Blegdamsvej 17, DK-2100, Kpbenhaven 0, Danmark. Richard A. Gerber University of Illinois at Urbana-Champaign, Departments of Physics and Astronomy, 1110 W. Green Street, Urbana, IL 61801, U.S.A. and Dinshaw S. Balsara t Johns Hopkins University, Department of Physics and Astronomy, Homewood Campu.s, Baltimore, MD 21218, U.S.A. Abstract. We present some result.s from three dimensional computer simulations of collisions between models of equal mass gaJaxies, one of which is a rotating, disk galaxy containing both gas and stars and the other is an elliptical contaiuing stars only. We use fully self consistent models in which the

131

Pore-scale mechanisms of gas flow in tight sand reservoirs  

Science Conference Proceedings (OSTI)

Tight gas sands are unconventional hydrocarbon energy resource storing large volume of natural gas. Microscopy and 3D imaging of reservoir samples at different scales and resolutions provide insights into the coaredo not significantly smaller in size than conventional sandstones, the extremely dense grain packing makes the pore space tortuous, and the porosity is small. In some cases the inter-granular void space is presented by micron-scale slits, whose geometry requires imaging at submicron resolutions. Maximal Inscribed Spheres computations simulate different scenarios of capillary-equilibrium two-phase fluid displacement. For tight sands, the simulations predict an unusually low wetting fluid saturation threshold, at which the non-wetting phase becomes disconnected. Flow simulations in combination with Maximal Inscribed Spheres computations evaluate relative permeability curves. The computations show that at the threshold saturation, when the nonwetting fluid becomes disconnected, the flow of both fluids is practically blocked. The nonwetting phase is immobile due to the disconnectedness, while the permeability to the wetting phase remains essentially equal to zero due to the pore space geometry. This observation explains the Permeability Jail, which was defined earlier by others. The gas is trapped by capillarity, and the brine is immobile due to the dynamic effects. At the same time, in drainage, simulations predict that the mobility of at least one of the fluids is greater than zero at all saturations. A pore-scale model of gas condensate dropout predicts the rate to be proportional to the scalar product of the fluid velocity and pressure gradient. The narrowest constriction in the flow path is subject to the highest rate of condensation. The pore-scale model naturally upscales to the Panfilov's Darcy-scale model, which implies that the condensate dropout rate is proportional to the pressure gradient squared. Pressure gradient is the greatest near the matrix-fracture interface. The distinctive two-phase flow properties of tight sand imply that a small amount of gas condensate can seriously affect the recovery rate by blocking gas flow. Dry gas injection, pressure maintenance, or heating can help to preserve the mobility of gas phase. A small amount of water can increase the mobility of gas condensate.

Silin, D.; Kneafsey, T.J.; Ajo-Franklin, J.B.; Nico, P.

2010-11-30T23:59:59.000Z

132

EIA - Natural Gas Pipeline Network - Natural Gas Transmission...  

Annual Energy Outlook 2012 (EIA)

Transmission Path Diagram About U.S. Natural Gas Pipelines - Transporting Natural Gas based on data through 20072008 with selected updates Natural Gas Transmission Path Natural...

133

Landfill Gas Fueled HCCI Demonstration System  

E-Print Network (OSTI)

Simulated Landfill Gas Intake Diagram STEADY STATE OPERATIONlandfill gas. Expanding the understanding of HCCI mode of engine operation

Blizman, Brandon J.; Makel, Darby B.; Mack, John Hunter; Dibble, Robert W.

2006-01-01T23:59:59.000Z

134

A TECHNOLOGY ASSESSMENT AND FEASIBILITY EVALUATION OF NATURAL GAS ENERGY FLOW MEASUREMENT ALTERNATIVES  

Science Conference Proceedings (OSTI)

Deregulation and open access in the natural gas pipeline industry has changed the gas business environment towards greater reliance on local energy flow rate measurement. What was once a large, stable, and well-defined source of natural gas is now a composite from many small suppliers with greatly varying gas compositions. Unfortunately, the traditional approach to energy flow measurement [using a gas chromatograph (GC) for composition assay in conjunction with a flow meter] is only cost effective for large capacity supplies (typically greater than 1 to 30 million scfd). A less costly approach will encourage more widespread use of energy measurement technology. In turn, the US will benefit from tighter gas inventory control, more efficient pipeline and industrial plant operations, and ultimately lower costs to the consumer. An assessment of the state and direction of technology for natural gas energy flow rate measurement is presented. The alternative technologies were ranked according to their potential to dramatically reduce capital and operating and maintenance (O and M) costs, while improving reliability and accuracy. The top-ranked technologies take an unconventional inference approach to the energy measurement problem. Because of that approach, they will not satisfy the fundamental need for composition assay, but have great potential to reduce industry reliance on the GC. Technological feasibility of the inference approach was demonstrated through the successful development of data correlations that relate energy measurement properties (molecular weight, mass-based heating value, standard density, molar ideal gross heating value, standard volumetric heating value, density, and volume-based heating value) to three inferential properties: standard sound speed, carbon dioxide concentration, and nitrogen concentration (temperature and pressure are also required for the last two). The key advantage of this approach is that inexpensive on-line sensors may be used to measure the inferential variables, which can then be applied (through the data correlations) to convert existing flow meters (ultrasonic, orifice, turbine, rotary, Coriolis, diaphragm, etc.) for on-line energy measurement. The practical issues for field development were evaluated using two transducers extracted from a $100 ultrasonic domestic gas meter, and a $400 infrared sensor.

Kendricks A. Behring II; Eric Kelner; Ali Minachi; Cecil R. Sparks; Thomas B. Morrow; Steven J. Svedeman

1999-01-01T23:59:59.000Z

135

The Implications and Flow Behavior of the Hydraulically Fractured Wells in Shale Gas Formation  

E-Print Network (OSTI)

Shale gas formations are known to have low permeability. This low permeability can be as low as 100 nano darcies. Without stimulating wells drilled in the shale gas formations, it is hard to produce them at an economic rate. One of the stimulating approaches is by drilling horizontal wells and hydraulically fracturing the formation. Once the formation is fractured, different flow patterns will occur. The dominant flow regime observed in the shale gas formation is the linear flow or the transient drainage from the formation matrix toward the hydraulic fracture. This flow could extend up to years of production and it can be identified by half slop on the log-log plot of the gas rate against time. It could be utilized to evaluate the hydraulic fracture surface area and eventually evaluate the effectiveness of the completion job. Different models from the literature can be used to evaluate the completion job. One of the models used in this work assumes a rectangular reservoir with a slab shaped matrix between each two hydraulic fractures. From this model, there are at least five flow regions and the two regions discussed are the Region 2 in which bilinear flow occurs as a result of simultaneous drainage form the matrix and hydraulic fracture. The other is Region 4 which results from transient matrix drainage which could extend up to many years. The Barnett shale production data will be utilized throughout this work to show sample of the calculations. This first part of this work will evaluate the field data used in this study following a systematic procedure explained in Chapter III. This part reviews the historical production, reservoir and fluid data and well completion records available for the wells being analyzed. It will also check for data correlations from the data available and explain abnormal flow behaviors that might occur utilizing the field production data. It will explain why some wells might not fit into each model. This will be followed by a preliminary diagnosis, in which flow regimes will be identified, unclear data will be filtered, and interference and liquid loading data will be pointed. After completing the data evaluation, this work will evaluate and compare the different methods available in the literature in order to decide which method will best fit to analyze the production data from the Barnett shale. Formation properties and the original gas in place will be evaluated and compared for different methods.

Almarzooq, Anas Mohammadali S.

2010-12-01T23:59:59.000Z

136

Examples of Phase Diagrams  

Science Conference Proceedings (OSTI)

...The phase diagram of the lead-tin system ( Fig. 31 ) shows the importance of the low-melting eutectic in this system to the success of lead-tin solders. While solders having tin contents between 18.3 to 61.9%

137

Estimation of Critical Flow Velocity for Collapse of Gas Test Loop Booster Fuel Assembly  

Science Conference Proceedings (OSTI)

This paper presents calculations performed to determine the critical flow velocity for plate collapse due to static instability for the Gas Test Loop booster fuel assembly. Long, slender plates arranged in a parallel configuration can experience static divergence and collapse at sufficiently high coolant flow rates. Such collapse was exhibited by the Oak Ridge High Flux Reactor in the 1940s and the Engineering Test Reactor at the Idaho National Laboratory in the 1950s. Theoretical formulas outlined by Miller, based upon wide-beam theory and Bernoullis equation, were used for the analysis. Calculations based upon Millers theory show that the actual coolant flow velocity is only 6% of the predicted critical flow velocity. Since there is a considerable margin between the theoretically predicted plate collapse velocity and the design velocity, the phenomena of plate collapse due to static instability is unlikely.

Guillen; Mark J. Russell

2006-07-01T23:59:59.000Z

138

Lagrangian Prediction Of Disperse Gas-Particle Flow In Cyclone Separators  

E-Print Network (OSTI)

Disperse multiphase flows are very common for processes in mechanical and thermal process technology (e.g. gas--particle or gas--droplet flows, coal combustion, pneumatical conveying, erosion phenomena). Processes for the separation of solid particles from gases or fluids and for the classification and particle size analysis are an important field of interest in process technology. The paper deals with a 3--dimensional Lagrangian approach for the prediction of disperse multiphase flows. The underlying numerical algorithm is based on the PSI--cell approach, where trajectories of a large number of particles are calculated from the equations of motion of the disperse phase. The time--averaged equations of fluid motion are solved by the program package FAN--3D developed by Peri'c and Lilek and modified for gas-particle flow calculations by the authors. The most fundamental features of FAN--3D are : ffl use of non--orthogonal, boundary fitted, numerical grids with arbitrary hexahedral cont...

Thomas Frank; Th. Frank; Qiang Yu; Erik Wassen; Q. Yu

1998-01-01T23:59:59.000Z

139

The spatial distributions of cooling gas and intrinsic X-ray absorbing material in cooling flows  

E-Print Network (OSTI)

We present the results from a study of the spatial distributions of cooling gas and intrinsic X-ray absorbing material in a sample of nearby, X-ray bright cooling flow clusters observed with the Position Sensitive Proportional Counter (PSPC) on ROSAT. Our method of analysis employs X-ray colour profiles, formed from ratios of the surface brightness profiles of the clusters in selected energy bands, and an adapted version of the deprojection code of Fabian et al. (1981). We show that all of the cooling flow clusters in our sample exhibit significant central concentrations of cooling gas. At larger radii the clusters appear approximately isothermal. In detail, the spatial distributions and emissivity of the cooling material are shown to be in excellent agreement with the predictions from the deprojection code, and can be used to constrain the ages of the cooling flows. The X-ray colour profiles also indicate substantial levels of intrinsic X-ray absorption in the clusters. The intrinsic absorption increases with decreasing radius, and is confined to the regions occupied by the cooling flows. We explore a range of likely spatial distributions for the absorbing gas and discuss the complexities

unknown authors

2008-01-01T23:59:59.000Z

140

A Novel Approach For the Simulation of Multiple Flow Mechanisms and Porosities in Shale Gas Reservoirs  

E-Print Network (OSTI)

The state of the art of modeling fluid flow in shale gas reservoirs is dominated by dual porosity models that divide the reservoirs into matrix blocks that significantly contribute to fluid storage and fracture networks which principally control flow capacity. However, recent extensive microscopic studies reveal that there exist massive micro- and nano- pore systems in shale matrices. Because of this, the actual flow mechanisms in shale reservoirs are considerably more complex than can be simulated by the conventional dual porosity models and Darcys Law. Therefore, a model capturing multiple pore scales and flow can provide a better understanding of complex flow mechanisms occurring in these reservoirs. Through the use of a unique simulator, this research work establishes a micro-scale multiple-porosity model for fluid flow in shale reservoirs by capturing the dynamics occurring in three separate porosity systems: organic matter (mainly kerogen); inorganic matter; and natural fractures. Inorganic and organic portions of shale matrix are treated as sub-blocks with different attributes, such as wettability and pore structures. In the organic matter or kerogen, gas desorption and diffusion are the dominant physics. Since the flow regimes are sensitive to pore size, the effects of smaller pores (mainly nanopores and picopores) and larger pores (mainly micropores and nanopores) in kerogen are incorporated in the simulator. The separate inorganic sub-blocks mainly contribute to the ability to better model dynamic water behavior. The multiple porosity model is built upon a unique tool for simulating general multiple porosity systems in which several porosity systems may be tied to each other through arbitrary transfer functions and connectivities. This new model will allow us to better understand complex flow mechanisms and in turn to extend simulation to the reservoir scale including hydraulic fractures through upscaling techniques

Yan, Bicheng

2013-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Corrosion-induced gas generation in a nuclear waste repository: Reactive geochemistry and multiphase flow effect  

DOE Green Energy (OSTI)

Corrosion of steel canisters, stored in a repository for spent fuel and high-level nuclear wastes, leads to the generation and accumulation of hydrogen gas in the backfilled emplacement tunnels, which may significantly affect long-term repository safety. Previous studies used H{sub 2} generation rates based on the volume of the waste or canister material and the stoichiometry of the corrosion reaction. However, iron corrosion and H{sub 2} generation rates vary with time, depending on factors such as amount of iron, water availability, water contact area, and aqueous and solid chemistry. To account for these factors and feedback mechanisms, we developed a chemistry model related to iron corrosion, coupled with two-phase (liquid and gas) flow phenomena that are driven by gas-pressure buildup associated with H{sub 2} generation and water consumption. Results indicate that by dynamically calculating H{sub 2} generation rates based on a simple model of corrosion chemistry, and by coupling this corrosion reaction with two-phase flow processes, the degree and extent of gas pressure buildup could be much smaller compared to a model that neglects the coupling between flow and reactive transport mechanisms. By considering the feedback of corrosion chemistry, the gas pressure increases initially at the canister, but later decreases and eventually returns to a stabilized pressure that is slightly higher than the background pressure. The current study focuses on corrosion under anaerobic conditions for which the coupled hydrogeochemical model was used to examine the role of selected physical parameters on the H{sub 2} gas generation and corresponding pressure buildup in a nuclear waste repository. The developed model can be applied to evaluate the effect of water and mineral chemistry of the buffer and host rock on the corrosion reaction for future site-specific studies.

Xu, T.; Senger, R.; Finsterle, S.

2008-10-15T23:59:59.000Z

142

3 One-Line Diagram and Bus/Branch Model  

E-Print Network (OSTI)

One-line diagram and bus/branch model Ohms law Losses Kirchoffs law Power flow calculations (different model idealizations) Reference bus Power System & LMP Fundamentals WEM 301 2008 ISO New England Inc.

Eugene Litvinov Director; Marginal Loss Pricing; Market System; Major Components; Line Line; Line Line

2008-01-01T23:59:59.000Z

143

Towards a semantics of activity diagrams with semantic variation points  

Science Conference Proceedings (OSTI)

UML activity diagrams have become an established notation to model control and data flow on various levels of abstraction, ranging from fine-grained descriptions of algorithms to high-level workflow models in business applications. A formal semantics ...

Hans Grnniger; Dirk Rei; Bernhard Rumpe

2010-10-01T23:59:59.000Z

144

A Gas-Kinetic Scheme For The Simulation Of Compressible Turbulent Flows  

E-Print Network (OSTI)

A gas-kinetic scheme for the continuum regime is applied to the simulation of turbu- lent compressible flow, by replacing the molecular relaxation time with a turbulent relaxation time in the BGK model. The turbulence dynamics is modelled on the basis of a standard, linear two-equation turbulence model. The hydrodynamic limit of the resulting turbulence model is linear in smooth flow and non-linear in the presence of stronger flow gradients. The non-linear correction terms in the numerical flux are weighed as a function of "rarefaction" - referred to turbulence dynamics and not to molecular dynamics, i.e. measured by the ratio of turbulence to mean flow scales of motion. Even though no assumptions on the nature of the turbulence have been made and a linear two-equation turbulence model is used, the turbulence gas-kinetic scheme seems able to correct the turbulent stress tensor in an effective way; on the basis of a number of turbulence modelling benchmark flow cases, characterized by strong shock - boundary l...

Righi, Marcello

2013-01-01T23:59:59.000Z

145

Liquid-gas-solid flows with lattice Boltzmann: Simulation of floating bodies  

E-Print Network (OSTI)

This paper presents a model for the simulation of liquid-gas-solid flows by means of the lattice Boltzmann method. The approach is built upon previous works for the simulation of liquid-solid particle suspensions on the one hand, and on a liquid-gas free surface model on the other. We show how the two approaches can be unified by a novel set of dynamic cell conversion rules. For evaluation, we concentrate on the rotational stability of non-spherical rigid bodies floating on a plane water surface - a classical hydrostatic problem known from naval architecture. We show the consistency of our method in this kind of flows and obtain convergence towards the ideal solution for the measured heeling stability of a floating box.

Bogner, Simon

2012-01-01T23:59:59.000Z

146

Computational Flow Predictions for the Lower Plenum of a High-Temperature, Gas-Cooled Reactor  

Science Conference Proceedings (OSTI)

Advanced gas-cooled reactors offer the potential advantage of higher efficiency and enhanced safety over present day nuclear reactors. Accurate simulation models of these Generation IV reactors are necessary for design and licensing. One design under consideration by the Very High Temperature Reactor (VHTR) program is a modular, prismatic gas-cooled reactor. In this reactor, the lower plenum region may experience locally high temperatures that can adversely impact the plants structural integrity. Since existing system analysis codes cannot capture the complex flow effects occurring in the lower plenum, computational fluid dynamics (CFD) codes are being employed to model these flows [1]. The goal of the present study is to validate the CFD calculations using experimental data.

Donna Post Guillen

2006-11-01T23:59:59.000Z

147

Constant-pressure production in solution-gas-drive reservoirs; Transient flow  

SciTech Connect

This paper presents procedures to obtain reservoir parameters from constant-pressure drawdown data in solution-gas-drive reservoirs. A novel procedure to determine the mechanical skin factor is introduced. Examples, including a field case, illustrate the use of this procedure. An estimate of the drainage area can be obtained with the derivative of rate data. A theoretical basis for analyzing data by the pressure-squared, p{sup 2}, approach is presented; this procedure permits the approximate determination of sandface effective permeabilities in the transient flow period. For damaged wells, it is possible to obtain rough estimates of the size of the skin zone and the ratio of reservoir/skin-zone permeability when early transient data are available. The expression of the appropriate dimensionless rate in terms of physical properties for solution-gas-drive systems is presented. Finally, this paper presents a procedure to obtain an estimate of the change in sandface saturation during the transient flow period.

Camacho, R.G. (National Univ. of Mexico/PEMEX (MX))

1991-06-01T23:59:59.000Z

148

Investigation of Swirl Flows Applied to the Oil and Gas Industry  

E-Print Network (OSTI)

Understanding how swirl flows can be applied to processes in the oil and gas industry and how problems might hinder them, are the focus of this thesis. Three application areas were identified: wet gas metering, liquid loading in gas wells and erosion at pipe bends due to sand transport. For all three areas, Computational Fluid Dynamics (CFD) simulations were performed. Where available, experimental data were used to validate the CFD results. As a part of this project, a new test loop was conceived for the investigation of sand erosion in pipes. The results obtained from CFD simulations of two-phase (air-water) flow through a pipe with a swirl-inducing device show that generating swirl flow leads to separation of the phases and creates distinct flow patterns within the pipe. This effect can be used in each of the three application areas of interest. For the wet gas metering application, a chart was generated, which suggests the location of maximum liquid deposition downstream of the swirling device used in the ANUMET meter. This will allow taking pressure and phase fraction measurements (from which the liquid flow rate can be determined) where they are most representative of the flow pattern assumed for the ANUMET calculation algorithms. For the liquid loading application, which was taken as an upscaling of the dimensions investigated for the wet gas metering application, the main focus was on the liquid hold-up. This parameter is defined as the ratio of the flowing area occupied by liquid to the total area. Results obtained with CFD simulations showed that as the water rate increases, the liquid hold-up increases, implying a more effective liquid removal. Thus, it was concluded that the introduction of a swirler can help unload liquid from a gas well, although no investigation was carried out on the persistance of the swirl motion downstream of the device. For the third and final application, the erosion at pipe bends due to sand transport, the main focus was to check the erosion rate on the pipe wall with and without the introduction of a swirler. The erosion rate was predicted by CFD simulations. The flow that was investigated consisted of a liquid phase with solid particles suspended in it. The CFD results showed a significant reduction in erosion rate at the pipe walls when the swirler was introduced, which could translate into an extended working life for the pipe. An extensive literature review performed on this topic, complemented by the CFD simulations, showed the need for a dedicated multiphase test loop for the investigation of sand erosion in horizontal pipes and at bends. The design of a facility of this type is included in this thesis. The results obtained with this work are very encouraging and provide a broad perspective of applications of swirl flows and CFD for the oil and gas industry.

Ravuri Venkata Krish, Meher Surendra

2009-05-01T23:59:59.000Z

149

Impact of relative permeability models on fluid flow behavior for gas condensate reservoirs  

E-Print Network (OSTI)

Accurate assessments of reserves and evaluation of productivity trends for gas condensate systems depend on a basic understanding of phase and fluid flow behavior. In gas condensate reservoirs, the gas flow depends on liquid drop out at pressures below the dewpoint pressure. The liquid initially accumulates as a continuous film along the porous media because of the low interfacial tension. Then, as the volume of condensate increases, the interfacial tension increases and capillary forces become more important. Modeling fluid flow in these systems must consider the dependence of relative permeability on both viscous and capillary forces. This research focuses on the evaluation of several recently proposed relative permeability models and on the quantification of their impact on reservoir fluid flow and well performance. We selected three relative permeability models to compare the results obtained in the modeling of relative permeabilities for a published North Sea gas condensate reservoir. The models employ weighting factors to account for the interpolation between miscible and immiscible flow behavior. The Pusch model evaluated using Fevang's weighting factor gave the best estimation of relative permeability when compared to the published data. Using a sector model, we evaluated the effects at the field scale of the selected gas condensate relative permeability models on well performance under different geological heterogeneity and permeability anisotropy scenarios. The Bette and Pusch models as well as the Danesh model, as implemented in a commercial reservoir simulator, were used to quantify the impact of the relative permeability models on fluid-flow and well performance. The results showed that, if the transition between miscible and immiscible behavior is not considered, the condensate saturation could be overestimated and the condensate production could be underestimated. After twenty years of production, the heterogeneous model using the selected relative permeability models predicted between 7.5 - 13% more condensate recovery than was estimated using an immiscible relative permeability model. Using the same relative permeability models, the anisotropic model forecast between 3 - 10% more condensate recovery than predicted using an immiscible relative permeability model. Results using the anisotropic model showed that vertical communication could affect the liquid distribution in the reservoir.

Zapata Arango, Jose? Francisco

2002-01-01T23:59:59.000Z

150

Moving Character Observation of Bubble Rising in Vertical Gas?Liquid Two?Phase Flow  

Science Conference Proceedings (OSTI)

The study of bubble motion in water is a basic subject in gas?liquid two?phase flow research. A suit of visualized experimental device was designed and set up. Bubble rising in stagnant liquid in a vertical translucent rectangular tank was studied using the high?speed video system combined with digital image process methods. Several bubble parameters were calculated base on the processed images. Bubble track

H. Y. Wang; F. Dong

2010-01-01T23:59:59.000Z

151

Flow interaction in the combustor-diffusor system of industrial gas turbines  

SciTech Connect

This paper presents an experimental/computational study of cold flow in the combustor-diffuser system of industrial gas turbines to address issues relating to flow interactions and pressure losses in the pre- and dump diffusers. The present configuration with can annular combustors differs substantially from the aircraft engines which typically use a 360 degree annular combustor. Experiments were conducted in a one-third scale, annular 360-degree model using several can combustors equispaced around the turbine axis. A 3-D computational fluid dynamics analysis employing the multidomain procedure was performed to supplement the flow measurements. The measured data correlated well with the computations. The airflow in the dump diffuser adversely affected the prediffuser flow by causing it to accelerate in the outer region at the prediffuser exit. This phenomenon referred to as the sink-effect also caused a large fraction of the flow to bypass much of the dump diffuser and go directly from the prediffuser exit to the bypass air holes on the combustor casing, thereby, rendering the dump diffuser ineffective in diffusing the flow. The dump diffuser was occupied by a large recirculation region which dissipated the flow kinetic energy. Approximately 1.2 dynamic head at the prediffuser inlet was lost in the combustor-diffuser system; much of it in the dump diffuser where the fluid passed through the narrow gaps and pathways. Strong flow interactions in the combustor-diffuser system indicate the need for design modifications which could not be addressed by empirical correlations based on simple flow configurations.

Agrawal, A.K. [Univ. of Oklahoma, Norman, OK (United States); Kapat, J.S.; Yang, T. [Clemson Univ., SC (United States). Dept. of Mechanical Engineering

1996-05-01T23:59:59.000Z

152

Energy policy act transportation study: Interim report on natural gas flows and rates  

Science Conference Proceedings (OSTI)

This report, Energy Policy Act Transportation Study: Interim Report on Natural Gas Flows and Rates, is the second in a series mandated by Title XIII, Section 1340, ``Establishment of Data Base and Study of Transportation Rates,`` of the Energy Policy Act of 1992 (P.L. 102--486). The first report Energy Policy Act Transportation Study: Availability of Data and Studies, was submitted to Congress in October 1993; it summarized data and studies that could be used to address the impact of legislative and regulatory actions on natural gas transportation rates and flow patterns. The current report presents an interim analysis of natural gas transportation rates and distribution patterns for the period from 1988 through 1994. A third and final report addressing the transportation rates and flows through 1997 is due to Congress in October 2000. This analysis relies on currently available data; no new data collection effort was undertaken. The need for the collection of additional data on transportation rates will be further addressed after this report, in consultation with the Congress, industry representatives, and in other public forums.

NONE

1995-11-17T23:59:59.000Z

153

Measurement of Turbulent Flow Phenomena for the Lower Plenum of a Prismatic Gas-Cooled Reactor  

Science Conference Proceedings (OSTI)

Mean velocity field and turbulence data are presented that measure turbulent flow phenomena in an approximately 1:7 scale model of a region of the lower plenum of a typical prismatic gas-cooled reactor (GCR) similar to a General Atomics design (Gas-Turbine-Modular Helium Reactor). The datawere obtained in the Matched-Index-of-Refraction (MIR) facility at Idaho National Laboratory (INL) and are offered as a benchmark for assessing computational fluid dynamics (CFD) software. This experiment has been selected as the first Standard Problem endorsed by the Generation IV International Forum. The primary objective of this paper is to document the experiment and present a sample of the data set that has been established for this standard problem. Present results concentrate on the region of the lower plenum near its far reflector wall (away from the outlet duct). The flowin the lower plenum consists of multiple jets injected into a confined crossflowwith obstructions. The model consists of a row of full circular posts along its centerline with half-posts on the two parallel walls to approximate flow scaled to that expected from the staggered parallel rows of posts in the reactor design. Posts, side walls and end walls are fabricated from clear, fused quartz to match the refractive index of the mineral oil working fluid so that optical techniques may be employed for the measurements. The benefit of the MIR technique is that it permits optical measurements to determine flow characteristics in complex passages and around objects to be obtained without locating intrusive transducers that will disturb the flow field and without distortion of the optical paths. An advantage of the INL system is its large size, leading to improved spatial and temporal resolution compared to similar facilities at smaller scales. A three-dimensional (3D) particle image velocimetry (PIV) system was used to collect the data. Inlet-jet Reynolds numbers (based on the hydraulic diameter of the jet and the timemean average flow rate) are approximately 4300 and 12,400. Uncertainty analysis and a discussion of the standard problem are included. The measurements reveal complicated flow patterns that include several large recirculation zones, reverse flow near the simulated reflector wall, recirculation zones in the upper portion of the plenum and complex flow patterns around the support posts. Data include three-dimensional PIV images of flow planes, data displays along the coordinate planes (slices) and presentations that describe the component flows at specific regions in the model.

Hugh M. McIlroy, Jr.; Donald M. McEligot; Robert J. Pink

2010-02-01T23:59:59.000Z

154

Measurement of Flow Phenomena in a Lower Plenum Model of a Prismatic Gas-Cooled Reactor  

Science Conference Proceedings (OSTI)

Mean-velocity-field and turbulence data are presented that measure turbulent flow phenomena in an approximately 1:7 scale model of a region of the lower plenum of a typical prismatic gas-cooled reactor (GCR) similar to a General Atomics Gas-Turbine-Modular Helium Reactor (GTMHR) design. The data were obtained in the Matched-Index-of-Refraction (MIR) facility at Idaho National Laboratory (INL) and are offered for assessing computational fluid dynamics (CFD) software. This experiment has been selected as the first Standard Problem endorsed by the Generation IV International Forum. This paper reviews the experimental apparatus and procedures, presents a sample of the data set, and reviews the INL Standard Problem. Results concentrate on the region of the lower plenum near its far reflector wall (away from the outlet duct). The flow in the lower plenum consists of multiple jets injected into a confined cross flow - with obstructions. The model consists of a row of full circular posts along its centerline with half-posts on the two parallel walls to approximate flow scaled to that expected from the staggered parallel rows of posts in the reactor design. The model is fabricated from clear, fused quartz to match the refractive-index of the mineral oil working fluid so that optical techniques may be employed for the measurements. The benefit of the MIR technique is that it permits optical measurements to determine flow characteristics in complex passages in and around objects to be obtained without locating intrusive transducers that will disturb the flow field and without distortion of the optical paths. An advantage of the INL system is its large size, leading to improved spatial and temporal resolution compared to similar facilities at smaller scales. A three-dimensional (3-D) Particle Image Velocimetry (PIV) system was used to collect the data. Inlet jet Reynolds numbers (based on the jet diameter and the time-mean average flow rate) are approximately 4,300 and 12,400. Uncertainty analysis and a discussion of the standard problem are included. The measurements reveal undeveloped, non-uniform, turbulent flow in the inlet jets and complicated flow patterns in the model lower plenum. Data include three-dimensional vector plots, data displays along the coordinate planes (slices) and presentations that describe the component flows at specific regions in the model. Information on inlet conditions are also presented.

Hugh M. McIlroy, Jr.; Donald M. McEligot; Robert J. Pink

2008-05-01T23:59:59.000Z

155

Casting Flow Chart  

Science Conference Proceedings (OSTI)

Figure: ...Fig. 1 Simplified flow diagram of the basic operations for producing a steel casting. Similar diagrams can be applied to other ferrous and nonferrous alloys produced by sand

156

Fracture Modeling and Flow Behavior in Shale Gas Reservoirs Using Discrete Fracture Networks  

E-Print Network (OSTI)

Fluid flow process in fractured reservoirs is controlled primarily by the connectivity of fractures. The presence of fractures in these reservoirs significantly affects the mechanism of fluid flow. They have led to problems in the reservoir which results in early water breakthroughs, reduced tertiary recovery efficiency due to channeling of injected gas or fluids, dynamic calculations of recoverable hydrocarbons that are much less than static mass balance ones due to reservoir compartmentalization, and dramatic production changes due to changes in reservoir pressure as fractures close down as conduits. These often lead to reduced ultimate recoveries or higher production costs. Generally, modeling flow behavior and mass transport in fractured porous media is done using the dual-continuum concept in which fracture and matrix are modeled as two separate kinds of continua occupying the same control volume (element) in space. This type of numerical model cannot reproduce many commonly observed types of fractured reservoir behavior since they do not explicitly model the geometry of discrete fractures, solution features, and bedding that control flow pathway geometry. This inaccurate model of discrete feature connectivity results in inaccurate flow predictions in areas of the reservoir where there is not good well control. Discrete Fracture Networks (DFN) model has been developed to aid is solving some of these problems experienced by using the dual continuum models. The Discrete Fracture Networks (DFN) approach involves analysis and modeling which explicitly incorporates the geometry and properties of discrete features as a central component controlling flow and transport. DFN are stochastic models of fracture architecture that incorporate statistical scaling rules derived from analysis of fracture length, height, spacing, orientation, and aperture. This study is focused on developing a methodology for application of DFN to a shale gas reservoir and the practical application of DFN simulator (FracGen and NFflow) for fracture modeling of a shale gas reservoir and also studies the interaction of the different fracture properties on reservoir response. The most important results of the study are that a uniform fracture network distribution and fracture aperture produces the highest cumulative gas production for the different fracture networks and fracture/well properties considered.

Ogbechie, Joachim Nwabunwanne

2011-12-01T23:59:59.000Z

157

High-Resolution Simulations of Gas-Solids Jet Penetration Into a High Density Riser Flow  

SciTech Connect

High-resolution simulations of a gas-solids jet in a 0.3 m diameter and 15.9 m tall circulating fluidized bed (CFB) riser were conducted with the open source software-MFIX. In the numerical simulations, both gas and solids injected through a 1.6 cm diameter radial-directed tube 4.3 m above the bottom distributor were tracked as tracers, which enable the analysis of the characteristics of a two-phase jet. Two jetting gas velocities of 16.6 and 37.2 m/s were studied with the other operating conditions fixed. Reasonable flow hydrodynamics with respect to overall pressure drop, voidage, and solids velocity distributions were predicted. Due to the different dynamic responses of gas and particles to the crossflow, a significant separation of gas and solids within the jet region was predicted for both cases. In addition, the jet characteristics based on tracer concentration and tracer mass fraction profiles at different downstream levels are discussed. Overall, the numerical predictions compare favorably to the experimental measurements made at NETL.

Li, Tingwen

2011-05-01T23:59:59.000Z

158

Numerical simulations of the Macondo well blowout reveal strong control of oil flow by reservoir permeability and exsolution of gas  

E-Print Network (OSTI)

released from the BP oil well blowout, Nature Geoscience, 4:for the Deepwater Horizon /Macondo Well oil spill. Flow Ratecolumn of oil and gas in the well, it would imply the

Oldenburg, C.M.

2013-01-01T23:59:59.000Z

159

Gas-liquid two phase flow through a vertical 90 elbow bend  

SciTech Connect

Pressure drop data are reported for two phase air-water flow through a vertical to horizontal 90 elbow bend set in 0.026 m i.d. pipe. The pressure drop in the vertical inlet tangent showed some significant differences to that found for straight vertical pipe. This was caused by the elbow bend partially choking the inflow resulting in a build-up of pressure and liquid in the vertical inlet riser and differences in the structure of the flow regimes when compared to the straight vertical pipe. The horizontal outlet tangent by contrast gave data in general agreement with literature even to exhibiting a drag reduction region at low liquid rates and gas velocities between 1 and 2 m s{sup -1}. The elbow bend pressure drop was best correlated in terms of l{sub e}/d determined using the actual pressure loss in the inlet vertical riser. The data showed a general increase with fluid rates that tapered off at high fluid rates and exhibited a negative pressure region at low rates. The latter was attributed to the flow being smoothly accommodated by the bend when it passed from slug flow in the riser to smooth stratified flow in the outlet tangent. A general correlation was presented for the elbow bend pressure drop in terms of total Reynolds numbers. A modified Lockhart-Martinelli model gave prediction of the data. (author)

Spedding, P.L.; Benard, E. [School of Aeronautical Engineering, Queen's University Belfast, BT9 5AH (United Kingdom)

2007-07-15T23:59:59.000Z

160

Design and Initial Development of Monolithic Cross-Flow Ceramic Hot-Gas Filters  

SciTech Connect

Advanced, coal-fueled, power generation systems utilizing pressurized fluidized bed combustion (PFBC) and integrated gasification combined cycle (IGCC) technologies are currently being developed for high-efficiency, low emissions, and low-cost power generation. In spite of the advantages of these promising technologies, the severe operating environment often leads to material degradation and loss of performance in the barrier filters used for particle entrapment. To address this problem, LoTEC Inc., and Oak Ridge National Laboratory are jointly designing and developing a monolithic cross-flow ceramic hot-gas filter. The filter concept involves a truly monolithic cross-flow design that is resistant to delamination, can be easily fabricated, and offers flexibility of geometry and material make-up. During Phase I of the program, a thermo-mechanical analysis was performed to determine how a cross-flow filter would respond both thermally and mechanically to a series of thermal and mechanical loads. The cross-flow filter mold was designed accordingly, and the materials selection was narrowed down to Ca{sub 0.5}Sr{sub 0.5}Zr{sub 4}P{sub 6}O{sub 24} (CS-50) and 2Al{sub 2}O{sub 3}-3SiO{sub 2} (mullite). A fabrication process was developed using gelcasting technology and monolithic cross-flow filters were fabricated. The program focuses on obtaining optimum filter permeability and testing the corrosion resistance of the candidate materials.

Barra, C.; Limaye, S.; Stinton, D.P.; Vaubert, V.M.

1999-06-06T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Load diagram for a perforated plate tray  

E-Print Network (OSTI)

1 decimals noggrannhet c. Upprita i x,y-diagrammet q-linjen och bestäm (grafiskt, eller med must be produced. The feed stream F is a saturated liquid, i.e. q = 1, while the reflux ratio R = 1Load diagram for a perforated plate tray vG, vL: velocities G, L: densities QL, QG: volume flows H

Zevenhoven, Ron

162

COARSE-GRID SIMULATION OF REACTING AND NON-REACTING GAS-PARTICLE FLOWS  

SciTech Connect

Many processes involved in coal utilization involve handling of fine particles, their pneumatic transport, and their reactions in fluidized beds, spouted beds and circulating fluidized beds. One of the factors limiting our ability to simulate these processes is the hydrodynamics encountered in them. Two major issues that contribute to this limitation are lack of good and computationally expedient models for frictional interaction between particles, and models to capture the consequences of mesoscale structures that are ubiquitous in gas-solid flows. This project has focused on the development of these models through a combination of computer simulations and experiments. The principal goal of this project, funded under the ''DOE Vision 21 Virtual Demonstration Initiative'' is better simulation of circulating fluidized bed performance. The principal challenge funded through this cooperative agreement is to devise sound physical models for the rheological characteristics of the gas-particle mixtures and implement them in the open-domain CFD code MFIX. During the course of this project, we have made the following specific advances. (a) We have demonstrated unequivocally that sub-grid models are essential to capture, even qualitatively correctly, the macroscale flow structures in gas-particle flows in vertical risers. To this end, we developed sub-grid models of different levels of detail and exposed the sensitivity of the results obtained in coarse-grid simulations of gas-particle flow in a riser to the level of sophistication of the sub-grid models. (b) We have demonstrated that sub-grid model for the fluid-particle drag force is the most important additional feature and that the corrections for the granular phase viscosity and pressure are of secondary importance. We have also established that sub-grid models for dispersion of heat and mass are of secondary importance only. (c) We have brought forth the general character of the sub-grid model for the drag force. (d) We have performed for the first time in the literature a detailed analysis of the impact of unipolar electrostatic charges on gas-particle flow characteristics in a riser. (e) We have examined in detail the effect of wall friction and particle-particle contact (frictional) stresses on fluidization and defluidization behavior of particle assemblies, and brought forth their importance for stable operation of standpipes in a circulating fluidized bed circuit. (f) We have demonstrated that the general characteristics of contact stresses in particle assemblies and wall friction are similar for many different particles, establishing that a simple model framework can be widely applicable. (g) We have developed constitutive models for frictional regime, implemented them in MFIX and demonstrated the capability of simulating dense gas-solid flows in the frictional regime. (h) We have also performed detailed experiments to expose the nature of the stick-slip flows in silos, as a simple model system for under-aerated standpipes. All theoretical advances made in the study are implemented in MFIX and are available for public use.

Sankaran Sundaresan

2004-10-01T23:59:59.000Z

163

Preliminary Study of Turbulent Flow in the Lower Plenum of a Gas-Cooled Reactor  

Science Conference Proceedings (OSTI)

A preliminary study of the turbulent flow in a scaled model of a portion of the lower plenum of a gas-cooled advanced reactor concept has been conducted. The reactor is configured such that hot gases at various temperatures exit the coolant channels in the reactor core, where they empty into a lower plenum and mix together with a crossflow past vertical cylindrical support columns, then exit through an outlet duct. An accurate assessment of the flow behavior will be necessary prior to final design to ensure that material structural limits are not exceeded. In this work, an idealized model was created to mimic a region of the lower plenum for a simplified set of conditions that enabled the flow to be treated as an isothermal, incompressible fluid with constant properties. This is a first step towards assessing complex thermal fluid phenomena in advanced reactor designs. Once such flows can be computed with confidence, heated flows will be examined. Experimental data was obtained using three-dimensional Particle Image Velocimetry (PIV) to obtain non-intrusive flow measurements for an unheated geometry. Computational fluid dynamic (CFD) predictions of the flow were made using a commercial CFD code and compared to the experimental data. The work presented here is intended to be scoping in nature, since the purpose of this work is to identify improvements that can be made to subsequent computations and experiments. Rigorous validation of computational predictions will eventually be necessary for design and analysis of new reactor concepts, as well as for safety analysis and licensing calculations.

T. Gallaway; D.P. Guillen; H.M. McIlroy, Jr.; S.P. Antal

2007-09-01T23:59:59.000Z

164

Measurement of Flow Phenomena in a Lower Plenum Model of a Prismatic Gas-Cooled Reactor  

Science Conference Proceedings (OSTI)

Mean-velocity-field and turbulence data are presented that measure turbulent flow phenomena in an approximately 1:7 scale model of a region of the lower plenum of a typical prismatic gas-cooled reactor (GCR) similar to a General Atomics Gas-Turbine-Modular Helium Reactor (GTMHR) design. The data were obtained in the Matched-Index-of-Refraction (MIR) facility at Idaho National Laboratory (INL) and are offered for assessing computational fluid dynamics (CFD) software. This experiment has been selected as the first Standard Problem endorsed by the Generation IV International Forum. Results concentrate on the region of the lower plenum near its far reflector wall (away from the outlet duct). The flow in the lower plenum consists of multiple jets injected into a confined cross flow - with obstructions. The model consists of a row of full circular posts along its centerline with half-posts on the two parallel walls to approximate geometry scaled to that expected from the staggered parallel rows of posts in the reactor design. The model is fabricated from clear, fused quartz to match the refractive-index of the working fluid so that optical techniques may be employed for the measurements. The benefit of the MIR technique is that it permits optical measurements to determine flow characteristics in complex passages in and around objects to be obtained without locating intrusive transducers that will disturb the flow field and without distortion of the optical paths. An advantage of the INL system is its large size, leading to improved spatial and temporal resolution compared to similar facilities at smaller scales. A three-dimensional (3-D) Particle Image Velocimetry (PIV) system was used to collect the data. Inlet jet Reynolds numbers (based on the jet diameter and the time-mean bulk velocity) are approximately 4,300 and 12,400. Uncertainty analyses and a discussion of the standard problem are included. The measurements reveal developing, non-uniform, turbulent flow in the inlet jets and complicated flow patterns in the model lower plenum. Data include three-dimensional vector plots, data displays along the coordinate planes (slices) and presentations that describe the component flows at specific regions in the model. Information on inlet conditions is also presented.

Hugh M. McIlroy, Jr.; Doanld M. McEligot; Robert J. Pink

2010-02-01T23:59:59.000Z

165

Production of Natural Gas and Fluid Flow in Tight Sand Reservoirs  

Science Conference Proceedings (OSTI)

This document reports progress of this research effort in identifying possible relationships and defining dependencies between macroscopic reservoir parameters strongly affected by microscopic flow dynamics and production well performance in tight gas sand reservoirs. Based on a critical review of the available literature, a better understanding of the main weaknesses of the current state of the art of modeling and simulation for tight sand reservoirs has been reached. Progress has been made in the development and implementation of a simple reservoir simulator that is still able to overcome some of the deficiencies detected. The simulator will be used to quantify the impact of microscopic phenomena in the macroscopic behavior of tight sand gas reservoirs. Phenomena such as, Knudsen diffusion, electro-kinetic effects, ordinary diffusion mechanisms and water vaporization are being considered as part of this study. To date, the adequate modeling of gas slippage in porous media has been determined to be of great relevance in order to explain unexpected fluid flow behavior in tight sand reservoirs.

Maria Cecilia Bravo; Mariano Gurfinkel

2005-06-30T23:59:59.000Z

166

CFD Simulation of 3D Flow field in a Gas Centrifuge  

SciTech Connect

A CFD method was used to study the whole flow field in a gas centrifuge. In this paper, the VSM (Vector Splitting Method) of the FVM (Finite Volume Method) was used to solve the 3D Navier-Stokes equations. An implicit second-order upwind scheme was adopted. The numerical simulation was successfully performed on a parallel cluster computer and a convergence result was obtained. The simulation shows that: in the withdrawal chamber, a strong detached shock wave is formed in front of the scoop; as the radial position increases, the shock becomes stronger and the distance to scoop front surface is smaller. An oblique shock forms in the clearance between the scoop and the centrifuge wall; behind the shock-wave, the radially-inward motion of gas is induced because of the imbalance of the pressure gradient and the centrifugal force. In the separation chamber, a countercurrent is introduced. This indicates that CFD method can be used to study the complex three-dimensional flow field of gas centrifuges. (authors)

Dongjun Jiang; Shi Zeng [Tsinghua University, Beijing, 100084 (China)

2006-07-01T23:59:59.000Z

167

A two-mesh coupled gas flow-solid interaction model for 2D blast analysis in fractured media  

Science Conference Proceedings (OSTI)

A 2D coupled two-mesh interaction model for blast gas flow through fractured and fragmented solid media is presented. It is mainly designed to solve blast problems where a complicated set of wide difficult phenomena are involved: shock waves, progressive ... Keywords: Blast, Combined finite/discrete element method, Cracking, Explosion, Fragmentation, Gas-solid interaction

S. Mohammadi; A. Pooladi

2012-03-01T23:59:59.000Z

168

Controlling fuel and diluent gas flow for a diesel engine operating in the fuel rich low-temperature-combustion mode  

E-Print Network (OSTI)

The flow of a diluent gas supplied to a motoring engine was controlled at a diluent to air mass flow ratios of 10%, 30%, 50%, and 70%. This arrangement was a significant set up for running the engine in the Low-Temperature ...

Lopez, David M

2007-01-01T23:59:59.000Z

169

Gas-liquid two-phase flow across a bank of micropillars Santosh Krishnamurthy and Yoav Peles  

E-Print Network (OSTI)

densitometry8­10 have been successfully used to measure the void fraction, while in previous micro- channel studies14,15,17 image processing was used. These studies compared the measured void fraction to the homoge the homogeneous void fraction overpredicts the measured value even at low gas flow rates. C. Flow pattern Several

Peles, Yoav

170

Characterization of the reactive flow field dynamics in a gas turbine injector using high frequency PIV  

E-Print Network (OSTI)

The present work details the analysis of the aerodynamics of an experimental swirl stabilized burner representative of gas turbine combustors. This analysis is carried out using High Frequency PIV (HFPIV) measurements in a reactive situation. While this information is usually available at a rather low rate, temporally resolved PIV measurements are necessary to better understand highly turbulent swirled flows, which are unsteady by nature. Thanks to recent technical improvements, a PIV system working at 12 kHz has been developed to study this experimental combustor flow field. Statistical quantities of the burner are first obtained and analyzed, and the measurement quality is checked, then a temporal analysis of the velocity field is carried out, indicating that large coherent structures periodically appear in the combustion chamber. The frequency of these structures is very close to the quarter wave mode of the chamber, giving a possible explanation for combustion instability coupling.

Barbosa, Sverine; Ducruix, Sbastien

2008-01-01T23:59:59.000Z

171

A nozzle array and ballast resistance for producing a glow discharge in a gas flow  

SciTech Connect

This paper describes a design for a nozzle-anode array equipped with a system of cathodes fitted at the axis of each nozzle together with liquid ballast resistors. The system is designed to produce a glow discharge in a supersonic gas flow. The circuit resistance is adjusted via the contact area between the electrode and the liquid. The nominal values of the resistances can be varied over the range 10/sup 1/-10/sup 4/..cap omega.., or set values can be produced with an accuracy of + or - 2%.

Alferov, V.I.; Bushmin, A.S.; Dmitriev, L.M.

1985-01-01T23:59:59.000Z

172

Source modulation-correlation measurement for fissile mass flow in gas or liquid fissile streams  

SciTech Connect

The method of monitoring fissile mass flow on all three legs of a blending point, where the input is high-enriched uranium (HEU) and low-enriched uranium (LEU) and the product is PEU, can yield the fissile stream velocity and, with calibration, the [sup235]U content. The product of velocity and content integrated over the pipe gives the fissile mass flow in each leg. Also, the ratio of fissile contents in each pipe: HEU/LEU, HEU/PEU, and PEU/LEU, are obtained. By modulating the source on the input HEU pipe differently from that on the output pipe, the HEU gas can be tracked through the blend point. This method can be useful for monitoring flow velocity, fissile content, and fissile mass flow in HEU blenddown of UF[sub 6] if the pressures are high enough to contain some of the induced fission products. This method can also be used to monitor transfer of fissile liquids and other gases and liquids that emit radiation delayed from particle capture. These preliminary experiments with the Oak Ridge apparatus show that the method will work and the modeling is adequate.

Mihalczo, J.T.; March-Leuba, J.A.; Valentine, T.E.; Abston, R.A.; Mattingly, J.K.; Mullens, J.A.

1996-09-01T23:59:59.000Z

173

A phenomenological model for rarefied gas flows in thin film slider bearings  

E-Print Network (OSTI)

We analyze rarefied gas flows in lubricating films that form between the read/write head and rotating recording medium in computer hard drives. A modified slip-corrected Reynolds lubrication equation is derived for arbitrary Knudsen numbers using the Navier-Stokes equation with consistent slip boundary conditions and modified physical coefficients. In particular, we present results of velocity profiles, pressure distribution and load capacity for various slider bearing configurations. An empirical model for the velocity distribution is developed by studying the Poiseuille and Couette flow components of the lubricating film. Important lubrication characteristics such as the pressure distribution and load capacity are obtained directly from numerical solutions of the modified Reynolds equation. In addition, we outline a method to accurately predict the shear drag forces induced by air resistance to the track-access-motion of the sliders. The new model is validated by comparisons with numerical solutions of the generalized lubrication equation based on the two-dimensional linearized Boltzmann equation and Direct Simulation Monte Carlo (DSMC) results available in the literature. The model predicts the velocity profiles, pressure distribution, load capacity and skin friction with good accuracy for a wide range of Knudsen numbers for low subsonic compressible flows. However it exhibits some physical limitations in the free molecular flow regime, due to its use of a Poiseuille flowrate database obtained via the solution of a two- dimensional Boltzmann equation.

Bahukudumbi, Pradipkumar

2002-01-01T23:59:59.000Z

174

Fundamentals of Natural Gas and Species Flows from Hydrate Dissociation - Applications to Safety and Sea Floor Instability  

SciTech Connect

Semi-analytical computational models for natural gas flow in hydrate reservoirs were developed and the effects of variations in porosity and permeability on pressure and temperature profiles and the movement of a dissociation front were studied. Experimental data for variations of gas pressure and temperature during propane hydrate formation and dissociation for crushed ice and mixture of crushed ice and glass beads under laboratory environment were obtained. A thermodynamically consistent model for multiphase liquid-gas flows trough porous media was developed. Numerical models for hydrate dissociation process in one dimensional and axisymmetric reservoir were performed. The computational model solved the general governing equations without the need for linearization. A detail module for multidimensional analysis of hydrate dissociation which make use of the FLUENT code was developed. The new model accounts for gas and liquid water flow and uses the Kim-Boshnoi model for hydrate dissociation.

Goodarz Ahmadi

2006-09-30T23:59:59.000Z

175

Effects of flow rate, gas type and disease status on the welfare of sucking and weaned pigs during gas euthanasia.  

E-Print Network (OSTI)

??Gas euthanasia of swine on farms is increasingly common. However, there is controversy regarding pig welfare during gas euthanasia and research must be conducted to (more)

Sadler, Larry Joseph

2013-01-01T23:59:59.000Z

176

Another View of Phase Diagrams  

Science Conference Proceedings (OSTI)

On 2D phase fraction charts these are lines where the fraction equals one. However another type of diagram can be drawn using lines where the phase fraction...

177

Bibliographic notes on Voronoi diagrams  

Science Conference Proceedings (OSTI)

... 4. F. Aurenhammer, Power diagrams: properties, algorithms and ... in the discrete universe of grid points in the ... and by reflecting each extension in the ...

178

Flow Mapping in a Gas-Solid Riser via Computer Automated Radioactive Particle Tracking (CARPT)  

SciTech Connect

Statement of the Problem: Developing and disseminating a general and experimentally validated model for turbulent multiphase fluid dynamics suitable for engineering design purposes in industrial scale applications of riser reactors and pneumatic conveying, require collecting reliable data on solids trajectories, velocities ? averaged and instantaneous, solids holdup distribution and solids fluxes in the riser as a function of operating conditions. Such data are currently not available on the same system. Multiphase Fluid Dynamics Research Consortium (MFDRC) was established to address these issues on a chosen example of circulating fluidized bed (CFB) reactor, which is widely used in petroleum and chemical industry including coal combustion. This project addresses the problem of lacking reliable data to advance CFB technology. Project Objectives: The objective of this project is to advance the understanding of the solids flow pattern and mixing in a well-developed flow region of a gas-solid riser, operated at different gas flow rates and solids loading using the state-of-the-art non-intrusive measurements. This work creates an insight and reliable database for local solids fluid-dynamic quantities in a pilot-plant scale CFB, which can then be used to validate/develop phenomenological models for the riser. This study also attempts to provide benchmark data for validation of Computational Fluid Dynamic (CFD) codes and their current closures. Technical Approach: Non-Invasive Computer Automated Radioactive Particle Tracking (CARPT) technique provides complete Eulerian solids flow field (time average velocity map and various turbulence parameters such as the Reynolds stresses, turbulent kinetic energy, and eddy diffusivities). It also gives directly the Lagrangian information of solids flow and yields the true solids residence time distribution (RTD). Another radiation based technique, Computed Tomography (CT) yields detailed time averaged local holdup profiles at various planes. Together, these two techniques can provide the needed local solids flow dynamic information for the same setup under identical operating conditions, and the data obtained can be used as a benchmark for development, and refinement of the appropriate riser models. For the above reasons these two techniques were implemented in this study on a fully developed section of the riser. To derive the global mixing information in the riser, accurate solids RTD is needed and was obtained by monitoring the entry and exit of a single radioactive tracer. Other global parameters such as Cycle Time Distribution (CTD), overall solids holdup in the riser, solids recycle percentage at the bottom section of the riser were evaluated from different solids travel time distributions. Besides, to measure accurately and in-situ the overall solids mass flux, a novel method was applied.

Muthanna Al-Dahhan; Milorad P. Dudukovic; Satish Bhusarapu; Timothy J. O'hern; Steven Trujillo; Michael R. Prairie

2005-06-04T23:59:59.000Z

179

Numerical simulation of flow distribution for pebble bed high temperature gas cooled reactors  

E-Print Network (OSTI)

The premise of the work presented here is to use a common analytical tool, Computational Fluid dynamics (CFD), along with a difference turbulence models. Eddy viscosity models as well as state-of-the-art Large Eddy Simulation (LES) were used to study the flow past bluff bodies. A suitable CFD code (CFX5.6b) was selected and implemented. Simulation of turbulent transport for the gas through the gaps of the randomly distributed spherical fuel elements (pebbles) was performed. Although there are a number of numerical studies () on flows around spherical bodies, none of them use the necessary turbulence models that are required to simulate flow where strong separation exists. With the development of high performance computers built for applications that require high CPU time and memory; numerical simulation becomes one of the more effective approaches for such investigations and LES type of turbulence models can be used more effectively. Since there are objects that are touching each other in the present study, a special approach was applied at the stage of building computational domain. This is supposed to be a considerable improvement for CFD applications. Zero thickness was achieved between the pebbles in which fission reaction takes place. Since there is a strong pressure gradient as a result of high Reynolds Number on the computational domain, which strongly affects the boundary layer behavior, heat transfer in both laminar and turbulent flows varies noticeably. Therefore, noncircular curved flows as in the pebble-bed situatio n, in detailed local sense, is interesting to be investigated. Since a compromise is needed between accuracy of results and time/cost of effort in acquiring the results numerically, selection of turbulence model should be done carefully. Resolving all the scales of a turbulent flow is too costly, while employing highly empirical turbulence models to complex problems could give inaccurate simulation results. The Large Eddy Simulation (LES) method would achieve the requirements to obtain a reasonable result. In LES, the large scales in the flow are solved and the small scales are modeled. Eddy viscosity and Reynolds stress models were also be used to investigate the applicability of these models for this kind of flow past bluff bodies at high Re numbers.

Yesilyurt, Gokhan

2006-05-01T23:59:59.000Z

180

Investigation of the Heat Transfer Coefficient of Liquid and Gas Bubble Train Flow in a Square Mini-channel Using Infra-Red thermography  

E-Print Network (OSTI)

Investigation of the Heat Transfer Coefficient of Liquid and Gas Bubble Train Flow in a Square Mini slug and bubbles, liquid and gas superficial velocities which depend on the volume flow ratio of the channel (Bo) for specific liquid and gas phase. At relatively high Bo (Bo>Bocr1.835) systems gravity force

Khandekar, Sameer

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Improving the accuracy of flow units prediction through two committee machine models: An example from the South Pars Gas Field, Persian Gulf Basin, Iran  

Science Conference Proceedings (OSTI)

Intelligent reservoir characterization is a prerequisite study for development of oil and gas fields. Hydraulic flow units are mappable portions of hydrocarbon-bearing rocks that control fluid flow, and their modeling allows an accurate understanding ... Keywords: Committee machine, Flow units, Fuzzy logic, Genetic algorithm, Iran, Neural network, Neuro-fuzzy, South Pars Gas Field

Javad Ghiasi-Freez; Ali Kadkhodaie-Ilkhchi; Mansur Ziaii

2012-09-01T23:59:59.000Z

182

Two phase partially miscible flow and transport modeling in porous media: application to gas migration in a nuclear waste repository  

E-Print Network (OSTI)

We derive a compositional compressible two-phase, liquid and gas, flow model for numerical simulations of hydrogen migration in deep geological repository for radioactive waste. This model includes capillary effects and the gas high diffusivity. Moreover, it is written in variables (total hydrogen mass density and liquid pressure) chosen in order to be consistent with gas appearance or disappearance. We discuss the well possedness of this model and give some computational evidences of its adequacy to simulate gas generation in a water saturated repository.

Alain Bourgeat; Mladen Jurak; Farid Sma

2008-02-29T23:59:59.000Z

183

Development of the T+M coupled flow-geomechanical simulator to describe fracture propagation and coupled flow-thermal-geomechanical processes in tight/shale gas systems  

Science Conference Proceedings (OSTI)

We developed a hydraulic fracturing simulator by coupling a flow simulator to a geomechanics code, namely T+M simulator. Modeling of the vertical fracture development involves continuous updating of the boundary conditions and of the data connectivity, ... Keywords: Double porosity, Fracture propagation, Hydraulic fracturing, Poromechanics, Shale gas, Tensile failure

Jihoon Kim, George J. Moridis

2013-10-01T23:59:59.000Z

184

Formal interpreters for diagram notations  

Science Conference Proceedings (OSTI)

The article proposes an approach for defining extensible and flexible formal interpreters for diagram notations with significant dynamic semantics. More precisely, it addresses semi-formal diagram notations that have precisely-defined syntax, but informally ... Keywords: Semi-formal notations, graph transformation, high-level Petri nets, semantics

Luciano Baresi; Mauro Pezz

2005-01-01T23:59:59.000Z

185

Numerical Modeling of Reactive Multiphase Flow for FCC and Hot Gas Desulfurization Circulating Fluidized Beds  

Science Conference Proceedings (OSTI)

This work was carried out to understand the behavior of the solid and gas phases in a CFB riser. Only the riser is modeled as a straight pipe. A model with linear algebraic approximation to solids viscosity of the form, {musubs} = 5.34{epsisubs}, ({espisubs} is the solids volume fraction) with an appropriate boundary condition at the wall obtained by approximate momentum balance solution at the wall to acount for the solids recirculation is tested against experimental results. The work done was to predict the flow patterns in the CFB risers from available experimental data, including data from a 7.5-cm-ID CFB riser at the Illinois Institute of Technology and data from a 20.0-cm-ID CFB riser at the Particulate Solid Research, Inc., facility. This research aims at modeling the removal of hydrogen sulfide from hot coal gas using zinc oxide as the sorbent in a circulating fluidized bed and in the process indentifying the parameters that affect the performance of the sulfidation reactor. Two different gas-solid reaction models, the unreacted shrinking core (USC) and the grain model were applied to take into account chemical reaction resistances. Also two different approaches were used to affect the hydrodynamics of the process streams. The first model takes into account the effect of micro-scale particle clustering by adjusting the gas-particle drag law and the second one assumes a turbulent core with pseudo-steady state boundary condition at the wall. A comparison is made with experimental results.

None

2005-07-01T23:59:59.000Z

186

Pore-scale mechanisms of gas flow in tight sand reservoirs  

E-Print Network (OSTI)

adjacent fractures. Natural gas composition consists mostlyNatural gas is called wet or dry depending on how large is the lique?able portion of gas composition.

Silin, D.

2011-01-01T23:59:59.000Z

187

Pore-scale mechanisms of gas flow in tight sand reservoirs  

E-Print Network (OSTI)

include tight gas sands, gas shales, and coal-bed methane.Figure 3. Although the gas-shale production grows at a

Silin, D.

2011-01-01T23:59:59.000Z

188

Pore-scale characterization and modeling of two-phase flow in tight gas sandstones.  

E-Print Network (OSTI)

??Unconventional natural gas resources, particularly tight gas sands, constitute a significant percentage of the natural gas resource base and offer abundant potential for future reserves (more)

Mousavi, Maryam Alsadat

2011-01-01T23:59:59.000Z

189

Mass flow rate measurements in gas-liquid flows by means of a venturi or orifice plate coupled to a void fraction sensor  

SciTech Connect

Two-phase flow measurements were carried out using a resistive void fraction meter coupled to a venturi or orifice plate. The measurement system used to estimate the liquid and gas mass flow rates was evaluated using an air-water experimental facility. Experiments included upward vertical and horizontal flow, annular, bubbly, churn and slug patterns, void fraction ranging from 2% to 85%, water flow rate up to 4000 kg/h, air flow rate up to 50 kg/h, and quality up to almost 10%. The fractional root mean square (RMS) deviation of the two-phase mass flow rate in upward vertical flow through a venturi plate is 6.8% using the correlation of Chisholm (D. Chisholm, Pressure gradients during the flow of incompressible two-phase mixtures through pipes, venturis and orifice plates, British Chemical Engineering 12 (9) (1967) 454-457). For the orifice plate, the RMS deviation of the vertical flow is 5.5% using the correlation of Zhang et al. (H.J. Zhang, W.T. Yue, Z.Y. Huang, Investigation of oil-air two-phase mass flow rate measurement using venturi and void fraction sensor, Journal of Zhejiang University Science 6A (6) (2005) 601-606). The results show that the flow direction has no significant influence on the meters in relation to the pressure drop in the experimental operation range. Quality and slip ratio analyses were also performed. The results show a mean slip ratio lower than 1.1, when bubbly and slug flow patterns are encountered for mean void fractions lower than 70%. (author)

Oliveira, Jorge Luiz Goes; Passos, Julio Cesar [Departamento de Engenharia Mecanica-LEPTEN/Boiling-UFSC, Campus Universitario, Trindade, 88.040-900 Florianopolis-SC (Brazil); Verschaeren, Ruud; Geld, Cees van der [Eindhoven University of Technology, Faculty of Mechanical Engineering, W-hoog 2.135, P.O. Box 513, 5600 MB, Eindhoven (Netherlands)

2009-01-15T23:59:59.000Z

190

Influence of gas flow rate on liquid distribution in trickle-beds using perforated plates as liquid distributors  

E-Print Network (OSTI)

Two wire mesh tomography devices and a liquid collector were used to study the influence of the gas flow rate on liquid distribution when fluids distribution on top of the reactor is ensured by a perforated plate. In opposition to most of the studies realized by other authors, conditions in which the gas has a negative impact in liquid distribution were evidenced. Indeed, the obtained results show that the influence of gas flow rate depends on the quality of the initial distribution, as the gas forces the liquid to "respect" the distribution imposed at the top of the reactor. Finally, a comparison between the two measuring techniques shows the limitations of the liquid collector and the improper conclusions to which its use could lead.

Llamas, Juan-David; Wild, Gabriel

2008-01-01T23:59:59.000Z

191

Adsorption studies of gases on Pt-Rh bimetallic catalysts by reversed-flow gas chromatography  

SciTech Connect

In the present work, the relatively new technique of reversed-flow gas chromatography was applied for the study of adsorption of carbon monoxide, oxygen, and carbon dioxide on Pt-Rh bimetallic catalysts. Using suitable mathematical analysis, equations were derived by means of which rate constants for adsorption, desorption, and disproportionation reaction were calculated. From the variation of these rate constants with temperature and the nature of the catalyst (Pt content), as well as from the finding that the CO adsorption is a dissociative process, useful conclusions concerning the mechanism for the CO oxidation reaction over Pt-Rh bimetallic catalysts were extracted. The catalytic fractional conversions for the CO disproportionation reaction were found to be higher for the Pt-RH bimetallic catalysts than those for the pure Pt catalyst, indicating the presence of beneficial Pt-Rh synergism.

Gavril, D.; Koliadima, A.; Karaiskakis, G. [Univ. of Patras (Greece). Dept. of Chemistry

1999-05-25T23:59:59.000Z

192

A plant kinetic study of alcoholic fermentation using reversed-flow gas chromatography  

SciTech Connect

The reversed-flow gas chromatographic sampling technique is used to study the kinetics of alcoholic fermentation in a factory in conjunction with measurements of suspended particles in the fermenting medium. It was found that the overall process consists of four phases which have different first-order rate constants during ethanol formation. The second phase is the slowest with its rate constant being 4.3 and 13 times smaller than that of the first and third phases, respectively. There is also a decrease of suspended particles during the second phase. These results show that there is the possibility of increasing the rate constant during this phase, thereby increasing the overall production rate of ethanol significantly and thus lowering its cost of production.

Economopoulos, N.; Athanassopoulos, N. (B.G. Spiliopoulos Distilleri S.A., Patras (Greece)); Katsanos, N.A.; Karaiskakis, G.; Agathonos, P.; Vassilakos, Ch. (Univ. of Patras (Greece))

1992-12-01T23:59:59.000Z

193

Convergence of a Finite Volume Scheme for Gas Water Flow in a Multi-Dimensional Porous Media  

E-Print Network (OSTI)

A classical model for water-gas flows in porous media is considered. The degenerate coupled system of equations obtained by mass conservation is usually approximated by finite volume schemes in the oil reservoir simulations. The convergence properties of these schemes are only known for incompressible fluids. This chapter deals with construction and convergence analysis of a finite volume scheme for compressible and immiscible flow in porous media. In comparison with incompressible fluid, compressible fluids requires more powerful techniques. We present a new result of convergence in a two or three dimensional porous medium and under the only modification that the density of gas depends on global pressure.

Bendahmane, Mostafa; Saad, Mazen

2011-01-01T23:59:59.000Z

194

COARSE-GRID SIMULATION OF REACTING AND NON-REACTING GAS-PARTICLE FLOWS  

SciTech Connect

The principal goal of this project, funded under the ''DOE Vision 21 Virtual Demonstration Initiative'' is virtual demonstration of circulating fluidized bed performance. We had proposed a ''virtual demonstration tool'', which is based on the open-domain CFD code MFIX. The principal challenge funded through this grant is to devise and implement in this CFD code sound physical models for the rheological characteristics of the gas-particle mixtures. Within the past year, which was the third year of the project, we have made the following specific advances. (a) We have completed a study of the impact of sub-grid models of different levels of detail on the results obtained in coarse-grid simulations of gas-particle flow. (b) We have also completed a study of a model problem to understand the effect of wall friction, which was proved in our earlier work to be very important for stable operation of standpipes in a circulating fluidized bed circuit. These are described in a greater detail in this report.

Sankaran Sundaresan

2004-03-01T23:59:59.000Z

195

Hydrogen turbines for space power systems: A simplified axial flow gas turbine model  

SciTech Connect

This paper descirbes a relatively simple axial flow gas expansion turbine mass model, which we developed for use in our space power system studies. The model uses basic engineering principles and realistic physical properties, including gas conditions, power level, and material stresses, to provide reasonable and consistent estimates of turbine mass and size. Turbine design modifications caused by boundary layer interactions, stress concentrations, stage leakage, or bending and thermal stresses are not accounted for. The program runs on an IBM PC, uses little computer time and has been incorporated into our system-level space power platform analysis computer codes. Parametric design studies of hydrogen turbines using this model are presented for both nickel superalloy and carbon/carbon composite turbines. The effects of speed, pressure ratio, and power level on hydrogen turbine mass are shown and compared to a baseline case 100-MWe, 10,000-rpm hydrogen turbine. Comparison with more detailed hydrogen turbine designs indicates that our simplified model provides mass estimates that are within 25% of the ones provided by more complex calculations. 8 figs.

Hudson, S.L.

1988-01-01T23:59:59.000Z

196

Design and Development of Gas-Liquid Cylindrical Cyclone Compact Separators for Three-Phase Flow  

SciTech Connect

The objective of this five-year project (October, 1997--September, 2002) is to expand the current research activities of Tulsa University Separation Technology Projects (TUSTP) to multiphase oil/water/gas separation. This project will be executed in two phases. Phase I (1997--2000) will focus on the investigations of the complex multiphase hydrodynamic flow behavior in a three-phase Gas-Liquid Cylindrical Cyclone (GLCC) Separator. The activities of this phase will include the development of a mechanistic model, a computational fluid dynamics (CFD) simulator, and detailed experimentation on the three-phase GLCC. The experimental and CFD simulation results will be suitably integrated with the mechanistic model. In Phase II (2000--2002), the developed GLCC separator will be tested under high pressure and real crudes conditions. This is crucial for validating the GLCC design for field application and facilitating easy and rapid technology deployment. Design criteria for industrial applications will be developed based on these results and will be incorporated into the mechanistic model by TUSTP.

Mohan, Ram S.; Shoham, Ovadia

1999-10-28T23:59:59.000Z

197

Design and Development of Gas-Liquid Cylindrical Cyclone Compact Separators for Three-Phase Flow  

SciTech Connect

The objective of this five-year project (October 1997--September 2002) was to expand the current research activities of Tulsa University Separation Technology Projects (TUSTP) to multiphase oil/water/gas separation. This project was executed in two phases. Phase I (1997--2000) focused on the investigations of the complex multiphase hydrodynamic flow behavior in a three-phase Gas-Liquid Cylindrical Cyclone (GLCC) Separator. The activities of this phase included the development of a mechanistic model, a computational fluid dynamics (CFD) simulator, and detailed experimentation on the three-phase GLCC. The experimental and CFD simulation results will be suitably integrated with the mechanistic model. In Phase II (2000--2002), the developed GLCC separator will be tested under high pressure and real crude conditions. This is crucial for validating the GLCC design for field application and facilitating easy and rapid technology deployment. Design criteria for industrial applications will be developed based on these results and will be incorporated into the mechanistic model by TUSTP.

Mohan, R.S.; Shoham, O.

2001-01-10T23:59:59.000Z

198

Rock matrix and fracture analysis of flow in western tight gas sands  

SciTech Connect

Advanced core analysis includes measurements on the matrix properties of the rock. Matrix properties are important even in fractured wells since it is these properties which determine the rate of gas flow into the fractures. Cores are being tested from the fluvial, coastal, and paludal zones of the Mesaverde. At least two cores from each of these zones from all three wells will be analyzed. Properties measured include permeability as a function of confining pressure over the range of 500 to 5000 psi. A minimum of two Klinkenberg permeabilities are being determined from at least five data points. Interpretation includes estimates of pore size from gas slippage. Water adsorption and desorption isotherms will be determined for selected samples with data points being obtained at the following relative humidities: 0, 20, 40, 60, 75, 90, 92, 95 and 98. Porosity measurements from both thin section examination and volumetric measurements are being made. These results will be compared with the porosities of the cored internals determined from logs.

Morrow, N.R.; Brower, K.R.; Ward, J.S.

1985-01-01T23:59:59.000Z

199

Light-induced torque for the generation of persistent current flow in atomic gas Bose-Einstein condensates  

SciTech Connect

We show that a persistent current flow in an atomic gas Bose-Einstein condensate could be realized when the system is subject to two counterpropagating Laguerre-Gaussian so-called doughnut beams, creating a toroidal trap. The theory is developed involving a two-photon process within three atomic levels leading to a quantized light-induced torque which rotates the atoms, generating an atomic current flow in the ring. We also show that it is possible for the torque to be controlled and even switched on and off by varying the frequencies of the incident light, thereby allowing a mechanism for the control of the current flow.

Lembessis, V. E. [New York College, 38 Amalias Avenue, GR-105 58, Athens (Greece); Babiker, M. [Department of Physics, University of York, York YO10 5DD (United Kingdom)

2010-11-15T23:59:59.000Z

200

Modular ultrahigh vacuum-compatible gas-injection system with an adjustable gas flow for focused particle beam-induced deposition  

Science Conference Proceedings (OSTI)

A gas-injection system (GIS) heats up a powdery substance and transports the resulting gas through a capillary into a vacuum chamber. Such a system can be used to guide a (metal)organic precursor gas very close to the focal area of an electron or ion beam, where a permanent deposit is created and adheres to the substrate. This process is known as focused particle beam-induced deposition. The authors present design principles and give construction details of a GIS suitable for ultrahigh vacuum usage. The GIS is composed of several self-contained components which can be customized rather independently. It allows for a continuously adjustable gas-flow rate. The GIS was attached to a standard scanning electron microscope (JEOL 6100) and tested with the tungsten precursor W(CO){sub 6}. The analysis of the deposits by means of atomic force microscopy and energy dispersive x-ray spectroscopy provides clear evidence that excellent gas-flow-rate stability and ensuing growth rate and metal-content reproducibility are experienced.

Klingenberger, D.; Huth, M. [Physikalisches Institut, Goethe University, 60438 Frankfurt am Main (Germany)

2009-09-15T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

A Finite-Difference Numerical Method for Onsager's Pancake Approximation for Fluid Flow in a Gas Centrifuge  

SciTech Connect

Gas centrifuges exhibit very complex flows. Within the centrifuge there is a rarefied region, a transition region, and a region with an extreme density gradient. The flow moves at hypersonic speeds and shock waves are present. However, the flow is subsonic in the axisymmetric plane. The analysis may be simplified by treating the flow as a perturbation of wheel flow. Wheel flow implies that the fluid is moving as a solid body. With the very large pressure gradient, the majority of the fluid is located very close to the rotor wall and moves at an azimuthal velocity proportional to its distance from the rotor wall; there is no slipping in the azimuthal plane. The fluid can be modeled as incompressible and subsonic in the axisymmetric plane. By treating the centrifuge as long, end effects can be appropriately modeled without performing a detailed boundary layer analysis. Onsager's pancake approximation is used to construct a simulation to model fluid flow in a gas centrifuge. The governing 6th order partial differential equation is broken down into an equivalent coupled system of three equations and then solved numerically. In addition to a discussion on the baseline solution, known problems and future work possibilities are presented.

de Stadler, M; Chand, K

2007-11-12T23:59:59.000Z

202

Development of a Multiscale Ionized Gas (MIG) Flow Code for Plasma Applications Subrata Roy Datta V. Gaitonde  

E-Print Network (OSTI)

dynamics, electromagnetics, chemical kinetics and molecular physics amongst others. A finite element basedDevelopment of a Multiscale Ionized Gas (MIG) Flow Code for Plasma Applications Subrata Roy Datta V applications including space propulsion thrusters and high-speed air vehicles. These are of considerable

Roy, Subrata

203

Natural gas conversion process  

Science Conference Proceedings (OSTI)

The experimental apparatus was dismantled and transferred to a laboratory space provided by Lawrence Berkeley Laboratory (LBL) which is already equipped with a high-ventilation fume hood. This will enable us to make tests at higher gas flow rates in a safe environment. Three papers presented at the ACS meeting in San Francisco (Symposium on Natural Gas Upgrading II) April 5--10, 1992 show that the goal of direct catalytic conversion of Methane into heavier Hydrocarbons in a reducing atmosphere is actively pursued in three other different laboratories. There are similarities in their general concept with our own approach, but the temperature range of the experiments reported in these recent papers is much lower and this leads to uneconomic conversion rates. This illustrates the advantages of Methane activation by a Hydrogen plasma to reach commercial conversion rates. A preliminary process flow diagram was established for the Integrated Process, which was outlined in the previous Quarterly Report. The flow diagram also includes all the required auxiliary facilities for product separation and recycle of the unconverted feed as well as for the preparation and compression of the Syngas by-product.

Not Available

1992-01-01T23:59:59.000Z

204

Final report for the ASC gas-powder two-phase flow modeling project AD2006-09.  

SciTech Connect

This report documents activities performed in FY2006 under the ''Gas-Powder Two-Phase Flow Modeling Project'', ASC project AD2006-09. Sandia has a need to understand phenomena related to the transport of powders in systems. This report documents a modeling strategy inspired by powder transport experiments conducted at Sandia in 2002. A baseline gas-powder two-phase flow model, developed under a companion PEM project and implemented into the Sierra code FUEGO, is presented and discussed here. This report also documents a number of computational tests that were conducted to evaluate the accuracy and robustness of the new model. Although considerable progress was made in implementing the complex two-phase flow model, this project has identified two important areas that need further attention. These include the need to compute robust compressible flow solutions for Mach numbers exceeding 0.35 and the need to improve conservation of mass for the powder phase. Recommendations for future work in the area of gas-powder two-phase flow are provided.

Evans, Gregory Herbert; Winters, William S.

2007-01-01T23:59:59.000Z

205

Investigation of Internal Cleaning Effects in Two-Phase Gas-Liquid Flows  

E-Print Network (OSTI)

Pressure waves in a gas-liquid medium with a stratifiedDynamics of Gas and Vapor-Liquid Media, Energoatomizdat,the pressure waves in a gas liquid medium with a stratified

Garg, Saurabh; Dornfeld, David; Klaus Berger

2009-01-01T23:59:59.000Z

206

Figure SR1. Flow of Natural Gas Imports and Exports, 2009  

U.S. Energy Information Administration (EIA)

Figure SR1 of the U.S. Natural Gas Imports & Exports: 2009. This report provides an overview of U.S. international natural gas trade in 2009. ...

207

Visualization of Geologic Stress Perturbations Using Mohr Diagrams  

Science Conference Proceedings (OSTI)

Huge salt formations, trapping large untapped oil and gas reservoirs, lie in the deepwater region of the Gulf of Mexico. Drilling in this region is high-risk and drilling failures have led to well abandonments, with each costing tens of millions of dollars. ... Keywords: Index Terms- Geomechanical modeling, Mohr diagrams, multiple coordinated views, tensor field visualization, tensor glyph.

Patricia Crossno; David H. Rogers; Rebecca M. Brannon; David Coblentz; Joanne T. Fredrich

2005-09-01T23:59:59.000Z

208

A coupled model for ring dynamics, gas flow, and oil flow through the ring grooves in IC engines  

E-Print Network (OSTI)

Oil flows through ring/groove interface play a critical role in oil transport among different regions the piston ring pack of internal combustion engines. This thesis work is intended to improve the understanding and ...

Jia, Ke, S. M. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

209

Algebric Decision Diagrams and Their Applications  

Science Conference Proceedings (OSTI)

In this paper we present theory and experimental results on Algebraic Decision Diagrams. These diagrams extend BDDs by allowing values from an arbitrary finite domain to be associated with the terminal nodes of the diagram. We present a treatment ... Keywords: decision diagrams, graph algorithms, linear algebra

R. I. Bahar; E. A. Frohm; C. M. Gaona; G. D. Hachtel; E. Macii; A. Pardo; F. Somenzi

1997-04-01T23:59:59.000Z

210

A NOVEL CONTINUOUS-FLOW REACTOR FOR GAS HYDRATE Patricia Taboada-Serrano  

E-Print Network (OSTI)

methane­produced water treatment, storage and transportation of natural gas, and gas separations of the guest gas, and by the regulation of operating parameters such as pressure, temperature, reactant ratios natural gas produced water management alternatives in the Wyoming portion of the Powder River Basin

Pennycook, Steve

211

Business Case Slide 7: High-Volume: Repository - Diagram  

NLE Websites -- All DOE Office Websites (Extended Search)

Diagram Previous Slide Next Slide Table of Contents High-Volume: Repository - Diagram Repository Tunnel Components...

212

Gas  

Science Conference Proceedings (OSTI)

... Implements a gas based on the ideal gas law. It should be noted that this model of gases is niave (from many perspectives). ...

213

Investigation of the Effect of Non-Darcy Flow and Multi-Phase Flow on the Productivity of Hydraulically Fractured Gas Wells  

E-Print Network (OSTI)

Hydraulic fracturing has recently been the completion of choice for most tight gas bearing formations. It has proven successful to produce these formations in a commercial manner. However, some considerations have to be taken into account to design an optimum stimulation treatment that leads to the maximum possible productivity. These considerations include, but not limited to, non-Darcy flow and multiphase flow effects inside the fracture. These effects reduce the fracture conductivity significantly. Failing to account for that results in overestimating the deliverability of the well and, consequently, to designing a fracture treatment that is not optimum. In this work a thorough investigation of non-Darcy flow and multi-phase flow effects on the productivity of hydraulically fractured wells is conducted and an optimum fracture design is proposed for a tight gas formation in south Texas using the Unified Fracture Design (UFD) Technique to compensate for the mentioned effects by calculating the effective fracture permeability in an iterative way. Incorporating non-Darcy effects results in an optimum fracture that is shorter and wider than the fracture when only Darcy calculations are considered. That leads to a loss of production of 5, 18 percent due to dry and multiphase non-Darcy flow effects respectively. A comparison between the UFD and 3D simulators is also done to point out the differences in terms of methodology and results. Since UFD incorporated the maximum dimensionless productivity index in the fracture dimensions design, unlike 3D simulators, it can be concluded that using UFD to design the fracture treatment and then use the most important fracture parameters outputs (half length and CfDopt) as inputs in the simulators is a recommended approach.

Alarbi, Nasraldin Abdulslam A.

2011-08-01T23:59:59.000Z

214

FEMO, A FLOW AND ENRICHMENT MONITOR FOR VERIFYING COMPLIANCE WITH INTERNATIONAL SAFEGUARDS REQUIREMENTS AT A GAS CENTRIFUGE ENRICHMENT FACILITY  

SciTech Connect

A number of countries have received construction licenses or are contemplating the construction of large-capacity gas centrifuge enrichment plants (GCEPs). The capability to independently verify nuclear material flows is a key component of international safeguards approaches, and the IAEA does not currently have an approved method to continuously monitor the mass flow of 235U in uranium hexafluoride (UF6) gas streams. Oak Ridge National Laboratory is investigating the development of a flow and enrichment monitor, or FEMO, based on an existing blend-down monitoring system (BDMS). The BDMS was designed to continuously monitor both 235U mass flow and enrichment of UF6 streams at the low pressures similar to those which exists at GCEPs. BDMSs have been installed at three sites-the first unit has operated successfully in an unattended environment for approximately 10 years. To be acceptable to GCEP operators, it is essential that the instrument be installed and maintained without interrupting operations. A means to continuously verify flow as is proposed by FEMO will likely be needed to monitor safeguards at large-capacity plants. This will enable the safeguards effectiveness that currently exists at smaller plants to be maintained at the larger facilities and also has the potential to reduce labor costs associated with inspections at current and future plants. This paper describes the FEMO design requirements, operating capabilities, and development work required before field demonstration.

Gunning, John E [ORNL; Laughter, Mark D [ORNL; March-Leuba, Jose A [ORNL

2008-01-01T23:59:59.000Z

215

Well-posedness for a multi-dimensional viscous gas-liquid two-phase flow model  

E-Print Network (OSTI)

The Cauchy problem of a multi-dimensional ($d\\geqslant 2$) compressible viscous gas-liquid two-phase flow model is concerned in this paper. We investigate the global existence and uniqueness of the strong solution for the initial data close to an equilibrium and the local in time existence and uniqueness of the solution with general initial data in the framework of Besov spaces. In both cases, the possible vacuum state is included in the equilibrium state for the gas component at spatial far field. A continuation criterion is also obtained for the local solution.

Hao, Chengchun

2011-01-01T23:59:59.000Z

216

Development of a new dynamic gas flow-control system in the pressure range of 1 Pa-133 Pa  

Science Conference Proceedings (OSTI)

A new flow-control system (FCS-705) has been developed at Korea Research Institute of Standards and Science. The system is intended for calibration of vacuum gauges in the pressure range of 1 Pa-133 Pa by comparison method. This paper describes some basic characteristics of the system including; (1) the design and construction of the system, (2) the generation of stable pressures in the chamber, (3) achieving high upstream pressure limit by installing a short duct in the by-pass pumping line, and (4) investigation of the gas flow regimes within the short duct.

Hong, S. S.; Chung, J. W. [Korea Research Institute of Standards and Science, Daejeon 305-340 (Korea, Republic of); Khan, Wakil [Pakistan Vacuum Society, street 17, Islamabad (Pakistan)

2011-12-15T23:59:59.000Z

217

A low NO/sub x/ combustion system and a ceramic cross flow heat exchanger for small gas turbines  

SciTech Connect

A new low NO/sub x/ oil-combustion system with superheated steam fuel evaporation prior to combustion has been found especially feasible for open cycle gas turbines with high turbine inlet temperatures and ceramic cross flow heat exchanger. The actual state of development of both the low NO/sub x/ light fuel-oil combustion system and ceramic heat exchanger elements, especially the cross flow type, is outlined in this paper. The use of this combustion system results in considerably lower combustion temperatures in the primary combustion zone, reducing the NO/sub x/-production even at high air temperatures when the air is preheated in the heat exchanger. The water vapour used for the evaporation of the fuel oil before combustion has an improving effect on the cycle efficiency comparable to the Cheng-dual-fluid-cycle. Illustrative evaluations for a gas turbine cycle for a shaft power of 70 kW are given.

Forster, S.; Quell, P.

1987-01-01T23:59:59.000Z

218

Design of a high-pressure research flow loop for the experimental investigation of liquid loading in gas wells  

E-Print Network (OSTI)

Liquid loading in producing gas wells is the inability of the produced gas to remove produced liquids from the wellbore. A review of existing flow loops worldwide revealed that specialized areas of research such as liquid loading in gas wells are still lacking dedicated test facilities. This project presents the design of a new dedicated facility to be located at the TowerLab at the Richardson building with adequate operating conditions to reproduce the flow regimes encountered prior to and after the onset of liquid loading in gas wells. The facility consists of a compressed air system, pipelines for air and water, a pressure vessel containing glass beads, an injection manifold, and flow control and monitoring devices. Our results show that three compressors working in parallel is the most technical and economic configuration for the TowerLab based on the overall costs provided by the supplier, the footprint but most importantly the flexibility. The design of the pressure vessel required a cylindrical body with top and bottom welded-flat head covers with multiple openings to minimize its weight. The pipelines connecting major equipment and injection manifold located at the pressure vessel were selected based on the superficial velocities for air and water. These values also showed the need for independent injection using two manifolds instead of commingling flow through a tee joint. The use of digital pressure gauges with an accuracy of 0.05 to 25% and coriolis or vortex meters to measure air flowrate is also suggested. For the water line, installation of turbine meters results in the most economic approach.

Fernandez Alvarez, Juan Jose

2008-12-01T23:59:59.000Z

219

Two-phase gas-liquid flow characteristics inside a plate heat exchanger  

Science Conference Proceedings (OSTI)

In the present study, the air-water two-phase flow characteristics including flow pattern and pressure drop inside a plate heat exchanger are experimentally investigated. A plate heat exchanger with single pass under the condition of counter flow is operated for the experiment. Three stainless steel commercial plates with a corrugated sinusoidal shape of unsymmetrical chevron angles of 55 and 10 are utilized for the pressure drop measurement. A transparent plate having the same configuration as the stainless steel plates is cast and used as a cover plate in order to observe the flow pattern inside the plate heat exchanger. The air-water mixture flow which is used as a cold stream is tested in vertical downward and upward flow. The results from the present experiment show that the annular-liquid bridge flow pattern appeared in both upward and downward flows. However, the bubbly flow pattern and the slug flow pattern are only found in upward flow and downward flow, respectively. The variation of the water and air velocity has a significant effect on the two-phase pressure drop. Based on the present data, a two-phase multiplier correlation is proposed for practical application. (author)

Nilpueng, Kitti [Department of Mechanical Engineering, South East Asia University, Bangkok 10160 (Thailand); Wongwises, Somchai [Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand)

2010-11-15T23:59:59.000Z

220

Cooling of X-ray Emitting Gas by Heat Conduction in the Center of Cooling Flow Clusters  

E-Print Network (OSTI)

We study the possibility that a large fraction of the gas at temperatures of ? 10 7 K in cooling flow clusters cools by heat conduction to lower temperatures, rather than by radiative cooling. We argue that this process, when incorporated into the so-called moderate cooling flow model, where the effective age of the intracluster medium is much lower than the age of the cluster, reduces substantially the expected X-ray luminosity from gas residing at temperatures of ? 10 7 K. In this model, the radiative mass cooling rate of gas at ? 10 7 K inferred from X-ray observations, which is heat conduction is regulated by reconnection between the magnetic field lines in cold ( ? 10 4 K) clouds and the field lines in the intracluster medium. A narrow conduction front is formed, which, despite the relatively low temperature, allows efficient heat conduction from the hot ICM to the cold clouds. The reconnection between the field lines in cold clouds and those in the intracluster medium occurs only when the magnetic field in the ICM is strong enough. This occurs only in the very inner regions of cooling flow clusters, at r ? 10 ? 30 kpc. The large ratio of the number of H? photons to the number of cooling hydrogen atoms is explained by this scenario. 1.

Noam Soker; L. Blanton; Craig L. Sarazin; Chandra Fellow

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Feynman diagrams versus Feynman quantum emulator  

E-Print Network (OSTI)

Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is usually plagued by the intricate quantum statistics at play. Here we present a cross-validation between a new theoretical approach, Bold Diagrammatic Monte Carlo (BDMC), and precision experiments on ultra-cold atoms. Specifically, we compute and measure with unprecedented accuracy the normal-state equation of state of the unitary gas, a prototypical example of a strongly correlated fermionic system. Excellent agreement demonstrates that a series of Feynman diagrams can be controllably resummed in a non-perturbative regime using BDMC. This opens the door to the solution of some of the most challenging problems across many areas of physics.

Van Houcke, K; Kozik, E; Prokofev, N; Svistunov, B; Ku, M; Sommer, A; Cheuk, L W; Schirotzek, A; Zwierlein, M W

2011-01-01T23:59:59.000Z

222

Onset and Subsequent Transient Phenomena of Liquid Loading in Gas Wells: Experimental Investigation Using a Large Scale Flow Loop  

E-Print Network (OSTI)

Liquid loading in gas wells is generally described as the inability of the well to lift the co-produced liquids up the tubing, which may ultimately kill the well. There is a lack of dedicated models that can mimic the transient features that are typical of liquid loading. Improved characterization of liquid loading in gas wells and enhanced prediction of future well performance can be achieved from the measurements and analyses resulting from this project. An experimental investigation was carried out to study the onset of liquid loading and the subsequent transient phenomena, using a large scale flow loop to visualize two-phase flow regimes, and to measure pressure and liquid holdup along a 42-m long vertical tube. From this investigation, it is possible to conclude that liquid loading should not be characterized based on onset criteria alone, and that it may not be a wellbore-only problem, as it would seem that the reservoir also plays a key role in determining if/when/how liquid loading manifests itself. Additionally, the results from the experimental campaign were used to compare the performance of different wellbore flow simulators. State-of-the-art simulators do not seem to fully capture the nature of liquid loading in vertical tubes. A simplified model is roposed here to evaluate the liquid transport during the transition from one flow regime to another, during the loading sequence.

Waltrich, Paulo

2012-08-01T23:59:59.000Z

223

Blending of hydrogen in natural gas distribution systems. Volume I. Gas blends flow in distribution system, mixing points, and regulatory standards. Final report, June 1, 1976--August 30, 1977. [10 and 20% hydrogen  

DOE Green Energy (OSTI)

This volume of the subject study ''Blending of Hydrogen in Natural Gas Distribution Systems'' describes studies on the determination of gas distribution system flows with hydrogen - natural gas blends, potential hydrogen admission points to gas distribution systems, and the impact of hydrogen - natural gas blends on regulatory standards for gas distribution systems. The studies resulted in the following principal findings: (1) Most existing natural gas distribution systems could adequately transport 20% blends of hydrogen by volume with little or no modification. (2) The best point of admission of the hydrogen into a natural gas distribution system would be at the meter and regulating stations supplying a particular distribution system. (3) The impact of hydrogen - natural gas blends on state regulatory standards appears to be minimal for PSE and G, but requires further study for various National Codes and for other states.

None

1977-09-01T23:59:59.000Z

224

STEADY STATE FLOW STUDIES OF SECTIONS IN NATURAL GAS PIPELINE NETWORKS.  

E-Print Network (OSTI)

??Efficient transportation of natural gas is vital to the success of the economy of the US and the world, because of the various uses of (more)

Ken-Worgu, Kenneth

2008-01-01T23:59:59.000Z

225

Oil and Gas Flow Data from the Top Hat and from the Choke Line...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Water Reactor Sustainability Program: Milestone Report on Materials and Machining of Specimens for the ATR-2 Experiment Natural Gas Imports and Exports - Second Quarter Report 2013...

226

Optimal fracture treatment design for dry gas wells maximizes well performance in the presence of non-Darcy flow effects  

E-Print Network (OSTI)

This thesis presents a methodology based on Proppant Number approach for optimal fracture treatment design of natural gas wells considering non-Darcy flow effects in the design process. Closure stress is taken into account, by default, because it is the first factor decreasing propped pack permeability at in-situ conditions. Gel damage was also considered in order to evaluate the impact of incorporating more damaging factors on ultimate well performance and optimal geometry. Effective fracture permeability and optimal fracture geometry are calculated through an iterative process. This approach was implemented in a spreadsheet. Non-Darcy flow is described by the ? factor. All ? factor correlations available in the literature were evaluated. It is recommended to use the correlation developed specifically for the given type of proppant and mesh size, if available. Otherwise, the Pursell et al. or the Martins et al. equations are recommended as across the board reliable correlations for predicting non-Darcy flow effects in the propped pack. The proposed methodology was implemented in the design of 11 fracture treatments of 3 natural tight gas wells in South Texas. Results show that optimal fracture design might increase expected production in 9.64 MMscf with respect to design that assumes Darcy flow through the propped pack. The basic finding is that for a given amount of proppant shorter and wider fractures compensate the non-Darcy and/or gel damage effect. Dynamic programming technique was implemented in design of multistage fractures for one of the wells under study for maximizing total gas production. Results show it is a powerful and simple technique for this application. It is recommended to expand its use in multistage fracture designs.

Lopez Hernandez, Henry De Jesus

2004-08-01T23:59:59.000Z

227

Effect of explicit representation of detailed stratigraphy on brine and gas flow at the Waste Isolation Pilot Plant  

Science Conference Proceedings (OSTI)

Stratigraphic units of the Salado Formation at the Waste Isolation Pilot Plant (WIPP) disposal room horizon includes various layers of halite, polyhalitic halite, argillaceous halite, clay, and anhydrite. Current models, including those used in the WIPP Performance Assessment calculations, employ a ``composite stratigraphy`` approach in modeling. This study was initiated to evaluate the impact that an explicit representation of detailed stratigraphy around the repository may have on fluid flow compared to the simplified ``composite stratigraphy`` models currently employed. Sensitivity of model results to intrinsic permeability anisotropy, interbed fracturing, two-phase characteristic curves, and gas-generation rates were studied. The results of this study indicate that explicit representation of the stratigraphy maintains higher pressures and does not allow as much fluid to leave the disposal room as compared to the ``composite stratigraphy`` approach. However, the differences are relatively small. Gas migration distances are also different between the two approaches. However, for the two cases in which explicit layering results were considerably different than the composite model (anisotropic and vapor-limited), the gas-migration distances for both models were negligible. For the cases in which gas migration distances were considerable, van Genuchten/Parker and interbed fracture, the differences between the two models were fairly insignificant. Overall, this study suggests that explicit representation of the stratigraphy in the WIPP PA models is not required for the parameter variations modeled if ``global quantities`` (e.g., disposal room pressures, net brine and gas flux into and out of disposal rooms) are the only concern.

Christian-Frear, T.L.; Webb, S.W. [Sandia National Labs., Albuquerque, NM (United States). Geohydrology Dept.

1996-04-01T23:59:59.000Z

228

Purged window apparatus. [On-line spectroscopic analysis of gas flow systems  

DOE Patents (OSTI)

A purged window apparatus is described which utilizes tangentially injected heated purge gases in the vicinity of electromagnetic radiation transmitting windows and a tapered external mounting tube to accelerate these gases to provide a vortex flow on the window surface and a turbulent flow throughout the mounting tube thereby preventing backstreaming of flowing gases under investigation in a chamber to which a plurality of similar purged apparatus is attached with the consequent result that spectroscopic analyses can be undertaken for lengthy periods without the necessity of interrupting the flow for cleaning or replacing the windows due to contamination.

Ballard, E.O.

1982-04-05T23:59:59.000Z

229

Injection, flow, and mixing of CO2 in porous media with residual gas.  

Science Conference Proceedings (OSTI)

Geologic structures associated with depleted natural gas reservoirs are desirable targets for geologic carbon sequestration (GCS) as evidenced by numerous pilot and industrial-scale GCS projects in these environments world-wide. One feature of these GCS targets that may affect injection is the presence of residual CH{sub 4}. It is well known that CH{sub 4} drastically alters supercritical CO{sub 2} density and viscosity. Furthermore, residual gas of any kind affects the relative permeability of the liquid and gas phases, with relative permeability of the gas phase strongly dependent on the time-history of imbibition or drainage, i.e., dependent on hysteretic relative permeability. In this study, the effects of residual CH{sub 4} on supercritical CO{sub 2} injection were investigated by numerical simulation in an idealized one-dimensional system under three scenarios: (1) with no residual gas; (2) with residual supercritical CO{sub 2}; and (3) with residual CH{sub 4}. We further compare results of simulations that use non-hysteretic and hysteretic relative permeability functions. The primary effect of residual gas is to decrease injectivity by decreasing liquid-phase relative permeability. Secondary effects arise from injected gas effectively incorporating residual gas and thereby extending the mobile gas plume relative to cases with no residual gas. Third-order effects arise from gas mixing and associated compositional effects on density that effectively create a larger plume per unit mass. Non-hysteretic models of relative permeability can be used to approximate some parts of the behavior of the system, but fully hysteretic formulations are needed to accurately model the entire system.

Oldenburg, C.M.; Doughty, C.A.

2010-09-01T23:59:59.000Z

230

Transient gas or liquid flow along a preexisting or hydraulically-induced fracture in a permeable medium  

DOE Green Energy (OSTI)

Similarity solutions are derived for the trasient two-dimensional flow of a gas or liquid along an isolated fracture in a permeable medium. The driving pressure at the fracture inlet is constant, and the confining stress is uniform. Two different cases are considered, pre-existing fractures with uniform aperture as well as hydraulic fractures with a variable aperture proportional to the local overpressure (fluid pressure less confining stress). The evolution of the pressure distribution is described by a set of four asymptotic solutions, each having a self-similar form. At early times the flow in the fracture is turbulent, and Darcian seepage losses into the porous surroundings are negligible. At late times the flow in the fracture is laminar, and seepage losses become a dominant consideration. At intermediate times there are two alternative asymptotes, depending upon physical parameters. The mathematical model also describe the flow along a fracture which is fulled with high-permeability porous material as well as the flow in an assemblage of porous blocks. 19 refs., 10 figs.

Nilson, R.H.; Morrison, F.A. Jr.

1985-05-01T23:59:59.000Z

231

Reasoning on temporal class diagrams: Undecidability results  

Science Conference Proceedings (OSTI)

This paper introduces a temporal class diagram language useful to model temporal varying data. The atemporal portion of the language contains the core constructors available in both EER diagrams and UML class diagrams. The temporal part of the language ... Keywords: computer science, database theory, description logics, knowledge representation, temporal data models, temporal logics

Alessandro Artale

2006-03-01T23:59:59.000Z

232

CFD Analysis for Flow Behavior Characteristics in the Upper Plenum during low flow/low pressure transients for the Gas Cooled Fast Reactor (GCFR)  

Science Conference Proceedings (OSTI)

Gas coolant at low pressure exhibits poor heat transfer characteristics. This is an area of concern for the passive response targeted by the Generation IV GCFR design. For the first 24 hour period, the decay heat removal for the GCFR design is dependent on an actively powered blower, which also would reduce the temperature in the fuel during transients, before depending on the passive operation. Natural circulation cooling initiates when the blower is stopped for the final phase of the decay heat removal, as under forced convection the core decay heat is adequately cooled by the running blower. The ability of the coolant to flow in the reverse direction or having recirculation, when the blowers are off, necessitates more understanding of the flow behavior characteristics in the upper plenum. The work done here focuses primarily on the period after the blower has been turned off, as the core is adequately cooled when the blowers are running, thus there was no need to carry out the analysis for the first 24 hours. In order to understand the plume behavior for the GCFR upper plenum several cases were run, with air, helium and helium-air mixture. For each case, the FLUENT was used to characterize the steady state velocity vectors and corresponding temperature in the upper plenum under passive decay heat removal conditions. This study will provide better insight into the plume interaction in the upper plenum at low flow and low pressure conditions.

Piyush Sabharwall; Theron Marshall; Kevan Weaver; Hans Gougar

2007-05-01T23:59:59.000Z

233

A high sensitivity fiber optic macro-bend based gas flow rate transducer for low flow rates: Theory, working principle, and static calibration  

SciTech Connect

A novel fiber optic macro-bend based gas flowmeter for low flow rates is presented. Theoretical analysis of the sensor working principle, design, and static calibration were performed. The measuring system consists of: an optical fiber, a light emitting diode (LED), a Quadrant position sensitive Detector (QD), and an analog electronic circuit for signal processing. The fiber tip undergoes a deflection in the flow, acting like a cantilever. The consequent displacement of light spot center is monitored by the QD generating four unbalanced photocurrents which are function of fiber tip position. The analog electronic circuit processes the photocurrents providing voltage signal proportional to light spot position. A circular target was placed on the fiber in order to increase the sensing surface. Sensor, tested in the measurement range up to 10 l min{sup -1}, shows a discrimination threshold of 2 l min{sup -1}, extremely low fluid dynamic resistance (0.17 Pa min l{sup -1}), and high sensitivity, also at low flow rates (i.e., 33 mV min l{sup -1} up to 4 l min{sup -1} and 98 mV min l{sup -1} from 4 l min{sup -1} up to 10 l min{sup -1}). Experimental results agree with the theoretical predictions. The high sensitivity, along with the reduced dimension and negligible pressure drop, makes the proposed transducer suitable for medical applications in neonatal ventilation.

Schena, Emiliano; Saccomandi, Paola; Silvestri, Sergio [Center for Integrated Research, Unit of Measurements and Biomedical Instrumentation, Universita Campus Bio-Medico di Roma, Via Alvaro del Portillo, 21, 00128 Rome (Italy)

2013-02-15T23:59:59.000Z

234

Design of high-efficiency turbomachinery and gas turbines  

SciTech Connect

The present treatment of pump, compressor, and turbine turbomachinery emphasizes thermodynamics, design methods, and the use that can be made of relatively simple rules for the choosing of cycle types, vector diagrams, blading types, heat exchanger configurations, etc. Gas dynamics are treated to the virtual exclusion of mechanical design considerations, although a brief historical account of the family of turbomachine systems notes gradual structural as well as thermodynamic and gas dynamic refinements. The complete systems described and analyzed include aircraft, marine, and electrical power generation gas turbines, steam turbines, and hydraulic pumps and turbines. Both axial and centrifugal flow turbomachine types are considered. 112 references.

Wilson, D.G.

1984-01-01T23:59:59.000Z

235

The development of a curb valve flow meter for gas theft detection  

E-Print Network (OSTI)

As the supply of natural gas continues to dwindle, and government decontrol of pricing progresses, the rising cost of this essential natural resource will drive more individuals to consider various forms of pilferage as a ...

Fitzgerald, Kevin Francis

1984-01-01T23:59:59.000Z

236

Study on flow parameters optimisation for marine gas turbine intercooler system based on simulation experiment  

Science Conference Proceedings (OSTI)

The thermodynamic calculation software of Intercooled-Cycle gas turbine was developed to observe the impacts that the environmental parameters and cold degrees of intercooler produce quantitatively on this marine engine performance. And then, the mathematical ...

Yu-long Ying; Yun-peng Cao; Shu-ying Li; Zhi-tao Wang

2013-06-01T23:59:59.000Z

237

Figure SR1. Flow of Natural Gas Imports and Exports, 2008  

U.S. Energy Information Administration (EIA)

Figure SR1 of the U.S. Natural Gas Imports & Exports: 2008. ... In 2008 LNG exports went primarily to Japan, after a small amount went to Russia in 2007.

238

Gas-phase chemistry during the conversion of cyclohexane to carbon: Flow reactor studies at low and intermediate pressure  

DOE Green Energy (OSTI)

The gas-phase branching during the conversion of cyclohexane to solid carbon has been measured in a high-temperature-flow reactor. The experiments show that cyclohexane decomposes into a broad distribution of hydrocarbons that further decompose into the more kinetically stable products hydrogen, methane, acetylene, ethylene, benzene, and PAH. At 1363 K, the evolution to these species occurs quickly. We also observe the buildup of significant amounts of aromatic molecules at later stages in the decomposition, with as much as 15% of the total carbon in PAH and 25% in benzene. At later stages, the gas-phase molecules react slowly, even though the system is not at equilibrium, because of their kinetic stability and the smaller radical pool. The decomposition does not appear to depend sensitively on pressure in the regime of 25 to 250 torr. Thus, to a first approximation, these results can be extrapolated to atmospheric pressure.

Osterheld, T.H.; Allendorf, M.D.; Larson, R.

1995-07-01T23:59:59.000Z

239

Design Calculations for Gas Flow & Diffusion Behavior in the large Diameter Container & Cask  

DOE Green Energy (OSTI)

This report describes the calculations for the gas behavior in the void volumes or gas spaces of the sludge Large Diameter Container (LDC) and Cask. The objective is to prevent flammable gas conditions in the LDC and Cask gas spaces. This is achieved by the Active Inert Ventilation System (AIVS), which uses argon gas for dilution purposes. With AIVS, the oxygen content is kept below 5 vol% in the LDC, and the hydrogen content is kept below 4 vol% in the Cask before its purge at the KE Basin. After the Cask sweep-through purge with argon at the KE Basin, oxygen is kept below 5% in both the Cask and the LDC. The analysis here assumes that any oxygen generated in the sludge is consumed by the uranium and uranium dioxide (SNF-18133, ''Gas Behavior in Large Diameter Containers (LDCs) During and Following Loading with 105K East Sludge''). Thus, oxygen production from radiolysis is intentionally not included in this report, but hydrogen from radiolysis and from chemical reactions between uranium and water are considered, depending on the scenario being analyzed. The analysis starts immediately after the final decant at K Basin, when argon is assumed to be the only gas in the LDC gas space, except for the normal water vapor. The oxygen ingress is calculated during the disconnecting of the lines hoses from the LDC, during the time that air is surrounding the LDC with two NucFil-type filters in place after the disconnect, before the Cask is sealed, and, finally, during the sweep-through Cask purge. Dissolution of oxygen from water due to increasing sludge temperatures (mainly during hot transport to the T Plant) is also included.

PIEPHO, M.G.

2003-10-21T23:59:59.000Z

240

Heat Flow and Gas Hydrates on the Continental Margin of India: Building on Results from NGHP Expedition 01  

SciTech Connect

The Indian National Gas Hydrate Program (NGHP) Expedition 01 presented the unique opportunity to constrain regional heat flow derived from seismic observations by using drilling data in three regions on the continental margin of India. The seismic bottom simulating reflection (BSR) is a well-documented feature in hydrate bearing sediments, and can serve as a proxy for apparent heat flow if data are available to estimate acoustic velocity and density in water and sediments, thermal conductivity, and seafloor temperature. Direct observations of temperature at depth and physical properties of the sediment obtained from drilling can be used to calibrate the seismic observations, decreasing the uncertainty of the seismically-derived estimates. Anomalies in apparent heat flow can result from a variety of sources, including sedimentation, erosion, topographic refraction and fluid flow. We constructed apparent heat flow maps for portions of the Krishna-Godavari (K-G) basin, the Mahanadi basin, and the Andaman basin and modeled anomalies using 1-D conductive thermal models. Apparent heat flow values in the Krishna-Godavari (K-G) basin and Mahanadi basin are generally 0.035 to 0.055 watts per square meter (W/m2). The borehole data show an increase in apparent heat flow as water depth increases from 900 to 1500 m. In the SW part of the seismic grid, 1D modeling of the effect of sedimentation on heat flow shows that ~50% of the observed increase in apparent heat flow with increasing water depth can be attributed to trapping of sediments behind a "toe-thrust" ridge that is forming along the seaward edge of a thick, rapidly accumulating deltaic sediment pile. The remainder of the anomaly can be explained either by a decrease in thermal conductivity of the sediments filling the slope basin or by lateral advection of heat through fluid flow along stratigraphic horizons within the basin and through flexural faults in the crest of the anticline. Such flow probably plays a role in bringing methane into the ridge formed by the toe-thrust. Because of the small anomaly due to this process and the uncertainty in thermal conductivity, we did not model this process explicitly. In the NE part of the K-G basin seismic grid, a number of local heat flow lows and highs are observed, which can be attributed to topographic refraction and to local fluid flow along faults, respectively. No regional anomaly can be resolved. Because of lack of continuity between the K-G basin sites within the seismic grid and those ~70 km to the NE in water depths of 1200 to 1500 m, we do not speculate on the reason for higher heat flow at these depths. The Mahanadi basin results, while limited in geographic extent, are similar to those for the KG basin. The Andaman basin exhibits much lower apparent heat flow values, ranging from 0.015 to 0.025 W/m2. Heat flow here also appears to increase with increasing water depth. The very low heat flow here is among the lowest heat flow observed anywhere and gives rise to a very thick hydrate stability zone in the sediments. Through 1D models of sedimentation (with extremely high sedimentation rates as a proxy for tectonic thickening), we concluded that the very low heat flow can probably be attributed to the combined effects of high sedimentation rate, low thermal conductivity, tectonic thickening of sediments and the cooling effect of a subducting plate in a subduction zone forearc. Like for the K-G basin, much of the local variability can be attributed to topography. The regional increase in heat flow with water depth remains unexplained because the seismic grid available to us did not extend far enough to define the local tectonic setting of the slope basin controlling this observational pattern. The results are compared to results from other margins, both active and passive. While an increase in apparent heat flow with increasing water depth is widely observed, it is likely a result of different processes in different places. The very low heat flow due to sedimentation and tectonics in the Andaman basin is at the low end of glob

Trehu, Anne; Kannberg, Peter

2011-06-30T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Heat Flow and Gas Hydrates on the Continental Margin of India: Building on Results from NGHP Expedition 01  

Science Conference Proceedings (OSTI)

The Indian National Gas Hydrate Program (NGHP) Expedition 01 presented the unique opportunity to constrain regional heat flow derived from seismic observations by using drilling data in three regions on the continental margin of India. The seismic bottom simulating reflection (BSR) is a well-documented feature in hydrate bearing sediments, and can serve as a proxy for apparent heat flow if data are available to estimate acoustic velocity and density in water and sediments, thermal conductivity, and seafloor temperature. Direct observations of temperature at depth and physical properties of the sediment obtained from drilling can be used to calibrate the seismic observations, decreasing the uncertainty of the seismically-derived estimates. Anomalies in apparent heat flow can result from a variety of sources, including sedimentation, erosion, topographic refraction and fluid flow. We constructed apparent heat flow maps for portions of the Krishna-Godavari (K-G) basin, the Mahanadi basin, and the Andaman basin and modeled anomalies using 1-D conductive thermal models. Apparent heat flow values in the Krishna-Godavari (K-G) basin and Mahanadi basin are generally 0.035 to 0.055 watts per square meter (W/m{sup 2}). The borehole data show an increase in apparent heat flow as water depth increases from 900 to 1500 m. In the SW part of the seismic grid, 1D modeling of the effect of sedimentation on heat flow shows that {approx}50% of the observed increase in apparent heat flow with increasing water depth can be attributed to trapping of sediments behind a 'toe-thrust' ridge that is forming along the seaward edge of a thick, rapidly accumulating deltaic sediment pile. The remainder of the anomaly can be explained either by a decrease in thermal conductivity of the sediments filling the slope basin or by lateral advection of heat through fluid flow along stratigraphic horizons within the basin and through flexural faults in the crest of the anticline. Such flow probably plays a role in bringing methane into the ridge formed by the toe-thrust. Because of the small anomaly due to this process and the uncertainty in thermal conductivity, we did not model this process explicitly. In the NE part of the K-G basin seismic grid, a number of local heat flow lows and highs are observed, which can be attributed to topographic refraction and to local fluid flow along faults, respectively. No regional anomaly can be resolved. Because of lack of continuity between the K-G basin sites within the seismic grid and those {approx}70 km to the NE in water depths of 1200 to 1500 m, we do not speculate on the reason for higher heat flow at these depths. The Mahanadi basin results, while limited in geographic extent, are similar to those for the K-G basin. The Andaman basin exhibits much lower apparent heat flow values, ranging from 0.015 to 0.025 W/m{sup 2}. Heat flow here also appears to increase with increasing water depth. The very low heat flow here is among the lowest heat flow observed anywhere and gives rise to a very thick hydrate stability zone in the sediments. Through 1D models of sedimentation (with extremely high sedimentation rates as a proxy for tectonic thickening), we concluded that the very low heat flow can probably be attributed to the combined effects of high sedimentation rate, low thermal conductivity, tectonic thickening of sediments and the cooling effect of a subducting plate in a subduction zone forearc. Like for the K-G basin, much of the local variability can be attributed to topography. The regional increase in heat flow with water depth remains unexplained because the seismic grid available to us did not extend far enough to define the local tectonic setting of the slope basin controlling this observational pattern. The results are compared to results from other margins, both active and passive. While an increase in apparent heat flow with increasing water depth is widely observed, it is likely a result of different processes in different places. The very low heat flow due to sedimentation and tectonics in the Andaman basi

Anne Trehu; Peter Kannberg

2011-06-30T23:59:59.000Z

242

Rapid Solar-thermal Dissociation of Natural Gas in an Aerosol Flow Reactor  

E-Print Network (OSTI)

as compared to conventional steam-methane reforming and furnace black processing. Introduction by the furnace black process. For steam reforming, steam is reacted with methane over a reforming catalyst. Currently, hydrogen is produced through the steam reforming of natural gas and carbon black is produced

243

PARTICLE IMAGE VELOCIMETRY MEASUREMENTS IN A REPRESENTATIVE GAS-COOLED PRISMATIC REACTOR CORE MODEL: FLOW IN THE COOLANT CHANNELS AND INTERSTITIAL BYPASS GAPS  

Science Conference Proceedings (OSTI)

Core bypass flow is one of the key issues with the prismatic Gas Turbine-Modular Helium Reactor, and it refers to the coolant that navigates through the interstitial, non-cooling passages between the graphite fuel blocks instead of traveling through the designated coolant channels. To determine the bypass flow, a double scale representative model was manufactured and installed in the Matched Index-of-Refraction flow facility; after which, stereo Particle Image Velocimetry (PIV) was employed to measure the flow field within. PIV images were analyzed to produce vector maps, and flow rates were calculated by numerically integrating over the velocity field. It was found that the bypass flow varied between 6.9-15.8% for channel Reynolds numbers of 1,746 and 4,618. The results were compared to computational fluid dynamic (CFD) pre-test simulations. When compared to these pretest calculations, the CFD analysis appeared to under predict the flow through the gap.

Thomas E. Conder; Richard Skifton; Ralph Budwig

2012-11-01T23:59:59.000Z

244

Apparatus for establishing and maintaining a stable discharge across a stream of flowing gas, particularly useful for high-power lasers  

SciTech Connect

Apparatus is described for establishing and maintaining a stable discharge across a stream of gas flowing through a gas-flow channel, which consists of: an electrode system including a group of working electrodes disposed on opposite sides of the gas flow channel and spaced longitudinally thereof in the direction of gas flow, which working electrodes include at least one upstream electrode at the upstream end of the gas flow channel; a high-voltage alternating current source connected at one side to each of the working electrodes and at the opposite side to a point of fixed reference potential; and a ballast impedance connected to each of the working electrodes for stabilizing the electrical discharge; the electrode system further including at least one starting electrode adjacent to the upstream working electrode and connected to the point of fixed reference potential via a ballast impedance of substantially larger impedance value than those connected to the working electrodes, such that the starting electrode is effective to bring the point of fixed reference potential to the upstream working electrode to start the discharge, and to draw little current after the discharge has been started.

Katz, D.

1986-03-04T23:59:59.000Z

245

Application of Phase Diagram Calculation to Accelerated ...  

Science Conference Proceedings (OSTI)

Presentation Title, Application of Phase Diagram Calculation to Accelerated Development of Mo-Si-B Based Alloys. Author(s), Ying Yang, H Bei, Shuanglin...

246

Continuous Heating Dissolution Diagrams of Aluminum Alloys  

Science Conference Proceedings (OSTI)

The method developed by Milkereit et al. [Milkereit et al. 2009] for quenching experiments can be used, to establish continuous heating dissolution diagrams.

247

Database Design Using Entity-Relationship Diagrams  

Science Conference Proceedings (OSTI)

With this comprehensive guide, database designers and developers can quickly learn all the ins and outs of E-R diagramming to become expert database designers.

Sikha Bagui; Richard Earp

2003-06-01T23:59:59.000Z

248

State energy flow patterns. [All 50 states  

SciTech Connect

Highly visual and self-explanatory 1975 energy flow diagrams are presented for each of the 50 states and for the entire United States. Each diagram illustrates the energy produced and how it is consumed or lost. The diagrams are meant to serve as a convenient and useful reference (or starting point) for consideration of energy-related problems.

Kidman, R.B.; Barrett, R.J.

1977-01-01T23:59:59.000Z

249

EOS3nn: An iTOUGH2 module for non-Newtonian liquid and gas flow  

E-Print Network (OSTI)

related to the two phases gas and liquid, respectively. Eachassociated phases, gas and liquid, respectively. For anintroduce data describing gas and liquid properties. Record

Wu, Yu-Shu; Finsterle, Stefan; Pruess, Karsten

2002-01-01T23:59:59.000Z

250

DESIGN AND DEVELOPMENT OF GAS-LIQUID CYLINDRICAL CYCLONE COMPACT SEPARATORS FOR THREE-PHASE FLOW  

SciTech Connect

This report presents a brief overview of the activities and tasks accomplished during the second half year (April 1, 2001-September 30, 2001) of the fourth project year budget period (October 1, 2000-September 30, 2001). An executive summary is presented initially followed by the tasks of the current budget period. Then, detailed description of the experimental and modeling investigations are presented. Subsequently, the technical and scientific results of the activities of this project period are presented with some discussions. The findings of this investigation are summarized in the ''Conclusions'' section followed by relevant references. The fourth project year activities are divided into three main parts, which are carried out in parallel. The first part is continuation of the experimental program that includes a study of the oil/water two-phase behavior at high pressures and control system development for the three-phase GLCC{copyright}. This investigation will be eventually extended for three-phase flow. The second part consists of the development of a simplified mechanistic model incorporating the experimental results and behavior of dispersion of oil in water and water in oil. This will provide an insight into the hydrodynamic flow behavior and serve as the design tool for the industry. Although useful for sizing GLCC{copyright} for proven applications, the mechanistic model will not provide detailed hydrodynamic flow behavior information needed to screen new geometric variations or to study the effect of fluid property variations. Therefore, in the third part, the more rigorous approach of computational fluid dynamics (CFD) will be utilized. Multidimensional multiphase flow simulation at high pressures and for real crude conditions will provide much greater depth into the understanding of the physical phenomena and the mathematical analysis of three-phase GLCC{copyright} design and performance.

Dr. Ram S. Mohan; Dr. Ovadia Shoham

2001-10-30T23:59:59.000Z

251

DESIGN AND DEVELOPMENT OF GAS-LIQUID CYLINDRICAL CYCLONE COMPACT SEPARATORS FOR THREE-PHASE FLOW  

SciTech Connect

This report presents a brief overview of the activities and tasks accomplished during the first half year (October 1, 2000-March 31, 2001) of the fourth project year budget period (October 1, 2000-September 30, 2001). An executive summary is presented initially followed by the tasks of the current budget period. Then, detailed description of the experimental and modeling investigations are presented. Subsequently, the technical and scientific results of the activities of this project period are presented with some discussions. The findings of this investigation are summarized in the ''Conclusions'' section followed by relevant references. The fourth project year activities are divided into three main parts, which are carried out in parallel. The first part is continuation of the experimental program that includes a study of the oil/water two-phase behavior at high pressures and control system development for the three-phase GLCC{copyright}. This investigation will be eventually extended for three-phase flow. The second part consists of the development of a simplified mechanistic model incorporating the experimental results and behavior of dispersion of oil in water and water in oil. This will provide an insight into the hydrodynamic flow behavior and serve as the design tool for the industry. Although useful for sizing GLCC{copyright} for proven applications, the mechanistic model will not provide detailed hydrodynamic flow behavior information needed to screen new geometric variations or to study the effect of fluid property variations. Therefore, in the third part, the more rigorous approach of computational fluid dynamics (CFD) will be utilized. Multidimensional multiphase flow simulation at high pressures and for real crude conditions will provide much greater depth into the understanding of the physical phenomena and the mathematical analysis of three-phase GLCC{copyright} design and performance.

Dr. Ram S. Mohan; Dr. Ovadia Shoham

2001-04-30T23:59:59.000Z

252

Influence of Atmospheric Pressure and Water Table Fluctuations on Gas Phase Flow and Transport of Volatile Organic Compounds (VOCs) in Unsaturated Zones  

E-Print Network (OSTI)

Understanding the gas phase flow and transport of volatile organic compounds (VOCs) in unsaturated zones is indispensable to develop effective environmental remediation strategies, to create precautions for fresh water protection, and to provide guidance for land and water resources management. Atmospheric pressure and water table fluctuations are two important natural processes at the upper and lower boundaries of the unsaturated zone, respectively. However, their significance has been neglected in previous studies. This dissertation systematically investigates their influence on the gas phase flow and transport of VOCs in soil and ground water remediation processes using analytically and numerically mathematical modeling. New semi-analytical and numerical solutions are developed to calculate the subsurface gas flow field and the gas phase transport of VOCs in active soil vapor extraction (SVE), barometric pumping (BP) and natural attenuation taking into account the atmospheric pressure and the water table fluctuations. The accuracy of the developed solutions are checked by comparing with published analytical solutions under extreme conditions, newly developed numerical solutions in COMSOL Multiphysics and field measured data. Results indicate that both the atmospheric pressure and the tidal-induced water table fluctuations significantly change the gas flow field in active SVE, especially when the vertical gas permeability is small (less than 0.4 Darcy). The tidal-induced downward moving water table increases the depth-averaged radius of influence (ROI) for the gas pumping well. However, this downward moving water table leads to a greater vertical pore gas velocity away from the gas pumping well, which is unfavorable for removing VOCs. The gas flow rate to/from the barometric pumping well can be accurately calculated by our newly developed solutions in both homogeneous and multi-layered unsaturated zones. Under natural unsaturated zone conditions, the time-averaged advective flux of the gas phase VOCs induced by the atmospheric pressure and water table fluctuations is one to three orders of magnitude less than the diffusive flux. The time-averaged advective flux is comparable with the diffusive flux only when the gas-filled porosity is very small (less than 0.05). The density-driven flux is negligible.

You, Kehua

2013-05-01T23:59:59.000Z

253

Efficiently approximating query optimizer plan diagrams  

Science Conference Proceedings (OSTI)

Given a parametrized n-dimensional SQL query template and a choice of query optimizer, a plan diagram is a color-coded pictorial enumeration of the execution plan choices of the optimizer over the query parameter space. These diagrams have proved to ...

Atreyee Dey; Sourjya Bhaumik; Harish D; Jayant R. Haritsa

2008-08-01T23:59:59.000Z

254

CFD Analysis of Turbulent Flow Phenomena in the Lower Plenum of a Prismatic Gas-Cooled Reactor  

Science Conference Proceedings (OSTI)

This paper is concerned with the implementation of a computational model of turbulent flow in a section of the lower plenum of Very High Temperature Reactor (VHTR). The proposed model has been encoded in a state-of-the-art CFD code, NPHASE. The results of NPHASE predictions have been compared against the experimental data collected using a scaled model of a sub-region in the lower plenum of a modular prismatic gas-cooled reactor. It has been shown that the NPHASE-based model is capable of predicting a three-dimensional velocity field in a complex geometrical configuration of VHTR lower plenum. The current and future validations of computational predictions are necessary for design and analysis of new reactor concepts, as well as for safety analysis and licensing calculations.

T. Gallaway; S.P. Antal; M.Z. Podowski; D.P. Guillen

2007-09-01T23:59:59.000Z

255

Development of a screened cathode gas flow proportional counter for in situ field determination of alpha contamination in soil  

SciTech Connect

This study resulted in the design, construction and testing of a gas flow proportional counter for in-situ determination of soil contamination. The uniqueness of this detector is the screened material used for the cathode. A Pu-239 source of 0.006 {micro}Ci was mounted to the outside of the cathode to simulate radioactive soil. The detector probe was placed into a laboratory mock-up and tested to determine operating voltage, efficiency and energy resolution. Two gas flow proportional counters were built and tested. The detectors are cylindrical, each with a radius of 1.905 cm, having an anode wire with a radius of 0.0038 cm. The length of the smaller detector`s anode was 2.54 cm, and the length of the larger detector`s anode was 7.64 cm. Therefore, the active volumes were 28.96 cm{sup 3} and 87.10 cm{sup 3}, respectively, for the small and large detector. An operating voltage of 1,975 volts was determined to be sufficient for both detectors. The average efficiency was 2.59 {+-} 0.12% and 76.71 {+-} 10.81% for the small volume and large volume detectors, respectively. The average energy resolution for the low-energy peak of the small detector was 4.24 {+-} 1.28% and for the large-energy peak was 1.37 {+-} 0.66%. The large detectors` energy resolution was 17.75 {+-} 3.74%. The smaller detector, with better energy resolution, exhibited a bi-modal spectrum, whereas the larger detector`s spectrum centered around a single broad peak.

Bush, S.P.

1997-02-01T23:59:59.000Z

256

Coupled gas flow/solid dynamics model for predicting the formation of fracture patterns in gas well simulation experiments. [Propellant mixture used instead of explosives to fracture rock surrounding borehole  

DOE Green Energy (OSTI)

A two-dimensional finite element model for predicting fracture patterns obtained in high energy gas fracture experiments is presented. In these experiments, a mixture of propellants is used instead of explosives to fracture the rock surrounding the borehole. The propellant mixture is chosen to tailor the pressure pulse so that multiple fractures emanate from the borehole. The model allows the fracture pattern and pressure pulse to be calculated for different combinations of propellant mixture, in situ stress conditions, and rock properties. The model calculates the amount of gas generated by the burning propellants using a burn rate given by a power law in pressure. By assuming that the gas behaves as a perfect gas and that the flow down the fractures is isothermal, the loss of gas from the borehole due to flow down the cracks is accounted for. The flow of gas down the cracks is included in an approximate manner by assuming self-similar pressure profiles along the fractures. Numerical examples are presented and compared to three different full-scale experiments. Results show a good correlation with the experimental data over a wide variety of test parameters. 9 reference, 10 figures, 3 tables.

Taylor, L.M.; Swenson, D.V.; Cooper, P.W.

1984-07-01T23:59:59.000Z

257

A Fast Network Flow Model is used in conjunction with Measurements of Filter Permeability to calculate the Performance of Hot Gas Filters  

SciTech Connect

Two different technologies that are being considered for generating electric power on a large scale by burning coal are Pressurized Fluid Bed Combustion (PFBC) systems and Integrated Gasification and Combined Cycle (IGCC) systems. Particulate emission regulations that have been proposed for future systems may require that these systems be fitted with large scale Hot Gas Clean-Up (HGCU) filtration systems that would remove the fine particulate matter from the hot gas streams that are generated by PFBC and IGCC systems. These hot gas filtration systems are geometrically and aerodynamically complex. They typically are constructed with large arrays of ceramic candle filter elements (CFE). The successful design of these systems require an accurate assessment of the rate at which mechanical energy of the gas flow is dissipated as it passes through the filter containment vessel and the individual candle filter elements that make up the system. Because the filtration medium is typically made of a porous ceramic material having open pore sizes that are much smaller than the dimensions of the containment vessel, the filtration medium is usually considered to be a permeable medium that follows Darcy's law. The permeability constant that is measured in the lab is considered to be a function of the filtration medium only and is usually assumed to apply equally to all the filters in the vessel as if the flow were divided evenly among all the filter elements. In general, the flow of gas through each individual CFE will depend not only on the geometrical characteristics of the filtration medium, but also on the local mean flows in the filter containment vessel that a particular filter element sees. The flow inside the CFE core, through the system manifolds, and inside the containment vessel itself will be coupled to the flow in the filter medium by various Reynolds number effects. For any given filter containment vessel, since the mean flows are different in different locations inside the vessel, the flow of gas through an individual CFE will adjust itself to accommodate the local mean flows that prevail in its general location. In some locations this adjustment will take place at High Reynolds numbers and in other locations this will occur at low Reynolds numbers. The analysis done here investigates the nature of this coupling.

VanOsdol, J.G.; Chiang, T-K.

2002-09-19T23:59:59.000Z

258

Natural gas conversion process. Sixth quarterly report  

Science Conference Proceedings (OSTI)

The experimental apparatus was dismantled and transferred to a laboratory space provided by Lawrence Berkeley Laboratory (LBL) which is already equipped with a high-ventilation fume hood. This will enable us to make tests at higher gas flow rates in a safe environment. Three papers presented at the ACS meeting in San Francisco (Symposium on Natural Gas Upgrading II) April 5--10, 1992 show that the goal of direct catalytic conversion of Methane into heavier Hydrocarbons in a reducing atmosphere is actively pursued in three other different laboratories. There are similarities in their general concept with our own approach, but the temperature range of the experiments reported in these recent papers is much lower and this leads to uneconomic conversion rates. This illustrates the advantages of Methane activation by a Hydrogen plasma to reach commercial conversion rates. A preliminary process flow diagram was established for the Integrated Process, which was outlined in the previous Quarterly Report. The flow diagram also includes all the required auxiliary facilities for product separation and recycle of the unconverted feed as well as for the preparation and compression of the Syngas by-product.

Not Available

1992-12-01T23:59:59.000Z

259

Anisotropic voronoi diagrams and guaranteed-quality anisotropic mesh generation  

Science Conference Proceedings (OSTI)

We introduce anisotropic Voronoi diagrams, a generalization of multiplicatively weighted Voronoi diagrams suitable for generating guaranteed-quality meshes of domains in which long, skinny triangles are required, and where the desired anisotropy ... Keywords: anisotropic Voronoi diagram, anisotropic mesh generation

Francois Labelle; Jonathan Richard Shewchuk

2003-06-01T23:59:59.000Z

260

Increasing the Reliability of Reliability Diagrams  

Science Conference Proceedings (OSTI)

The reliability diagram is a common diagnostic graph used to summarize and evaluate probabilistic forecasts. Its strengths lie in the ease with which it is produced and the transparency of its definition. While visually appealing, major long-...

Jochen Brcker; Leonard A. Smith

2007-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Fluctuations and the QCD phase diagram  

SciTech Connect

In this contribution the role of quantum fluctuations for the QCD phase diagram is discussed. This concerns in particular the importance of the matter back-reaction to the gluonic sector. The impact of these fluctuations on the location of the confinement/deconfinement and the chiral transition lines as well as their interrelation are investigated. Consequences of our findings for the size of a possible quarkyonic phase and location of a critical endpoint in the phase diagram are drawn.

Schaefer, B.-J., E-mail: bernd-jochen.schaefer@uni-graz.at [Karl-Franzens-Universitaet, Institut fuer Physik (Austria)

2012-06-15T23:59:59.000Z

262

QCD Phase Diagram with Imaginary Chemical Potential  

E-Print Network (OSTI)

We report our recent results on the QCD phase diagram obtained from the lattice QCD simulation. The location of the phase boundary between hadronic and QGP phases in the two-flavor QCD phase diagram is investigated. The imaginary chemical potential approach is employed, which is based on Monte Carlo simulations of the QCD with imaginary chemical potential and analytic continuation to the real chemical potential region.

Nagata, Keitaro

2011-01-01T23:59:59.000Z

263

Order-of-Magnitude Influence Diagrams  

E-Print Network (OSTI)

In this paper, we develop a qualitative theory of influence diagrams that can be used to model and solve sequential decision making tasks when only qualitative (or imprecise) information is available. Our approach is based on an order-of-magnitude approximation of both probabilities and utilities and allows for specifying partially ordered preferences via sets of utility values. We also propose a dedicated variable elimination algorithm that can be applied for solving order-of-magnitude influence diagrams.

Marinescu, Radu

2012-01-01T23:59:59.000Z

264

155 Phase Diagram of Tetragonal Tungsten Bronze Material  

Science Conference Proceedings (OSTI)

We studied the different possibilities of the phase diagram according to the values of the Landau coefficients. The obtained phase diagram is compared with

265

Production and Handling Slide 22: UF6 Phase Diagram  

NLE Websites -- All DOE Office Websites (Extended Search)

UF6 Phase Diagram Skip Presentation Navigation First Slide Previous Slide Next Slide Last Presentation Table of Contents UF6 Phase Diagram Refer to caption below for image...

266

NIST Pipeline-Scale Flow Measurement Standards for Natural ...  

Science Conference Proceedings (OSTI)

Pipeline-Scale Flow Measurement Standards for Natural Gas. Summary: NIST natural gas flow calibrations are performed ...

2013-01-28T23:59:59.000Z

267

Shock dynamics of phase diagrams  

E-Print Network (OSTI)

A thermodynamic phase transition denotes a drastic change of state of a physical system due to a continuous change of thermodynamic variables, as for instance pressure and temperature. The classical van der Waals equation of state is the simplest model that predicts the occurrence of a critical point associated with the gas-liquid phase transition. Nevertheless, below the critical temperature, theoretical predictions of the van der Waals theory significantly depart from the observed physical behaviour. We develop a novel approach to classical thermodynamics based on the solution of Maxwell relations for a generalised family of nonlocal entropy functions. This theory provides an exact mathematical description of discontinuities of the order parameter within the phase transition region, it explains the universal form of the equations of state and the occurrence of triple points in terms of the dynamics of nonlinear shock wave fronts.

Antonio Moro

2013-07-29T23:59:59.000Z

268

Establishment of very uniform gas-flow pattern in the process chamber for microwave-excited high-density plasma by ceramic shower plate  

SciTech Connect

The authors developed a ceramic upper shower plate used in the microwave-excited high-density plasma process equipment incorporating a dual shower-plate structure to establish a very uniform gas-flow pattern in the process chamber. Thousands of very fine gas-injection holes are implemented on this Al{sub 2}O{sub 3} upper shower plate with optimized allocation to establish a uniform gas-flow pattern of plasma-excitation gases and radical-generation gases for generating intended radicals in the plasma-excitation region. The size of these fine holes must be 50 {mu}m or less in diameter and 8 mm or more in length because these holes perform an essential role: They completely avoid the plasma excitation in these fine holes and upper gas-supply regions resulting from the plasma penetration into these regions from excited high-density plasma, even if very high-density plasma greater than 1x10{sup 12} cm{sup -3} is excited just under the ceramic upper shower plate by microwaves supplied from the radial line slot antenna. On the other hand, various process gases, such as material gases for film formations and etching gases, are supplied from the lower shower plate installed in the diffusion plasma region to this very uniform gas-flow pattern region of plasma-excitation gases and radical-generation gases. As a result, the process gases are supplied to the wafer surface in a very effective manner without excess decomposition of those process gas molecules and undesired reaction-product deposition on the inner surface of the process chamber. The process results are improved drastically by introducing the newly developed ceramic upper shower plate. But also, process uniformity on the entire wafer is improved with drastically reducing reaction-product deposition on the inner surface of the process chamber.

Goto, Tetsuya; Inokuchi, Atsutoshi; Ishibashi, Kiyotaka; Yasuda, Seij; Nakanishi, Toshio; Kohno, Masayuki; Okesaku, Masahiro; Sasaki, Masaru; Nozawa, Toshihisa; Hirayama, Masaki; Ohmi, Tadahiro [New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579 (Japan); Tokyo Electron Ltd., Tokyo 107-6325 (Japan); Tokyo Electron Technology Development Institute, Inc., Hyogo 660-0891 (Japan); New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579 (Japan); Tokyo Electron AT Ltd., Hyogo 660-0891 (Japan); Hokuriku Seikei Industrial, Co., Ltd., Ishikawa 923-0157 (Japan); Tokyo Electron Technology Development Institute, Inc., Hyogo 660-0891 (Japan); New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579 (Japan)

2009-07-15T23:59:59.000Z

269

3D conforming power diagrams for radial LGR in CPG reservoir grids  

Science Conference Proceedings (OSTI)

Mesh generation becomes a crucial step in reservoir flow simulation of new generation. The mesh must faithfully represent the architecture of the reservoir and its heterogeneity. In (Flandrin et al. in IJNME 65(10):16391672, 2006) a three-dimensional ... Keywords: CPG grids, Hybrid mesh, Local grid refinement, PEBI grids, Power diagrams, Reservoir simulation

C. Bennis; H. Borouchaki; N. Flandrin

2008-06-01T23:59:59.000Z

270

GASCAP: Wellhead Gas Productive Capacity Model documentation, June 1993  

SciTech Connect

The Wellhead Gas Productive Capacity Model (GASCAP) has been developed by EIA to provide a historical analysis of the monthly productive capacity of natural gas at the wellhead and a projection of monthly capacity for 2 years into the future. The impact of drilling, oil and gas price assumptions, and demand on gas productive capacity are examined. Both gas-well gas and oil-well gas are included. Oil-well gas productive capacity is estimated separately and then combined with the gas-well gas productive capacity. This documentation report provides a general overview of the GASCAP Model, describes the underlying data base, provides technical descriptions of the component models, diagrams the system and subsystem flow, describes the equations, and provides definitions and sources of all variables used in the system. This documentation report is provided to enable users of EIA projections generated by GASCAP to understand the underlying procedures used and to replicate the models and solutions. This report should be of particular interest to those in the Congress, Federal and State agencies, industry, and the academic community, who are concerned with the future availability of natural gas.

Not Available

1993-07-01T23:59:59.000Z

271

Richard P. Feynman and the Feynman Diagrams  

Office of Scientific and Technical Information (OSTI)

Richard P. Feynman and the Feynman Diagrams Richard P. Feynman and the Feynman Diagrams Feynman Honored · Resources with Additional Information Richard P. Feynman Courtesy AIP Emilio Segrè Visual Archives, Weber Collection 'Feynman remade quantum electrodynamics-the theory of the interaction between light and matter-and thus altered the way science understands the nature of waves and particles. He was co-awarded the Nobel Prize for Physics in 1965 for this work, which tied together in an experimentally perfect package all the varied phenomena at work in light, radio, electricity, and magnetism. ... The problem-solving tools that he invented-including pictorial representations of particle interactions known as Feynman diagrams-permeated many areas of theoretical physics in the second half of the 20th century.'

272

If-Diagrams: Theory and Application  

E-Print Network (OSTI)

This paper presents a novel algebra of logic that generalizes the traditional Boolean algebra for partial (incompletely specified) variables and functions and is efficiently used to solve a lot of theoretical and practical optimization problems. Based on the logic, novel operations (including a very useful minimization operation), laws, and expansions are introduced. The logic allows generalizations of the traditional Boolean function representation forms. One of the most important generalization for BDDs is If-Diagrams (IFDs). The paper presents operations on the IFDs and diagram application fields. The theoretical results are used in a software implemented on Prolog for an IBM PC platform.

Anatoly Prihozhy State

1997-01-01T23:59:59.000Z

273

Numerical simulations of the Macondo well blowout reveal strong control of oil flow by reservoir permeability and exsolution of gas  

E-Print Network (OSTI)

Reservoir Flow of Carbon Dioxide and Variable Salinityproduction, geologic carbon dioxide sequestration, nucleardeveloped for geologic carbon dioxide sequestration studies,

Oldenburg, C.M.

2013-01-01T23:59:59.000Z

274

Fluid Metrology Calibration Services - Gas, Water, or Liquid ...  

Science Conference Proceedings (OSTI)

Fluid Metrology Calibration Services - Gas, Water, Natural Gas, or Liquid Hydrocarbon Flows Special Tests. Fluid Metrology ...

2013-01-25T23:59:59.000Z

275

STRUCTURED MOLECULAR GAS REVEALS GALACTIC SPIRAL ARMS  

Science Conference Proceedings (OSTI)

We explore the development of structures in molecular gas in the Milky Way by applying the analysis of the brightness distribution function and the brightness distribution index (BDI) in the archival data from the Boston University-Five College Radio Astronomy Observatory {sup 13}CO J = 1-0 Galactic Ring Survey. The BDI measures the fractional contribution of spatially confined bright molecular emission over faint emission extended over large areas. This relative quantity is largely independent of the amount of molecular gas and of any conventional, pre-conceived structures, such as cores, clumps, or giant molecular clouds. The structured molecular gas traced by higher BDI is located continuously along the spiral arms in the Milky Way in the longitude-velocity diagram. This clearly indicates that molecular gas changes its structure as it flows through the spiral arms. Although the high-BDI gas generally coincides with H II regions, there is also some high-BDI gas with no/little signature of ongoing star formation. These results support a possible evolutionary sequence in which unstructured, diffuse gas transforms itself into a structured state on encountering the spiral arms, followed by star formation and an eventual return to the unstructured state after the spiral arm passage.

Sawada, Tsuyoshi [Joint ALMA Office, Alonso de Cordova 3107, Vitacura, Santiago 763-0355 (Chile); Hasegawa, Tetsuo [NAOJ Chile Observatory, Joaquin Montero 3000 Oficina 702, Vitacura, Santiago 763-0409 (Chile); Koda, Jin, E-mail: sawada.tsuyoshi@nao.ac.jp [Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800 (United States)

2012-11-01T23:59:59.000Z

276

Effects of photon escape on diagnostic diagrams for HII regions  

E-Print Network (OSTI)

In this article we first outline the mounting evidence that a significant fraction of the ionizing photons emitted by OB stars within HII regions escape from their immediate surroundings and explain how an HII region structure containing high density contrast in homogeneities facilitates this escape. Next we describe sets of models containing inhomogeneities which are used to predict tracks in the commonly used diagnostic diagrams (based on ratios of emission lines) whose only independent variable is the photon escape fraction, xi. We show that the tracks produced by the models in two of the most cited of these diagrams conform well to the distribution of observed data points, with the models containing optically thick inhomogeneities ("CLUMPY" models) yielding somewhat better agreement than those with optically thin inhomogeneities ("FF" models). We show how variations in the ionization parameter U, derived from emission line ratios, could be due to photon escape. Using a rather wide range of assumptions about the filling factor of dense clumps we find, for a selected set of regions observed in M51 photon escape fraction ranging between 30% and 50%. We show, using oxygen as the test element, that models with different assumptions about the gas inhomogeneity will give variations in the abundance values derived from diagnostic diagrams, but do not claim here to have a fully developed set of diagnostic tools to improve abundance determinations made in this way. We finally propose a combination of line ratios with the absolute Halpha luminosity of a given HII region, which allows us to determine the photon escape fraction, and hence resolve the degeneracy between U and xi.

C. Giammanco; J. E. Beckman; B. Cedres

2005-04-11T23:59:59.000Z

277

Numerical Simulation Of Gas-Droplet Flow Around A Nozzle In A Cylindrical Chamber Using A Lagrangian Model Based On A Multigrid Navier-Stokes Solver  

E-Print Network (OSTI)

A numerical simulation of an upward directed, 2-- dimensional, turbulent gas--droplet flow around an axisymmetric nozzle in a cylindrical chamber was made. We use a Lagrangian method, where trajectories of many droplets are calculated from the equations of motion along with the continuity and momentum equations of fluid. Strong coupling effects between the two phases are dealt with. Special algorithms were introduced for particle tracking and interpolation of the fluid flow data at the particle location on the numerical grid, which use multigrid structure for improvement of the speed of droplet trajectory calculation. The Lagrangian solver for the calculation of the trajectory and particle momentum source term was parallelised on a workstation cluster using a host--node programming model. The resulting droplet and fluid velocities at different cross sections of the cylindrical chamber are reported and compared with measurements. 2. INTRODUCTION In many engineering flow situations par...

Thomas Frank; Ingvelde Schulze

1994-01-01T23:59:59.000Z

278

Numerical simulations of the Macondo well blowout reveal strong control of oil flow by reservoir permeability and exsolution of gas  

E-Print Network (OSTI)

the viscosity of crude oil systems, J. Pet. Tech. (Sep. ),gases released from the BP oil well blowout, Natureof reservoir depletion and oil flow from the Macondo well

Oldenburg, C.M.

2013-01-01T23:59:59.000Z

279

Three dimensional hysdrodynamic lattice-gas simulations of binary immiscible and ternary amphiphilic flow through porous media  

E-Print Network (OSTI)

We report the results of a study of multiphase flow in porous media. A Darcy's law for steady multiphase flow was investigated for both binary and ternary amphiphilic flow. Linear flux-forcing relationships satisfying Onsager reciprocity were shown to be a good approximation of the simulation data. The dependence of the relative permeability coefficients on water saturation was investigated and showed good qualitative agreement with experimental data. Non-steady state invasion flows were investigated, with particular interest in the asymptotic residual oil saturation. The addition of surfactant to the invasive fluid was shown to significantly reduce the residual oil saturation.

Peter J. Love; Jean-Bernard Maillet; Peter V. Coveney

2001-09-25T23:59:59.000Z

280

Time and Tide Wait for No Diagram  

E-Print Network (OSTI)

Time plays an important role in some application domains, and can be quite difficult to deal with in diagrams. This is not only true for temporal uncertainty, but also for periodic events. We compare nine different representations that include a notion of time or that are mainly used for temporal information: Time Lines/LifeLines, AsbruView, Gantt- and PERT-Charts, Shinkansen timetables, Temporal Objects, Sets of Possible Occurrences (SOPOs), the Time Cube and Concentric Circles. Features of the different methods are presented and compared to other representations. This paper is meant to help the designer of a diagram or visualization who has to deal with time get an overview over different design ideas, and maybe get an inspiration for their own ideas. Keywords Information Visualization, Time in Problem Solving Methods, Knowledge Acquisition, Knowledge Engineering and Modeling Methodologies

Robert Kosara; Peter Messner; Silvia Miksch

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

A reverse engineering tool for precise class diagrams  

Science Conference Proceedings (OSTI)

Developers use class diagrams to describe the architecture of their programs intensively. Class diagrams represent the structure and global behaviour of programs. They show the programs classes and interfaces and their relationships of inheritance, instantiation, ...

Yann-Gal Guhneuc

2004-10-01T23:59:59.000Z

282

The QCD phase diagram: Results and challenges  

Science Conference Proceedings (OSTI)

I review the progress made in recent years with functional methods in our understanding of the QCD phase diagram. In particular I discuss a renormalisation group approach to QCD at finite temperature and chemical potential. Results include the location of the confinement-deconfinement phase transition/cross-over and the chiral phase transition/cross-over lines, their nature as well as their interrelation, and thermodynamic observables.

Pawlowski, Jan M. [Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany); ExtreMe Matter Institute EMMI, GSI, Planckstr. 1, 64291 Darmstadt (Germany)

2011-05-23T23:59:59.000Z

283

Mixed wasted integrated program: Logic diagram  

SciTech Connect

The Mixed Waste Integrated Program Logic Diagram was developed to provide technical alternative for mixed wastes projects for the Office of Technology Development`s Mixed Waste Integrated Program (MWIP). Technical solutions in the areas of characterization, treatment, and disposal were matched to a select number of US Department of Energy (DOE) treatability groups represented by waste streams found in the Mixed Waste Inventory Report (MWIR).

Mayberry, J.; Stelle, S. [Science Applications International Corp., Idaho Falls, ID (United States); O`Brien, M. [Univ. of Arizona, Tucson, AZ (United States); Rudin, M. [Univ. of Nevada, Las Vegas, NV (United States); Ferguson, J. [Lockheed Idaho Technologies Co., Idaho Falls, ID (United States); McFee, J. [I.T. Corp., Albuquerque, NM (United States)

1994-11-30T23:59:59.000Z

284

Worldline Green Functions for Arbitrary Feynman Diagrams  

E-Print Network (OSTI)

We propose a general method to obtain the scalar worldline Green function on an arbitrary 1D topological space, with which the first-quantized method of evaluating 1-loop Feynman diagrams can be generalized to calculate arbitrary ones. The electric analog of the worldline Green function problem is found and a compact expression for the worldline Green function is given, which has similar structure to the 2D bosonic Green function of the closed bosonic string.

Peng Dai; Warren Siegel

2006-08-09T23:59:59.000Z

285

THE EXPERIMENTALLY VALIDATED Mg-C PHASE DIAGRAM AND ...  

Science Conference Proceedings (OSTI)

Jul 20, 2012 ... CARBON IN MG ALLOYS: THE EXPERIMENTALLY VALIDATED Mg-C PHASE DIAGRAM AND THERMODYNAMIC CALCULATIONS IN...

286

CFD Analysis of Core Bypass Flow and Crossflow in the Prismatic Very High Temperature Gas-cooled Nuclear Reactor  

E-Print Network (OSTI)

Very High Temperature Rector (VHTR) had been designated as one of those promising reactors for the Next Generation (IV) Nuclear Plant (NGNP). For a prismatic core VHTR, one of the most crucial design considerations is the bypass flow and crossflow effect. The bypass flow occurs when the coolant flow into gaps between fuel blocks. These gaps are formed as a result of carbon expansion and shrinkage induced by radiations and manufacturing and installation errors. Hot spots may appear in the core if the large portion of the coolant flows into bypass gaps instead of coolant channels in which the cooling efficiency is much higher. A preliminary three dimensional steady-state CFD analysis was performed with commercial code STARCCM+ 6.04 to investigate the bypass flow and crossflow phenomenon in the prismatic VHTR core. The k-? turbulence model was selected because of its robustness and low computational cost with respect to a decent accuracy for varied flow patterns. The wall treatment used in the present work is two-layer all y+ wall treatment to blend the wall laws to estimate the shear stress. Uniform mass flow rate was chose as the inlet condition and the outlet condition was zero gauge pressure outlet. Grid independence study was performed and the results indicated that the discrepancy of the solution due to the mesh density was within 2% of the bypass flow fraction. The computational results showed that the bypass flow fraction was around 12%. Furthermore, the presence of the crossflow gap resulted in a up to 28% reduction of the coolant in the bypass flow gap while mass flow rate of coolant in coolant channels increased by around 5%. The pressure drop at the inlet due to the sudden contraction in area could be around 1kpa while the value was about 180 Pa around the crossflow gap region. The error analysis was also performed to evaluate the accumulated errors from the process of discretization and iteration. It was found that the total error was around 4% and the variation for the bypass flow fraction was within 1%.

Wang, Huhu 1985-

2012-12-01T23:59:59.000Z

287

Preferential mode of gas invasion in sediments : grain-scale model of coupled multiphase fluid flow and sediment mechanics  

E-Print Network (OSTI)

We present a discrete element model for simulating, at the grain scale, gas migration in brine-saturated deformable media. We rigorously account for the presence of two fluids in the pore space by incorporating forces on ...

Jain, Antone Kumar

2009-01-01T23:59:59.000Z

288

Density-Enthalpy Phase Diagram 0D Boiler Simulation  

E-Print Network (OSTI)

Density-Enthalpy Phase Diagram 0D Boiler Simulation Finite Element Method Further Research Finite Transitions #12;Density-Enthalpy Phase Diagram 0D Boiler Simulation Finite Element Method Further Research;Density-Enthalpy Phase Diagram 0D Boiler Simulation Finite Element Method Further Research Goal

Vuik, Kees

289

Multiphase flow calculation software  

DOE Patents (OSTI)

Multiphase flow calculation software and computer-readable media carrying computer executable instructions for calculating liquid and gas phase mass flow rates of high void fraction multiphase flows. The multiphase flow calculation software employs various given, or experimentally determined, parameters in conjunction with a plurality of pressure differentials of a multiphase flow, preferably supplied by a differential pressure flowmeter or the like, to determine liquid and gas phase mass flow rates of the high void fraction multiphase flows. Embodiments of the multiphase flow calculation software are suitable for use in a variety of applications, including real-time management and control of an object system.

Fincke, James R. (Idaho Falls, ID)

2003-04-15T23:59:59.000Z

290

Demonstration plant engineering and design. Phase I. The pipeline gas demonstration plant. Volume 9. Plant Section 800: product gas compression and drying  

SciTech Connect

Contract No. EF-77-C-01-2542 between Conoco Inc. and the US Department of Energy provides for the design, construction, and operation of a demonstration plant capable of processing bituminous caking coals into clean pipeline quality gas. The project is currently in the design phase scheduled to be completed in June 1981. One of the major efforts of Phase I is the completion of the process design and the project engineering design of the Demonstration Plant. This design effort has been completed. A report of the design effort is being issued in 24 volumes. This is Volume 9 which reports the design of Plant Section 800 - Product Gas Compression and Drying. Plant Section 800 compresses, cools, and drys the SNG product to conditions and specifications required for pipeline use. A conventional triethylene glycol (TEG) gas drying unit is employed to reduce the moisture content of the SNG to less than 7 pounds per million standard cubic feet. The product SNG has a minimum pressure of 800 psig and a maximum temperature of 100/sup 0/F. This section also includes the product gas analysis, metering, and totalizing instruments. It is designed to remove 3144 pounds of water from 19 million SCFC of SNG product. Volume 9 contains the following design information: process operation; design basis; heat and material balance; stream compositions; utility, chemical and catalyst summary; major equipment and machinery list; major equipment and machinery requisitions; instrument list; instrument requisitions; line lists; process flow diagram; engineering flow diagrams; and section plot plan.

Not Available

1981-01-01T23:59:59.000Z

291

Elbow mass flow meter  

SciTech Connect

Elbow mass flow meter. The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity.

McFarland, Andrew R. (College Station, TX); Rodgers, John C. (Santa Fe, NM); Ortiz, Carlos A. (Bryan, TX); Nelson, David C. (Santa Fe, NM)

1994-01-01T23:59:59.000Z

292

PLIF flow visualization of methane gas jet from spark plug fuel injector in a direct injection spark ignition engine  

Science Conference Proceedings (OSTI)

A Spark Plug Fuel Injection (SPFI), which is a combination of a fuel injector and a spark plug was developed with the aim to convert any gasoline port injection spark ignition engine to gaseous fuel direct injection [1]. A direct fuel injector is combined ... Keywords: air-fuel mixing, direct fuel injection, flow visualization, gaseous fuel, laser-induced fluorescent

Taib Iskandar Mohamad; How Heoy Geok

2008-11-01T23:59:59.000Z

293

CONTINUOUS GAS ANALYZER  

DOE Patents (OSTI)

A reagent gas and a sample gas are chemically combined on a continuous basis in a reaction zone maintained at a selected temperature. The reagent gas and the sample gas are introduced to the reaction zone at preselected. constant molar rates of flow. The reagent gas and the selected gas in the sample mixture combine in the reaction zone to form a product gas having a different number of moles from the sum of the moles of the reactants. The difference in the total molar rates of flow into and out of the reaction zone is measured and indicated to determine the concentration of the selected gas.

Katz, S.; Weber, C.W.

1960-02-16T23:59:59.000Z

294

Novel selective surface flow (SSF{sup TM}) membranes for the recovery of hydrogren from waste gas streams. Final report  

DOE Green Energy (OSTI)

The waste streams are off-gas streams from various chemical/refinery operations. In Phase I, the architecture of the membrane and the separation device were defined and demonstrated. The system consists of a shell-and-tube separator in which the gas to be separated is fed to the tube side, the product is collected as high pressure effluent and the permeate constitutes the waste/fuel stream. Each tube, which has the membrane coated on the interior, does the separation. A multi- tube separator device containing 1 ft{sup 2} membrane area was built and tested. The engineering data were used for designing a process for hydrogen recovery from a fluid catalytic cracker off-gas stream. First-pass economics showed that overall cost for hydrogen production is reduced by 35% vs on-purpose production of hydrogen by steam- methane reforming. The hydrogen recovery process using the SSF membrane results in at least 15% energy reduction and significant decrease in CO{sub 2} and NO{sub x} emissions.

Anand, M. [USDOE, Washington, DC (United States)

1995-08-01T23:59:59.000Z

295

Gas separating  

DOE Patents (OSTI)

Feed gas is directed tangentially along the non-skin surface of gas separation membrane modules comprising a cylindrical bundle of parallel contiguous hollow fibers supported to allow feed gas to flow from an inlet at one end of a cylindrical housing through the bores of the bundled fibers to an outlet at the other end while a component of the feed gas permeates through the fibers, each having the skin side on the outside, through a permeate outlet in the cylindrical casing. 3 figs.

Gollan, A.

1988-03-29T23:59:59.000Z

296

The Plutonium-Copper Phase Diagram  

SciTech Connect

The constitution of the plutonium-copper binary alloy as determined by differential thermal analysis is presented. The system is characterized by two congruent melting compounds, PuCu2 (m.p. 865 degrees C.) and Pu4Cu17 (m.p. 954 degrees C.); two incongruent melting compounds, PuCu4 (m.p. 906 degrees C.) and Pu2Cu11 (m.p. 926 degrees C.); three eutectics, 96 atom per cent copper (m.p. 626 degrees), 70.5 atom per cent copper (m.p. 849 degrees C.), and 91 atom per cent copper (m.p. 881 degrees C.); and two peritectics at 75 atom per cent (m.p. 906 degrees C.) and 85.5 atom per cent (m.p. 926 degrees C.). Solid solution was found above 97 atom per cent plutonium. The apparatus, the method of investigation, and the binary alloy phase diagram is discussed.

Rhinehammer, T. B.; Etter, D. E.; Jones, L. V.

1960-01-01T23:59:59.000Z

297

Bayesian Image Reconstruction Based on Voronoi Diagrams  

E-Print Network (OSTI)

We present a Bayesian Voronoi image reconstruction technique (VIR) for interferometric data. Bayesian analysis applied to the inverse problem allows us to derive the a-posteriori probability of a novel parameterization of interferometric images. We use a variable Voronoi diagram as our model in place of the usual fixed pixel grid. A quantization of the intensity field allows us to calculate the likelihood function and a-priori probabilities. The Voronoi image is optimized including the number of polygons as free parameters. We apply our algorithm to deconvolve simulated interferometric data. Residuals, restored images and chi^2 values are used to compare our reconstructions with fixed grid models. VIR has the advantage of modeling the image with few parameters, obtaining a better image from a Bayesian point of view.

G. F. Cabrera; S. Casassus; N. Hitschfeld

2007-12-26T23:59:59.000Z

298

The Geometry of General Phase Diagram Sections - Programmaster ...  

Science Conference Proceedings (OSTI)

It is shown that all proper phase diagram sections obey the same simple set of geometrical rules, and the choices of axes and constants that ensure that a...

299

Phase diagram of hot quark matter under magnetic field  

Science Conference Proceedings (OSTI)

I review the computation of the phase diagram of hot quark matter in strong magnetic field, at zero baryon density, within an effective model of Quantum Chromodynamics.

Ruggieri, Marco [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

2010-12-22T23:59:59.000Z

300

Appendix I. Using PANDAT to Calculate Phase Diagrams  

Science Conference Proceedings (OSTI)

After installing the software PANDAT in a personal computer (PC) and loading a thermodynamic database of interest, we can start to calculate phase diagrams.

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Binary Equilibrium Phase Diagrams and the Third Law of ...  

Science Conference Proceedings (OSTI)

I will make suggestions of probable configurations of binary phase diagrams at low temperatures. This leads to an expansion of the concept of improbable...

302

Commercial Alloy Phase Diagrams and Their Industrial Applications  

Science Conference Proceedings (OSTI)

A phase diagram thus plays an important role in understanding the microstructure developed and the ultimate performance of a material. In this presentation, we...

303

Active and Passive Remote Sensing Diagram | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Active and Passive Remote Sensing Diagram Citation National Aeronautics and...

304

Combinatorics of Arc Diagrams, Ferrers Fillings, Young ... - CECM  

E-Print Network (OSTI)

Jul 22, 2009 ... I Generalization of permutation matrices: fill each row & column of a Ferrers shape ... Standard Young Tableaux. Arc Diagrams,. Nesting and.

305

Alaska NAD 83 Official Protraction Diagram (OPD) Outlines | Data...  

NLE Websites -- All DOE Office Websites (Extended Search)

NAD 83 Official Protraction Diagram (OPD) Outlines Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean ...

306

Alaska NAD 83 Official Protraction Diagram (OPD) Outlines (clipped...  

NLE Websites -- All DOE Office Websites (Extended Search)

Official Protraction Diagram (OPD) Outlines (clipped) Ocean Data Tools Technical Guide Map Gallery Regional Planning Feedback Ocean You are here Data.gov Communities Ocean ...

307

Conformal and projection diagrams in LaTeX  

E-Print Network (OSTI)

In general relativity, the causal structure of space-time may sometimes be depicted by conformal Carter-Penrose diagrams or a recent extension of these - the projection diagrams. The introduction of conformal diagrams in the sixties was one of the progenitors of the golden age of relativity. They are the key ingredient of many scientific papers. Unfortunately, drawing them in the form suitable for LaTeX documents is time-consuming and not easy. We present below a library that allows one to draw an arbitrary conformal diagram in a few simple steps.

Christa R. lz; Sebastian J. Szybka

2013-05-09T23:59:59.000Z

308

Recirculating rotary gas compressor  

DOE Patents (OSTI)

A positive displacement, recirculating Roots-type rotary gas compressor is described which operates on the basis of flow work compression. The compressor includes a pair of large diameter recirculation conduits which return compressed discharge gas to the compressor housing, where it is mixed with low pressure inlet gas, thereby minimizing adiabatic heating of the gas. The compressor includes a pair of involutely lobed impellers and an associated port configuration which together result in uninterrupted flow of recirculation gas. The large diameter recirculation conduits equalize gas flow velocities within the compressor and minimize gas flow losses. The compressor is particularly suited to applications requiring sustained operation at higher gas compression ratios than have previously been feasible with rotary pumps, and is particularly applicable to refrigeration or other applications requiring condensation of a vapor. 12 figs.

Weinbrecht, J.F.

1992-02-25T23:59:59.000Z

309

Recirculating rotary gas compressor  

DOE Patents (OSTI)

A positive displacement, recirculating Roots-type rotary gas compressor which operates on the basis of flow work compression. The compressor includes a pair of large diameter recirculation conduits (24 and 26) which return compressed discharge gas to the compressor housing (14), where it is mixed with low pressure inlet gas, thereby minimizing adiabatic heating of the gas. The compressor includes a pair of involutely lobed impellers (10 and 12) and an associated port configuration which together result in uninterrupted flow of recirculation gas. The large diameter recirculation conduits equalize gas flow velocities within the compressor and minimize gas flow losses. The compressor is particularly suited to applications requiring sustained operation at higher gas compression ratios than have previously been feasible with rotary pumps, and is particularly applicable to refrigeration or other applications requiring condensation of a vapor.

Weinbrecht, John F. (601 Oakwood Loop, NE., Albuquerque, NM 87123)

1992-01-01T23:59:59.000Z

310

Determination of filter-cake thicknesses from on-line flow measurements and gas/particle transport modeling  

SciTech Connect

The use of cylindrical candle filters to remove fine ({approx}0.005 mm) particles from hot ({approx}500- 900{degrees}C) gas streams currently is being developed for applications in advanced pressurized fluidized bed combustion (PFBC) and integrated gasification combined cycle (IGCC) technologies. Successfully deployed with hot-gas filtration, PFBC and IGCC technologies will allow the conversion of coal to electrical energy by direct passage of the filtered gases into non-ruggedized turbines and thus provide substantially greater conversion efficiencies with reduced environmental impacts. In the usual approach, one or more clusters of candle filters are suspended from a tubesheet in a pressurized (P {approx_lt}1 MPa) vessel into which hot gases and suspended particles enter, the gases pass through the walls of the cylindrical filters, and the filtered particles form a cake on the outside of each filter. The cake is then removed periodically by a backpulse of compressed air from inside the filter, which passes through the filter wall and filter cake. In various development or demonstration systems the thickness of the filter cake has proved to be an important, but unknown, process parameter. This paper describes a physical model for cake and pressure buildups between cleaning backpulses, and for longer term buildups of the ``baseline`` pressure drop, as caused by incomplete filter cleaning and/or re-entrainment. When combined with operating data and laboratory measurements of the cake porosity, the model may be used to calculate the (average) filter permeability, the filter-cake thickness and permeability, and the fraction of filter-cake left on the filter by the cleaning backpulse or re-entrained after the backpulse. When used for a variety of operating conditions (e.g., different coals, sorbents, temperatures, etc.), the model eventually may provide useful information on how the filter-cake properties depend on the various operating parameters.

Smith, D.H.; Powell, V. [USDOE Morgantown Energy Technology Center, WV (United States); Ibrahim, E. [Oak Ridge Inst. for Science and Education, TN (United States); Ferer, M. [West Virginia Univ., Morgantown, WV (United States). Dept. of Physics; Ahmadi, G. [National Research Council, Washington, DC (United States)

1996-12-31T23:59:59.000Z

311

Gas pressure reduction circuits  

Science Conference Proceedings (OSTI)

This note describes passive pressure reduction devices for use with sensitive instruments. Two gas circuits are developed which not only provide a pressure reduction under flow demand

D. W. Guillaume; D. DeVries

1989-01-01T23:59:59.000Z

312

Signed enumeration of ribbon tableaux: an approach through growth diagrams  

Science Conference Proceedings (OSTI)

We give an extension of the famous Schensted correspondence to the case of ribbon tableaux, where ribbons are allowed to be of different sizes. This is done by extending Fomin's growth diagram approach of the classical correspondence, in particular by ... Keywords: Garsia---Milne involution principle, Growth diagrams, Murnaghan---Nakayama rule, RSK correspondence, Ribbon tableaux

Dominique Gouyou-Beauchamps; Philippe Nadeau

2012-08-01T23:59:59.000Z

313

QCD Phase Diagram Using Dyson-Schwinger Equations  

Science Conference Proceedings (OSTI)

We describe briefly the Dyson-Schwinger equation approach of QCD and the study of the QCD phase diagram in this approach. The phase diagram in terms of the temperature and chemical potential, and that in the space of coupling strength and current-quark mass are given.

Liu Yuxin; Qin Sixue; Chang Lei [Department of Physics, Center for High Energy Physics and the State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China); Roberts, Craig D. [Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Department of Physics, Center for High Energy Physics and the State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)

2011-05-24T23:59:59.000Z

314

Recall the diagrams we saw before: Screen1Screen1  

E-Print Network (OSTI)

Customer EnterOrder customers orders buttons · When we trace through the diagram there are a number of keyX-machines · Recall the diagrams we saw before: Start Customers Orders Screen1Screen1 Screen2 Customers Screen Screen2 Customers Screen Screen3 Orders Screen Screen3 Orders Screen ClickCustomer Click

Holcombe, Mike

315

Dynamic minimization of word-level decision diagrams  

Science Conference Proceedings (OSTI)

Word-Level Decision Diagrams (WLDDs), like *BMDs and K*BMDs, have recently been introduced as a data structure for verification. The size of WLDDs largely depends on the chosen variable ordering, i.e. the ordering in which variables are encountered, ... Keywords: decision diagrams, word-level, variable exchange, reordering, sifting, hybrid graph manipulation, K*BMDs

S. Hreth; R. Drechsler

1998-02-01T23:59:59.000Z

316

Debugging Concurrent Software: A Study Using Multithreaded Sequence Diagrams  

Science Conference Proceedings (OSTI)

Concurrent software is notoriously difficult to debug. We investigate the use of UML sequence diagrams to help developers correctly reason about the potential behaviors of buggy concurrent software. We conducted a controlled experiment that compared ... Keywords: concurrent software, empirical software engineering, UML sequence diagrams

Scott D. Fleming; Eileen Kraemer; R. E. K. Stirewalt; Laura K. Dillon

2010-09-01T23:59:59.000Z

317

The predicates for the Voronoi diagram of ellipses  

Science Conference Proceedings (OSTI)

This paper examines the computation of the Voronoi diagram of a set of ellipses in the Euclidean plane. We propose the first complete algorithms, under the exact computation paradigm, for the predicates of an incremental algorithm: ?1 ... Keywords: Euclidean distance, Voronoi diagram, bisector, ellipse, exact computation, parametric representation, predicate

Ioannis Z. Emiris; Elias P. Tsigaridas; George M. Tzoumas

2006-06-01T23:59:59.000Z

318

Elbow mass flow meter  

DOE Patents (OSTI)

The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity. 3 figs.

McFarland, A.R.; Rodgers, J.C.; Ortiz, C.A.; Nelson, D.C.

1994-08-16T23:59:59.000Z

319

Improving perturbation theory with cactus diagrams  

E-Print Network (OSTI)

We study a systematic improvement of perturbation theory for gauge fields on the lattice [hep-lat/0606001]; the improvement entails resumming, to all orders in the coupling constant, a dominant subclass of tadpole diagrams. This method, originally proposed for the Wilson gluon action, is extended here to encompass all possible gluon actions made of closed Wilson loops; any fermion action can be employed as well. The effect of resummation is to replace various parameters in the action (coupling constant, Symanzik and clover coefficient) by ``dressed'' values; the latter are solutions to certain coupled integral equations, which are easy to solve numerically. Some positive features of this method are: a) It is gauge invariant, b) it can be systematically applied to improve (to all orders) results obtained at any given order in perturbation theory, c) it does indeed absorb in the dressed parameters the bulk of tadpole contributions. Two different applications are presented: The additive renormalization of fermion masses, and the multiplicative renormalization Z_V (Z_A) of the vector (axial) current. In many cases where non-perturbative estimates of renormalization functions are also available for comparison, the agreement with improved perturbative results is consistently better as compared to results from bare perturbation theory.

Martha Constantinou; Haralambos Panagopoulos; Apostolos Skouroupathis

2006-12-04T23:59:59.000Z

320

Natural Gas Processing Plants in the United States: 2010 Update...  

Gasoline and Diesel Fuel Update (EIA)

3. Natural Gas Processing Plants Utilization Rates Based on 2008 Flows Figure 3. Natural Gas Processing Plants Utilization Rates Based on 2008 Flows Note: Average utilization rates...

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Definition: Gas Flux Sampling | Open Energy Information  

Open Energy Info (EERE)

Gas Flux Sampling Jump to: navigation, search Dictionary.png Gas Flux Sampling Gas flux sampling measures the flow of volatile gas emissions from a specific location and compares...

322

Gas turbine engine braking and method  

SciTech Connect

A method is described of decelerating a ground vehicle driven by a gas turbine engine having a gas generator section and a free turbine output power section driven by a gas flow from the gas generator section, comprising the steps of: altering the incidence of gas flow from the gas generator section onto the free turbine section whereby said gas flow opposes rotation of the free turbine section; increasing gas generator section speed; and subsequent to said altering and increasing steps, selectively mechanically interconnecting said gas generator and free turbine sections whereby the rotational inertia of the gas generator section tends to decelerate the free turbine section.

Mattson, G.; Woodhouse, G.

1980-07-01T23:59:59.000Z

323

High-Resolution Diagrams Now Available | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

every diagram you see will include options for downloading either a JPG or EPS file in a ZIP compressed format. Here's an example of the Active, Closed Loop Solar Water Heater...

324

CSL Model Checking of Biochemical Networks with Interval Decision Diagrams  

Science Conference Proceedings (OSTI)

This paper presents an Interval Decision Diagram based approach to symbolic CSL model checking of Continuous Time Markov Chains which are derived from stochastic Petri nets. Matrix-vector and vector-matrix multiplication are the major tasks of exact ...

Martin Schwarick; Monika Heiner

2009-08-01T23:59:59.000Z

325

Anisotropy and Forming Limit Diagram Comparison of DC and CC ...  

Science Conference Proceedings (OSTI)

Presentation Title, Anisotropy and Forming Limit Diagram Comparison of DC and CC ... Advanced Experimental Grid Pattern Techniques Coupled with FE-analysis ... Effect of Exploitation Overhead Power Lines on the Evolution of Mechanical...

326

Mechanised Translation of Control Law Diagrams into Circus  

Science Conference Proceedings (OSTI)

Previously we proposed a strategy for translating control law diagrams into Circus . Combining elements from Z, CSP, and a refinement calculus,

Frank Zeyda; Ana Cavalcanti

2009-02-01T23:59:59.000Z

327

Efficient Decompositional Model-Checking for Regular Timing Diagrams  

E-Print Network (OSTI)

There is a growing need to make verification tools easier to use. A solution that does not require redesigning the tool is to construct front-ends providing specification notations that are close to those used in practice. Timing diagrams are such a widely used graphical notation, one that is often more appealing than a "linear" textual notation. This paper introduces a class of timing diagrams called Regular Timing Diagrams (RTDs). RTDs have a precise syntax and a formal semantics that is simple and corresponds to common usage. In addition, RTDs have an inherent compositional structure, which is exploited to provide an efficient algorithm for model-checking an RTD with respect to a system description. The algorithm has time complexity that is a small polynomial in the size of the diagram and linear in the size of the structure. We demonstrate the applicability of our algorithms by verifying that a master-slave system satisfies its specification RTDs.

Nina Amla; E. Allen Emerson; Kedar S. Namjoshi

1999-01-01T23:59:59.000Z

328

CD2Alloy: class diagrams analysis using alloy revisited  

Science Conference Proceedings (OSTI)

We present CD2Alloy, a novel, powerful translation of UML class diagrams (CDs) to Alloy. Unlike existing translations, which are based on a shallow embedding strategy, and are thus limited to checking consistency and generating conforming object models ...

Shahar Maoz; Jan Oliver Ringert; Bernhard Rumpe

2011-10-01T23:59:59.000Z

329

Thermodynamic Budget Diagrams for the Hurricane Subcloud Layer  

Science Conference Proceedings (OSTI)

We reexamine the idealized hurricane boundary layer budget from Malkus and Riehl using vector diagrams for the thermodynamic budgets in the light of recent observations studies. We conclude that a large air-sea temperature difference can only be ...

Alan K. Betts; Joanne Simpson

1987-03-01T23:59:59.000Z

330

HP-67 CALCULATOR PROGRAMS FOR THERMODYNAMIC DATA AND PHASE DIAGRAM CALCULATIONS  

E-Print Network (OSTI)

Selected Values of the Thermodynamic Properties of theI-, Estimation of Thermodynamic D.ata and Phase Diagrams. ,CALCULATOR PROGRAMS FOR THERMODYNAMIC DATA AND PHASE DIAGRAM

Brewer, Leo

2010-01-01T23:59:59.000Z

331

Quantum Cascade Laser Energy Band Diagram  

E-Print Network (OSTI)

Quantum Cascade Lasers (QCLs) are semiconductor lasers that emit in the mid- and long-wave IR bands, and are fi nding new applications in precision sensing, spectroscopy, medical, and military applications (1). Their wide tuning range and fast response time allow for faster and more precise compact trace element detectors and gas analyzers that are replacing slower and larger FTIR, mass spectroscopy, and photothermal microspectroscopy systems. Figure 1 represents the physics behind Quantum Cascade Lasers. It depicts the laser energy bands that allow QC lasing. For more information about QCLs and the physics behind

unknown authors

2013-01-01T23:59:59.000Z

332

4. Trends in Natural Gas Transportation Rates  

U.S. Energy Information Administration (EIA)

Energy Information Administration 39 Energy Policy Act Transportation Study: Interim Report on Natural Gas Flows and Rates 4. Trends in Natural Gas Transportation Rates

333

Pion condensation in a dense neutrino gas  

E-Print Network (OSTI)

We argue that using an equilibrated gas of neutrinos it is possible to probe the phase diagram of QCD for finite isospin and small baryon chemical potentials. We discuss this region of the phase diagram in detail and demonstrate that for large enough neutrino densities a Bose-Einstein condensate of positively charged pions arises. Moreover, we show that for nonzero neutrino density the degeneracy in the lifetimes and masses of the charged pions is lifted.

Hiroaki Abuki; Tomas Brauner; Harmen J. Warringa

2009-01-16T23:59:59.000Z

334

A process for off-gas particulate removal  

DOE Patents (OSTI)

This paper describes an off-gas system for the removal of radioactive particulates from a melter for the vitrification of radioactive wastes to form glass waste forms. A diagram is provided.

Carl, D.E.

1998-04-01T23:59:59.000Z

335

The phase diagram of nuclear and quark matter at high baryon density  

E-Print Network (OSTI)

We review theoretical approaches to explore the phase diagram of nuclear and quark matter at high baryon density. We first look over the basic properties of quantum chromodynamics (QCD) and address how to describe various states of QCD matter. In our discussions on nuclear matter we cover the relativistic mean-field model, the chiral perturbation theory, and the approximation based on the large-Nc limit where Nc is the number of colors. We then explain the liquid-gas phase transition and the inhomogeneous meson condensation in nuclear matter with emphasis put on the relevance to quark matter. We commence the next part focused on quark matter with the bootstrap model and the Hagedorn temperature. Then we turn to properties associated with chiral symmetry and exposit theoretical descriptions of the chiral phase transition. There emerge some quark-matter counterparts of phenomena seen in nuclear matter such as the liquid-gas phase transition and the inhomogeneous structure of the chiral condensate. The third regime that is being recognized recently is what is called quarkyonic matter, which has both aspects of nuclear and quark matter. We closely elucidate the basic idea of quarkyonic matter in the large-Nc limit and its physics implications. Finally, we discuss some experimental indications for the QCD phase diagram and close the review with outlooks.

Kenji Fukushima; Chihiro Sasaki

2013-01-27T23:59:59.000Z

336

Modeling the motion of a hot, turbulent gas  

Science Conference Proceedings (OSTI)

Keywords: animation, convection, gas simulations, gaseous phenomena, physics-based modeling, smoke, steam, turbulent flow

Nick Foster; Dimitris Metaxas

1997-08-01T23:59:59.000Z

337

Gas laser  

SciTech Connect

According to the invention, the gas laser comprises a housing which accommodates two electrodes. One of the electrodes is sectional and has a ballast resistor connected to each section. One of the electrodes is so secured in the housing that it is possible to vary the spacing between the electrodes in the direction of the flow of a gas mixture passed through an active zone between the electrodes where the laser effect is produced. The invention provides for a maximum efficiency of the laser under different operating conditions.

Kosyrev, F. K.; Leonov, A. P.; Pekh, A. K.; Timofeev, V. A.

1980-08-12T23:59:59.000Z

338

EM Pnictide Phase Diagram - Argonne National Laboratories, Materials  

NLE Websites -- All DOE Office Websites (Extended Search)

Materials > EM Pnictide Materials > EM Pnictide Phase Diagram Phase Diagram of Ba1-xKxFe2As2 Structural, magnetic, and superconducting phase diagram of Ba1-xK1-xFe2As2. Published May 7, 2012 The role of internal structural parameters that influence the band structure and the degree of moment localization in optimizing superconductivity and the implications for the gap symmetry in Ba1-xKxFe2As2 remains a matter of debate. Controlling the inhomogeneity to within acceptable limits to improve the accuracy of structural, magnetic, and superconducting phase boundaries has been a key goal of this work. We estimate that we have been able to synthesize samples for which Δx <0.01, suitable for systematic investigation using high-resolution neutron and x-ray diffraction combined with magnetization measurements.

339

Photon capture cones and embedding diagrams of the Ernst spacetime  

E-Print Network (OSTI)

The differences between the character of the Schwarzschild and Ernst spacetimes are illustrated by comparing the photon capture cones, and the embedding diagrams of the $t=\\mathrm{const}$ sections of the equatorial planes of both the ordinary and optical reference geometry of these spacetimes. The non-flat asymptotic character of the Ernst spacetime reflects itself in two manifest facts: the escape photon cones correspond to purely outward radial direction, and the embedding diagrams of both the ordinary and optical geometry shrink to zero radius asymptotically. Using the properties of the embedding diagrams, regions of these spacetimes which could have similar character are estimated, and it is argued that they can exist for the Ernst spacetimes with a sufficiently low strength of the magnetic field.

Zden?k Stuchlk; Stanislav Hledk

2008-03-17T23:59:59.000Z

340

Project Management Plan for the INEL technology logic diagrams  

SciTech Connect

This Project Management Plan (PjMP) describes the elements of project planning and control that apply to activities outlined in Technical Task Plan (TTP) ID-121117, ``Technology Logic Diagrams For The INEL.`` The work on this project will be conducted by personnel in EG&G Idaho, Inc.`s Waste Technology Development Program. Technology logic diagrams represent a formal methodology to identify technology gaps or needs within Environmental Restoration/Waste Management Operations, which will focus on Office of Environmental Restoration and Waste Management (EM-50) research and development, demonstration, test, and evaluation efforts throughout the US Department of Energy complex. This PjMP describes the objectives, organization, roles and responsibilities, workscope and processes for implementing and managing the technology logic diagram for the Idaho National Engineering Laboratory project.

Rudin, M.J.

1992-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Project Management Plan for the INEL technology logic diagrams  

SciTech Connect

This Project Management Plan (PjMP) describes the elements of project planning and control that apply to activities outlined in Technical Task Plan (TTP) ID-121117, Technology Logic Diagrams For The INEL.'' The work on this project will be conducted by personnel in EG G Idaho, Inc.'s Waste Technology Development Program. Technology logic diagrams represent a formal methodology to identify technology gaps or needs within Environmental Restoration/Waste Management Operations, which will focus on Office of Environmental Restoration and Waste Management (EM-50) research and development, demonstration, test, and evaluation efforts throughout the US Department of Energy complex. This PjMP describes the objectives, organization, roles and responsibilities, workscope and processes for implementing and managing the technology logic diagram for the Idaho National Engineering Laboratory project.

Rudin, M.J.

1992-10-01T23:59:59.000Z

342

Phase diagram of the lattice SU(2) Higgs model  

E-Print Network (OSTI)

We perform a detailed study of the phase diagram of the lattice Higgs SU(2) model with fixed Higgs field length. Consistently with previsions based on the Fradkin Shenker theorem we find a first order transition line with an endpoint whose position we determined. The diagram also shows cross-over lines: the cross-over corresponding to the pure SU(2) bulk is also present at nonzero coupling with the Higgs field and merges with the one that continues the line of first order transition beyond the critical endpoint. At high temperature the first order line becomes a crossover, whose position moves by varying the temperature.

C. Bonati; G. Cossu; M. D'Elia; A. Di Giacomo

2009-11-09T23:59:59.000Z

343

Gas-recovery system  

DOE Patents (OSTI)

Nuclear explosions have been proposed as a means for recovering gas from underground gas-bearing rock formations. In present practice, the nuclear device is positioned at the end of a long pipe which is subsequently filled with grout or concrete. After the device is exploded, the grout is drilled through to provide a flow path for the released gas to the ground surface. As settled grout is brittle, often the compressive shock of the explosion fractures the grout and deforms the pipe so that it may not be removed nor reused. In addition, the pipe is sometimes pinched off completely and the gas flow is totally obstructed. (2 claims)

Heckman, R.A.

1971-12-14T23:59:59.000Z

344

A heat exchanger between forced flow helium gas at 14 to 18 K and liquid hydrogen at 20 K circulated by natural convection  

E-Print Network (OSTI)

LBNL-53719 A HEAT EXCHANGER BETWEEN FORCED FLOW HELIUM GAShydrogen absorber and the heat exchanger between the liquidpasses through the heat exchanger in the absorber shell. The

Green, M.A.; Ishimoto, S.; Lau, W.; Yang, S.

2003-01-01T23:59:59.000Z

345

Sauget Plant Flare Gas Reduction Project  

E-Print Network (OSTI)

Empirical analysis of stack gas heating value allowed the Afton Chemical Corporation Sauget Plant to reduce natural gas flow to its process flares by about 50% while maintaining the EPA-required minimum heating value of the gas streams.

Ratkowski, D. P.

2007-01-01T23:59:59.000Z

346

The impact of meridional circulation on stellar butterfly diagrams and polar caps  

E-Print Network (OSTI)

Observations of rapidly rotating solar-like stars show a significant mixture of opposite-polarity magnetic fields within their polar regions. To explain these observations, models describing the surface transport of magnetic flux demand the presence of fast meridional flows. Here, we link sub-surface and surface magnetic flux transport simulations to investigate (i) the impact of meridional circulations with peak velocities of <125m/s on the latitudinal eruption pattern of magnetic flux tubes and (ii) the influence of the resulting butterfly diagrams on polar magnetic field properties. Prior to their eruption, magnetic flux tubes with low field strengths and initial cross sections below about 300km experience an enhanced poleward deflection through meridional flows. In particular flux tubes which originate between low and intermediate latitudes within the convective overshoot region are strongly affected. This latitude-dependent poleward deflection of erupting magnetic flux renders the wings of stellar butterfly diagrams distinctively convex. The subsequent evolution of the surface magnetic field shows that the increased number of newly emerging bipoles at higher latitudes promotes the intermingling of opposite polarities of polar magnetic fields. The associated magnetic flux densities are about 20% higher than in the case disregarding the pre-eruptive deflection, which eases the necessity for fast meridional flows predicted by previous investigations. In order to reproduce the observed polar field properties, the rate of the meridional circulation has to be on the order of 100m/s, and the latitudinal range from which magnetic flux tubes originate at the base of the convective zone (<50degrees) must be larger than in the solar case (<35degrees).

V. Holzwarth; D. H. Mackay; M. Jardine

2006-04-05T23:59:59.000Z

347

Guidelines on the aesthetic quality of UML class diagrams  

Science Conference Proceedings (OSTI)

In the past, formatting guidelines have proved to be a successful method to improve the readability of source code. With the increasing success of visual specification languages such as UML for model-driven software engineering visual guidelines are ... Keywords: Aesthetic quality, Automatic layout, Layout guidelines, Modeling tools, Software engineering, UML class diagrams

Holger Eichelberger; Klaus Schmid

2009-12-01T23:59:59.000Z

348

Project Title Economic Modeling & Unconventional Gas Resource Appraisal Program Line Tough Gas  

E-Print Network (OSTI)

support to assess the economic viability of new tough gas plays (tight gas, shale gas, CBM). Project are illustrated using the US shale gas plays as case templates. Discounted cash flow models are applied1 Project Title Economic Modeling & Unconventional Gas Resource Appraisal Program Line Tough Gas

Santos, Juan

349

Lattice Boltzmann modeling of microchannel flow in slip flow regime  

Science Conference Proceedings (OSTI)

We present the lattice Boltzmann equation (LBE) with multiple relaxation times (MRT) to simulate pressure-driven gaseous flow in a long microchannel. We obtain analytic solutions of the MRT-LBE with various boundary conditions for the incompressible ... Keywords: Gas flow through microchannel, Lattice Boltzmann equation with multiple relaxation times, Slip flow

Frederik Verhaeghe; Li-Shi Luo; Bart Blanpain

2009-01-01T23:59:59.000Z

350

Microsoft Word - PMCDP Knowledge Diagram Updates March 26 2009.doc  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

(PMCDP) KNOWLEDGE DIAGRAM (PMCDP) KNOWLEDGE DIAGRAM Certification is based on competencies and is cumulative. For example, to fulfill requirements for Level 3, competency requirements for Levels 1, 2, and 3 must be attained. 1 Competency (Knowledge/Skill) Category Project Director Level Core Courses, Electives, and Work/Development Activities 1. General Project Management 2. Leadership / Team Building 3. Scope Management 4. Communication Management 5. Quality / Safety Management 6. Cost Management 7. Time Management 8. Risk Management 9. Contract Management 10. Integration Management PM Level 1 FPD for projects with TPC Greater than $5M and equal to or less than $20 million Core Courses: 1. Project Management Essentials* 2. Project Management Systems and Practices in DOE

351

Microsoft Word - Knowledge Diagram 4_30_2008.doc  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

PMCDP) KNOWLEDGE DIAGRAM PMCDP) KNOWLEDGE DIAGRAM Certification is based on competencies and is cumulative. For example, to fulfill requirements for Level 3, competency requirements for Levels 1, 2, and 3 must be attained. Competency (Knowledge/Skill) Category Project Director Level Core Courses, Electives, and Work/Development Activities 1. General Project Management 2. Leadership / Team Building 3. Scope Management 4. Communication Management 5. Quality / Safety Management 6. Cost Management 7. Time Management 8. Risk Management 9. Contract Management 10. Integration Management PM Level 1 FPD for projects with TPC Greater than $5M and equal to or less than $20 million Core Courses: 1. Project Management (PM) Essentials* 2. Project Management Systems and Practices in DOE

352

Effects of photon escape on diagnostic diagrams for HII regions  

E-Print Network (OSTI)

In this article we first outline the mounting evidence that a significant fraction of the ionizing photons emitted by OB stars within HII regions escape from their immediate surroundings and explain how an HII region structure containing high density contrast in homogeneities facilitates this escape. Next we describe sets of models containing inhomogeneities which are used to predict tracks in the commonly used diagnostic diagrams (based on ratios of emission lines) whose only independent variable is the photon escape fraction, xi. We show that the tracks produced by the models in two of the most cited of these diagrams conform well to the distribution of observed data points, with the models containing optically thick inhomogeneities ("CLUMPY" models) yielding somewhat better agreement than those with optically thin inhomogeneities ("FF" models). We show how variations in the ionization parameter U, derived from emission line ratios, could be due to photon escape. Using a rather wide range of assumptions abo...

Giammanco, C; Cedres, B

2005-01-01T23:59:59.000Z

353

Oak Ridge K-25 Site Technology Logic Diagram  

Science Conference Proceedings (OSTI)

The Oak Ridge K-25 Technology Logic Diagram (TLD), a decision support tool for the K-25 Site, was developed to provide a planning document that relates environmental restoration and waste management problems at the Oak Ridge K-25 Site to potential technologies that can remediate these problems. The TLD technique identifies the research necessary to develop these technologies to a state that allows for technology transfer and application to waste management, remedial action, and decontamination and decommissioning activities. The TLD consists of four separate volumes-Vol. 1, Vol. 2, Vol. 3A, and Vol. 3B. Volume 1 provides introductory and overview information about the TLD. Volume 2 contains logic diagrams. Volume 3 has been divided into two separate volumes to facilitate handling and use. This report is part A of Volume 3 concerning characterization, decontamination, and dismantlement.

Fellows, R.L. (ed.)

1993-02-26T23:59:59.000Z

354

ARTICLE IN PRESS Computer Coupling of Phase Diagrams and Thermochemistry ( )  

E-Print Network (OSTI)

review 2.1. Ni­Y system The phase diagram of the Ni­Y system was first investigated by Beaudry and Daane Ni-rich intermediate phase reporting the composition to be Ni9Y not Ni17Y2. Studying the crystal with a molten salt galvanic cell. Also, there is a reasonable agreement between the current work and Schmahl

Medraj, Mamoun

355

On the QCD phase diagram at finite chemical potential  

SciTech Connect

We present results for the phase diagram of QCD with two massless quark flavours as obtained from a first-principles functional renormalisation group approach. In particular we compute order parameters for chiral symmetry breaking and quark confinement at vanishing and non-zero imaginary chemical potential. Our analytical and numerical results suggest a close relation between the chiral and the deconfinement phase transition. We discuss the properties of dual order parameters at imaginary and real chemical potential.

Haas, Lisa M.; Pawlowski, Jan M. [Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany); ExtreMe Matter Institute EMMI, GSI, Planckstr. 1, 64291 Darmstadt (Germany); Braun, Jens [Theoretisch-Physikalisches Institut, Universitaet Jena, Max-Wien-Platz 1, 07743 Jena (Germany)

2011-05-23T23:59:59.000Z

356

Possible Orientation Effects to Phase Diagram of Strange Matter  

E-Print Network (OSTI)

We obtain possibly valuable information about the orientation-tuning of phase diagram of superdense nuclear matter at high fermion as well as boson number density but low temperature, which is not accessible to relativistic heavy ion collision experiments. Our results resemble those proposed before by Alford. Possible observational signatures associated with the theoretically proposed states of matter inside compact stars are discussed as well.

Kwang-Hua W. Chu

2006-09-21T23:59:59.000Z

357

TITLE OF THE CD (English): OIML R 137-1 and -2 Gas meters ...  

Science Conference Proceedings (OSTI)

... gas meters only) volume of gas corresponding to one full revolution of the ... 5.11 Overload flow Gas meters with internal moving parts shall meet the ...

2010-10-21T23:59:59.000Z

358

AN ANALYSIS OF THE MOTION OF PIGS THROUGH NATURAL GAS PIPELINES.  

E-Print Network (OSTI)

??The dynamics of propelling a pig through a natural gas pipeline, using the gas being transported, are analyzed. The gas flow is assumed to be (more)

Sullivan, Jean

2011-01-01T23:59:59.000Z

359

Libya resumes natural gas exports to Italy - Today in Energy - U.S ...  

U.S. Energy Information Administration (EIA)

Italy offset much of the reduced natural gas imports from Libya with increased imports of natural gas from Russia. After natural gas flows resumed following the ...

360

Multiphase Turbulent Flow Ken Kiger -UMCP  

E-Print Network (OSTI)

of the dispersion: · Size & geometry · Volume fraction #12;Bubbly Pipe Flow ­ heat exchangers in power plants, A/C units Gas-Liquid Flow #12;Aeration: -produced by wave action - used as reactor in chemical processing delivery Liquid-Gas Flow http://www.mywindpowersystem.com/2009/07/wind-power-when-nature

Gruner, Daniel S.

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Gas only nozzle  

DOE Patents (OSTI)

A diffusion flame nozzle gas tip is provided to convert a dual fuel nozzle to a gas only nozzle. The nozzle tip diverts compressor discharge air from the passage feeding the diffusion nozzle air swirl vanes to a region vacated by removal of the dual fuel components, so that the diverted compressor discharge air can flow to and through effusion holes in the end cap plate of the nozzle tip. In a preferred embodiment, the nozzle gas tip defines a cavity for receiving the compressor discharge air from a peripheral passage of the nozzle for flow through the effusion openings defined in the end cap plate.

Bechtel, William Theodore (15 Olde Coach Rd., Scotia, NY 12302); Fitts, David Orus (286 Sweetman Rd., Ballston Spa, NY 12020); DeLeonardo, Guy Wayne (60 St. Stephens La., Glenville, NY 12302)

2002-01-01T23:59:59.000Z

362

A CSP View on UMLRT structure diagrams Clemens Fischer, ErnstRudiger Olderog and Heike Wehrheim  

E-Print Network (OSTI)

A CSP View on UML­RT structure diagrams Clemens Fischer, Ernst­R¨udiger Olderog and Heike Wehrheim UML­RT structure diagrams together with the formal method CSP­OZ combining CSP and Object­Z. While CSP­OZ is used for specifying the system components themselves (by CSP­OZ classes), UML­RT diagrams provide

Olderog, Ernst-Rüdiger

363

Query Processing for Probabilistic State Diagrams Describing Multiple Robot Navigation in an Indoor Environment  

SciTech Connect

This paper describes the syntax and semantics of multi-level state diagrams to support probabilistic behavior of cooperating robots. The techniques are presented to analyze these diagrams by querying combined robots behaviors. It is shown how to use state abstraction and transition abstraction to create, verify and process large probabilistic state diagrams.

Czejdo, Bogdan [ORNL; Bhattacharya, Sambit [North Carolina Fayetteville State University; Ferragut, Erik M [ORNL

2012-01-01T23:59:59.000Z

364

U.S. Natural Gas Imports & Exports 2012 - Energy Information ...  

U.S. Energy Information Administration (EIA)

In the face of unprecedented levels of domestic natural gas production, ... in New England that hinder natural gas flow from the Marcellus shale play and ...

365

New natural gas pipeline capacity adds service into Florida ...  

U.S. Energy Information Administration (EIA)

Source: U.S. Energy Information Administration based on BENTEK Energy, LLC Note: Daily natural gas flow data and daily pipeline capacity derived from Florida's Gas ...

366

Gas Flowmeter Calibrations with the 26 m PVTt Standard  

Science Conference Proceedings (OSTI)

... thermal mass flow meters, and turbine meters. ... Z , are well known for common gases (eg, air ... Universal Gas Constant The universal gas constant has ...

2013-06-08T23:59:59.000Z

367

BLOCKAGE DETECTION IN NATURAL GAS PIPELINES BY TRANSIENT ANALYSIS.  

E-Print Network (OSTI)

??Pipelines are the most reliable means for the transportation of natural gas. A major problem of flow assurance in natural gas pipelines is solid deposition (more)

ADELEKE, NAJEEM

2010-01-01T23:59:59.000Z

368

Gas Flux Sampling | Open Energy Information  

Open Energy Info (EERE)

Gas Flux Sampling Gas Flux Sampling Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Gas Flux Sampling Details Activities (26) Areas (20) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Field Techniques Exploration Sub Group: Field Sampling Parent Exploration Technique: Gas Sampling Information Provided by Technique Lithology: Stratigraphic/Structural: High flux can be indicative of conduits for fluid flow. Hydrological: Thermal: Anomalous flux is associated with active hydrothermal activity. Dictionary.png Gas Flux Sampling: Gas flux sampling measures the flow of volatile gas emissions from a specific location and compares it to average background emissions. Anomalously high gas flux can be an indication of hydrothermal activity.

369

Bosonic Loop Diagrams as Perturbative Solutions of the Classical Field Equations in $\\phi^4$-Theory  

E-Print Network (OSTI)

Solutions of the classical $\\phi^4$-theory in Minkowski space-time are analyzed in a perturbation expansion in the nonlinearity. Using the language of Feynman diagrams, the solution of the Cauchy problem is expressed in terms of tree diagrams which involve the retarded Green's function and have one outgoing leg. In order to obtain general tree diagrams, we set up a "classical measurement process" in which a virtual observer of a scattering experiment modifies the field and detects suitable energy differences. By adding a classical stochastic background field, we even obtain all loop diagrams. The expansions are compared with the standard Feynman diagrams of the corresponding quantum field theory.

Finster, Felix

2012-01-01T23:59:59.000Z

370

Supersonic gas compressor  

Science Conference Proceedings (OSTI)

A gas compressor based on the use of a driven rotor having a compression ramp traveling at a local supersonic inlet velocity (based on the combination of inlet gas velocity and tangential speed of the ramp) which compresses inlet gas against a stationary sidewall. In using this method to compress inlet gas, the supersonic compressor efficiently achieves high compression ratios while utilizing a compact, stabilized gasdynamic flow path. Operated at supersonic speeds, the inlet stabilizes an oblique/normal shock system in the gasdyanamic flow path formed between the rim of the rotor, the strakes, and a stationary external housing. Part load efficiency is enhanced by the use of a pre-swirl compressor, and using a bypass stream to bleed a portion of the intermediate pressure gas after passing through the pre-swirl compressor back to the inlet of the pre-swirl compressor. Inlet guide vanes to the compression ramp enhance overall efficiency.

Lawlor, Shawn P. (Bellevue, WA); Novaresi, Mark A. (San Diego, CA); Cornelius, Charles C. (Kirkland, WA)

2007-11-13T23:59:59.000Z

371

Selenium Removal by Iron Cementation from a Coal-Fired Power Plant Flue Gas Desulfurization Wastewater in a Continuous Flow System-- a Pilot Study  

Science Conference Proceedings (OSTI)

This technical update describes work funded by the Electric Power Research Institute (EPRI) and performed by MSE Technology Applications, Inc. (MSE) at a coal-fired power plant burning Powder River Basin (PRB) coal (identified in this report as Plant E). This work was based on encouraging results obtained during previous EPRI-funded work on flue gas desulfurization (FGD) wastewater treatability testing by MSE, which focused on selenium removal from a variety of FGD wastewater sources. The results from th...

2009-07-29T23:59:59.000Z

372

Gas-controlled dynamic vacuum insulation with gas gate  

DOE Patents (OSTI)

Disclosed is a dynamic vacuum insulation comprising sidewalls enclosing an evacuated chamber and gas control means for releasing hydrogen gas into a chamber to increase gas molecule conduction of heat across the chamber and retrieving hydrogen gas from the chamber. The gas control means includes a metal hydride that absorbs and retains hydrogen gas at cooler temperatures and releases hydrogen gas at hotter temperatures; a hydride heating means for selectively heating the metal hydride to temperatures high enough to release hydrogen gas from the metal hydride; and gate means positioned between the metal hydride and the chamber for selectively allowing hydrogen to flow or not to flow between said metal hydride and said chamber. 25 figs.

Benson, D.K.; Potter, T.F.

1994-06-07T23:59:59.000Z

373

Gas-controlled dynamic vacuum insulation with gas gate  

DOE Patents (OSTI)

Disclosed is a dynamic vacuum insulation comprising sidewalls enclosing an evacuated chamber and gas control means for releasing hydrogen gas into a chamber to increase gas molecule conduction of heat across the chamber and retrieving hydrogen gas from the chamber. The gas control means includes a metal hydride that absorbs and retains hydrogen gas at cooler temperatures and releases hydrogen gas at hotter temperatures; a hydride heating means for selectively heating the metal hydride to temperatures high enough to release hydrogen gas from the metal hydride; and gate means positioned between the metal hydride and the chamber for selectively allowing hydrogen to flow or not to flow between said metal hydride and said chamber.

Benson, David K. (Golden, CO); Potter, Thomas F. (Denver, CO)

1994-06-07T23:59:59.000Z

374

Magnetohydrodynamic Model Coupling Multiphase Flow in ...  

Science Conference Proceedings (OSTI)

Compact Filter Design for Gas Treatment Centers ... Gas-Solid Flow Applications for Powder Handling in Aluminum Smelters Processes ... Replacement of Damaged Electrical Insulators on Live Cross-Over Busbars inside a Tunnel: A...

375

QCD phase diagram at imaginary baryon and isospin chemical potentials  

E-Print Network (OSTI)

We explore the phase diagram of two-flavor QCD at imaginary values of baryon and isospin chemical potentials analyzing the thermodynamic potential of QCD analytically and that of the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model numerically. QCD has no pion condensation at imaginary baryon and isospin chemical potentials, and therefore has discrete symmetries that are not present at real baryon and isospin chemical potentials. The PNJL model possesses all the discrete symmetries. The PNJL model can reproduce qualitatively lattice QCD data presented very lately.

Sakai, Yuji; Yahiro, Masanobu

2009-01-01T23:59:59.000Z

376

ESPC Overview: Cash Flows, Scenarios, and Associated Diagrams for Energy Savings Performance Contracts  

Science Conference Proceedings (OSTI)

This document is meant to inform state and local decision makers about the process of energy savings performance contracts, and how projected savings and allocated energy-related budgets can be impacted by changes in utility prices.

Tetreault, T.; Regenthal, S.

2011-05-01T23:59:59.000Z

377

NETL: News Release - Keeping Deepwater Pipelines Flowing  

NLE Websites -- All DOE Office Websites (Extended Search)

remediation problem for offshore oil producers. Wax deposits can restrict the flow of crude oil and natural gas liquids, curtailing operations from offshore platforms that can...

378

Multiphase Flow and Cavern Abandonment in Salt  

Science Conference Proceedings (OSTI)

This report will explore the hypothesis that an underground cavity in gassy salt will eventually be gas filled as is observed on a small scale in some naturally occurring salt inclusions. First, a summary is presented on what is known about gas occurrences, flow mechanisms, and cavern behavior after abandonment. Then, background information is synthesized into theory on how gas can fill a cavern and simultaneously displace cavern fluids into the surrounding salt. Lastly, two-phase (gas and brine) flow visualization experiments are presented that demonstrate some of the associated flow mechanisms and support the theory and hypothesis that a cavity in salt can become gas filled after plugging and abandonment

Ehgartner, Brian; Tidwell, Vince

2001-02-13T23:59:59.000Z

379

Oak Ridge K-25 Site Technology Logic Diagram  

SciTech Connect

The Oak Ridge K-25 Technology Logic Diagram (TLD), a decision support tool for the K-25 Site, was developed to provide a planning document that relates environmental restoration (ER) and waste management (WN) problems at the Oak Ridge K-25 Site. The TLD technique identifies the research necessary to develop these technologies to a state that allows for technology transfer and application to waste management, remediation, decontamination, and decommissioning activities. The TLD consists of four separate volumes-Vol. 1, Vol. 2, Vol. 3A, and Vol. 3B. Volume 1 provides introductory and overview information about the TLD. Volume 2 contains logic diagrams. Volume 3 has been divided into two separate volumes to facilitate handling and use. This volume 3 B provides the Technology Evaluation Data Sheets (TEDS) for ER/WM activities (Remedial Action Robotics and Automation, Waste Management) that are referenced by a TEDS code number in Vol. 2 of the TLD. Each of these sheets represents a single logic trace across the TLD. These sheets contain more detail than each technology in Vol. 2. The TEDS are arranged alphanumerically by the TEDS code number in the upper right corner of each data sheet. Volume 3 can be used in two ways: (1) technologies that are identified from Vol. 2 can be referenced directly in Vol. 3 by using the TEDS codes, and (2) technologies and general technology areas (alternatives) can be located in the index in the front of this volume.

Fellows, R.L. (ed.)

1993-02-26T23:59:59.000Z

380

Oak Ridge K-25 Site Technology Logic Diagram  

SciTech Connect

The Oak Ridge K-25 Technology Logic Diagram (TLD), a decision support tool for the K-25 Site, was developed to provide a planning document that relates environmental restoration and waste management problems at the Oak Ridge K-25 Site to potential technologies that can remediate these problems. The TLD technique identifies the research necessary to develop these technologies to a state that allows for technology transfer and application to waste management, remedial action, and decontamination and decommissioning activities. The TLD consists of four separate volumes-Vol. 1, Vol. 2, Vol. 3A, and Vol. 3B. This Volume, Volume 1 provides introductory and overview information about the TLD. Volume 2 contains logic diagrams. Volume 3 has been divided into two separate volumes to facilitate handling and use. This volume is divided into ten chapters. The first chapter is a brief introduction, and the second chapter details the technical approach of the TLD. These categories are the work activities necessary for successful decontamination and decommissioning, waste management, and remedial action of the K-25 Site. The categories are characterization, decontamination, dismantlement, robotics and automation, remedial action, and waste management. Materials disposition is addressed in Chap. 9. The final chapter contains regulatory compliance information concerning waste management, remedial action, and decontamination and decommissioning.

Fellows, R.L. (ed.)

1993-02-26T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Pairing Functions, Boolean Evaluation and Binary Decision Diagrams  

E-Print Network (OSTI)

A ``pairing function'' J associates a unique natural number z to any two natural numbers x,y such that for two ``unpairing functions'' K and L, the equalities K(J(x,y))=x, L(J(x,y))=y and J(K(z),L(z))=z hold. Using pairing functions on natural number representations of truth tables, we derive an encoding for Binary Decision Diagrams with the unique property that its boolean evaluation faithfully mimics its structural conversion to a a natural number through recursive application of a matching pairing function. We then use this result to derive {\\em ranking} and {\\em unranking} functions for BDDs and reduced BDDs. The paper is organized as a self-contained literate Prolog program, available at \\url{http://logic.csci.unt.edu/tarau/research/2008/pBDD.zip}. {\\em Keywords:} logic programming and computational mathematics, pairing/unpairing functions, encodings of boolean functions, binary decision diagrams, natural number representations of truth tables

Tarau, Paul

2008-01-01T23:59:59.000Z

382

The QCD phase diagram from Schwinger-Dyson Equations  

E-Print Network (OSTI)

We study the phase diagram of quantum chromodynamics (QCD). For this purpose we employ the Schwinger-Dyson equations (SDEs) technique and construct a truncation of the infinite tower of equations by demanding a matching with the lattice results for the quark-anti-quark condensate at finite temperature (T), for zero quark chemical potential (mu), that is, the region where lattice calculations are expected to provide reliable results. We compute the evolution of the phase diagram away from T=0 for increasing values of the chemical potential by following the evolution of the heat capacity as a function of T and mu. The behavior of this thermodynamic variable clearly demonstrates the existence of a cross-over for mu less than a critical value. However, the heat capacity develops a singularity near mu approx 0.22 GeV marking the onslaught of a first order phase transition characterized by the existence of a critical point. The critical line continues until mu approx 0.53 GeV where Tc=0 and thus chiral symmetry is finally restored.

Enif Gutierrez; Aftab Ahmad; Alejandro Ayala; Adnan Bashir; Alfredo Raya

2013-04-30T23:59:59.000Z

383

Novel selective surface flow (SSF{trademark}) membranes for the recovery of hydrogen from waste gas streams. Phase 2: Technology development, final report  

SciTech Connect

The objective of Phase II of the Selective Surface Flow Membrane program was Technology Development. Issues addressed were: (i) to develop detailed performance characteristics on a 1 ft{sup 2} multi- tube module and develop design data, (ii) to build a field test rig and complete field evaluation with the 1 ft{sup 2} area membrane system, (iii) to implement membrane preparation technology and demonstrate membrane performance in 3.5 ft long tube, (iv) to complete detailed process design and economic analysis.

Anand, M.; Ludwig, K.A.

1996-04-01T23:59:59.000Z

384

Development of a fuel-rod simulator and small-diameter thermocouples for high-temperature, high-heat-flux tests in the Gas-Cooled Fast Reactor Core Flow Test Loop  

SciTech Connect

The Core Flow Test Loop was constructed to perform many of the safety, core design, and mechanical interaction tests in support of the Gas-Cooled Fast Reactor (GCFR) using electrically heated fuel rod simulators (FRSs). Operation includes many off-normal or postulated accident sequences including transient, high-power, and high-temperature operation. The FRS was developed to survive: (1) hundreds of hours of operation at 200 W/cm/sup 2/, 1000/sup 0/C cladding temperature, and (2) 40 h at 40 W/cm/sup 2/, 1200/sup 0/C cladding temperature. Six 0.5-mm type K sheathed thermocouples were placed inside the FRS cladding to measure steady-state and transient temperatures through clad melting at 1370/sup 0/C.

McCulloch, R.W.; MacPherson, R.E.

1983-03-01T23:59:59.000Z

385

Innovative coke oven gas cleaning system for retrofit applications. Volume 1, Public design report  

SciTech Connect

This Public Design Report provides, in a single document, available nonproprietary design -information for the ``Innovative Coke Oven Gas Cleaning System for Retrofit Applications`` Demonstration Project at Bethlehem Steel Corporation`s Sparrows Point, Maryland coke oven by-product facilities. This project demonstrates, for the first time in the United States, the feasibility of integrating four commercially available technologies (processes) for cleaning coke oven gas. The four technologies are: Secondary Gas Cooling, Hydrogen Sulfide and Ammonia Removal, Hydrogen Sulfide and Ammonia Recovery, and Ammonia Destruction and Sulfur Recovery. In addition to the design aspects, the history of the project and the role of the US Department of,Energy are briefly discussed. Actual plant capital and projected operating costs are also presented. An overview of the integration (retrofit) of the processes into the existing plant is presented and is followed by detailed non-proprietary descriptions of the four technologies and their overall effect on reducing the emissions of ammonia, sulfur, and other pollutants from coke oven gas. Narrative process descriptions, simplified process flow diagrams, input/output stream data, operating conditions, catalyst and chemical requirements, and utility requirements are given for each unit. Plant startup provisions, environmental considerations and control monitoring, and safety considerations are also addressed for each process.

Not Available

1994-05-24T23:59:59.000Z

386

Shroud leakage flow discouragers  

SciTech Connect

A turbine assembly includes a plurality of rotor blades comprising a root portion, an airfoil having a pressure sidewall and a suction sidewall, and a top portion having a cap. An outer shroud is concentrically disposed about said rotor blades, said shroud in combination with said tip portions defining a clearance gap. At least one circumferential shroud leakage discourager is disposed within the shroud. The leakage discourager(s) increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the clearance gap to improve overall turbine efficiency.

Bailey, Jeremy Clyde (Middle Grove, NY); Bunker, Ronald Scott (Niskayuna, NY)

2002-01-01T23:59:59.000Z

387

Gas Sampling | Open Energy Information  

Open Energy Info (EERE)

Gas Sampling Gas Sampling Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Gas Sampling Details Activities (7) Areas (7) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Field Techniques Exploration Sub Group: Field Sampling Parent Exploration Technique: Field Sampling Information Provided by Technique Lithology: Stratigraphic/Structural: High flux can be indicative of conduits for fluid flow. Hydrological: Gas composition and source of fluids. Thermal: Anomalous flux is associated with active hydrothermal activity. Distinguish magmatic/mantle heat inputs. Can be used to estimate reservoir fluid temperatures. Dictionary.png Gas Sampling: Gas sampling is done to characterize the chemical, thermal, and hydrological properties of a surface or subsurface hydrothermal system.

388

GAS METERING PUMP  

DOE Patents (OSTI)

A liquid piston gas pump is described, capable of pumping minute amounts of gas in accurately measurable quantities. The pump consists of a flanged cylindrical regulating chamber and a mercury filled bellows. Sealed to the ABSTRACTS regulating chamber is a value and having a gas inlet and outlet, the inlet being connected by a helical channel to the bellows. A gravity check valve is in the gas outlet, so the gas passes through the inlet and the helical channel to the bellows where the pumping action as well as the metering is accomplished by the actuation of the mercury filled bellows. The gas then flows through the check valve and outlet to any associated apparatus.

George, C.M.

1957-12-31T23:59:59.000Z

389

Apples with apples: accounting for fuel price risk in comparisons of gas-fired and renewable generation  

E-Print Network (OSTI)

in the market, allowing natural gas price volatility to flowClearly, the variability of gas prices poses a major risk toincreasingly volatile natural gas prices, renewable energy

Bolinger, Mark; Wiser, Ryan

2003-01-01T23:59:59.000Z

390

Y-12 Plant decontamination and decommissioning technology logic diagram for Building 9201-4. Volume 2: Technology logic diagram  

Science Conference Proceedings (OSTI)

The Y-12 Plant Decontamination and Decommissioning Technology Logic Diagram for Building 9201-4 (TLD) was developed to provide a decision-support tool that relates decontamination and decommissioning (D and D) problems at Bldg. 9201-4 to potential technologies that can remediate these problems. This TLD identifies the research, development, demonstration, testing, and evaluation needed for sufficient development of these technologies to allow for technology transfer and application to D and D and waste management (WM) activities. It is essential that follow-on engineering studies be conducted to build on the output of this project. These studies will begin by selecting the most promising technologies identified in the TLD and by finding an optimum mix of technologies that will provide a socially acceptable balance between cost and risk. The TLD consists of three fundamentally separate volumes: Vol. 1 (Technology Evaluation), Vol. 2 (Technology Logic Diagram), and Vol. 3 (Technology Evaluation Data Sheets). Volume 2 contains the logic linkages among environmental management goals, environmental problems, and the various technologies that have the potential to solve these problems. Volume 2 has been divided into five sections: Characterization, Decontamination, Dismantlement, Robotics/Automation, and Waste Management. Each section contains logical breakdowns of the Y-12 D and D problems by subject area and identifies technologies that can be reasonably applied to each D and D challenge.

NONE

1994-09-01T23:59:59.000Z

391

2007 FINAL NATURAL GAS MARKET ASSESSMENT  

E-Print Network (OSTI)

.............................................................. 66 Figure 49: LNG Flows from Terminal the flow of regasified LNG from the Costa Azul LNG terminal in Baja California. The intrastate pipeline natural gas (LNG) terminal in Southern California, and one assuming dry hydro conditions. This final

392

US energy flow, 1991  

SciTech Connect

Trends in energy consumption and assessment of energy sources are discussed. Specific topics discussed include: energy flow charts; comparison of energy use with 1990 and earlier years; supply and demand of fossil fuels (oils, natural gas, coal); electrical supply and demand; and nuclear power.

Borg, I.Y.; Briggs, C.K.

1992-06-01T23:59:59.000Z

393

Single chamber fuel cells: Flow geometry, rate and composition considerations  

DOE Green Energy (OSTI)

Four different single chamber fuel cell designs were compared using propane-air gas mixtures. Gas flow around the electrodes has a significant influence on the open circuit voltage and the power density of the cell. The strong influence of flow geometry is likely due to its effect on gas composition, particularly on the oxygen chemical potential at the two electrodes as a result of gas mixing. The chamber design which exposes the cathode first to the inlet gas was found to yield the best performance at lower flow rates, while the open tube design with the electrodes equally exposed to the inlet gas worked best at higher flow rates.

Stefan, Ionel C.; Jacobson, Craig P.; Visco, Steven J.; De Jonghe, Lutgard C.

2003-11-17T23:59:59.000Z

394

QCD Phase Diagram According to the Center Group  

SciTech Connect

We study an effective theory for QCD at finite temperature and density which contains the leading center symmetric and center symmetry breaking terms. The effective theory is studied in a flux representation where the complex phase problem is absent and the model becomes accessible to Monte Carlo techniques also at finite chemical potential. We simulate the system by using a generalized Prokof'ev-Svistunov worm algorithm and compare the results to a low temperature expansion. The phase diagram is determined as a function of temperature, chemical potential, and quark mass. The shape and quark mass dependence of the phase boundaries are as expected for QCD. The transition into the deconfined phase is smooth throughout, without any discontinuities or critical points.

Delgado Mercado, Ydalia; Gattringer, Christof [Institut fuer Physik, Karl-Franzens Universitaet, Graz (Austria); Evertz, Hans Gerd [Institute for Theoretical and Computational Physics, Technische Universitaet Graz (Austria)

2011-06-03T23:59:59.000Z

395

Third moments of conserved charges in QCD phase diagram  

E-Print Network (OSTI)

We point out that the third moments of conserved charges, the baryon and electric charge numbers, and energy, as well as their mixed moments, change their signs around the QCD phase boundary in the temperature and baryon chemical potential plane. These signs can be measured in relativistic heavy ion collisions, and will give clear information on the phase structure of QCD and the state of the system in the early stage of relativistic heavy ion collisions. The behaviors of these moments on the temperature axis and at small quark chemical potential can be analyzed in lattice QCD simulations. We emphasize that the third moments obtained on the lattice, together with the experimental results, will provide a deep understanding about the QCD phase diagram and the location of the state created in heavy ion collisions.

Kitazawa, Masakiyo; Ejiri, Shinji

2009-01-01T23:59:59.000Z

396

The phase diagram of hydrogen in ultra thin films  

DOE Green Energy (OSTI)

This paper, we discuss changes in the phase diagram of hydrogen in both bilayer (i.e. 200-2000 {Angstrom} Nb/100 {Angstrom} Pd on glass) and multilayer configurations. Comparison of x-ray diffraction, electrical resistivity and volumetric measurements of the films before and after hydrogen charging indicate that the phase equilibria between a correlated (high concentration) and a dilute phase of hydrogen in Nb is not sensitive to the number of layers in the films. On the other hand, the experimental methods show different behavior for 200 {Angstrom} thick Nb films and thicker (>400 {Angstrom}) Nb layers. The diffraction results also show that, while charging with hydrogen, the Nb layers mainly expand along the surface normal of the films, while the Pd layers expand in all directions equally, and transform to the bulk {alpha} phase.

Jisrawi, N.M.; Ruckman, M.W.; Reisfeld, G.; Wiesmann, H.; Loeb, F; Gallego, E.; Gorelik, Y.; Thurston, T.R.; Strongin, M.

1995-12-31T23:59:59.000Z

397

Ternary Phase Diagram of the Zn-Sn-P System for Fabrication of ...  

Science Conference Proceedings (OSTI)

First, we establish the phase diagram by equilibrium experiments using zinc, tin and their phosphides. At 700 C, ZnSnP2 is almost stoichiometry,...

398

Iron-Carbon Phase Diagram: A Century at Variance with Chemical ...  

Science Conference Proceedings (OSTI)

Abstract Scope, For about a century thermodynamically absurd facts have been propagated in conjunction with the iron-carbon phase diagram. These facts...

399

High-temperature Soft Solders: The Ni-Sn-Zn Phase Diagram  

Science Conference Proceedings (OSTI)

In this contribution, the phase diagram information from a large amount of own experimental data and various available literature reports were merged into a...

400

Minimal free resolutions and Betti diagrams of the algebras of $SL_2$-invariants  

E-Print Network (OSTI)

For the algebras of $SL_2$-invariants of small homological dimension theirs minimal free graded resolutions and graded Betti diagrams calculated.

Bedratyuk, Leonid

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Canadian natural gas: Review of 1996 and outlook to 2002  

Science Conference Proceedings (OSTI)

This review provides summaries of North American gas industry trends, including supply, demand, storage, gas flows, prices, transportation capacities, and Canadian gas export volumes, export prices, and revenues. Forecasts of North American demand, supply, gas flows, pipeline capacity, prices, and sales are provided to 2002. The appendix reviews regional natural gas markets, with detail on the drivers of gas consumption by sector for each region in Canada and the United States.

Not Available

1997-01-01T23:59:59.000Z

402

Natural Gas | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

in the North Slope of Alaska that was able to safely extract a steady flow of natural gas from methane hydrates - a vast, entirely untapped resource that holds enormous...

403

Historical Natural Gas Annual  

Gasoline and Diesel Fuel Update (EIA)

8 8 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at selected points in the flow of gas from the wellhead to the burner-tip. Data include production, transmission within the United States, imports and exports of natural gas, underground storage activities, and deliveries to consumers. The publication presents historical data at the national level for 1930-1998 and detailed annual historical information by State for 1967-1998. The Historical Natural Gas Annual tables are available as self-extracting executable files in ASCII TXT or CDF file formats. Tables 1-3 present annual historical data at the national level for 1930-1998. The remaining tables contain detailed annual historical information, by State, for 1967-1998. Please read the file entitled READMEV2 for a description and documentation of information included in this file.

404

Historical Natural Gas Annual  

Gasoline and Diesel Fuel Update (EIA)

6 6 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at selected points in the flow of gas from the wellhead to the burner-tip. Data include production, transmission within the United States, imports and exports of natural gas, underground storage activities, and deliveries to consumers. The publication presents historical data at the national level for 1930-1996 and detailed annual historical information by State for 1967-1996. The Historical Natural Gas Annual tables are available as self-extracting executable files in ASCII TXT or CDF file formats. Tables 1-3 present annual historical data at the national level for 1930-1996. The remaining tables contain detailed annual historical information, by State, for 1967-1996. Please read the file entitled READMEV2 for a description and documentation of information included in this file.

405

Historical Natural Gas Annual  

Gasoline and Diesel Fuel Update (EIA)

7 7 The Historical Natural Gas Annual contains historical information on supply and disposition of natural gas at the national, regional, and State level as well as prices at selected points in the flow of gas from the wellhead to the burner-tip. Data include production, transmission within the United States, imports and exports of natural gas, underground storage activities, and deliveries to consumers. The publication presents historical data at the national level for 1930-1997 and detailed annual historical information by State for 1967-1997. The Historical Natural Gas Annual tables are available as self-extracting executable files in ASCII TXT or CDF file formats. Tables 1-3 present annual historical data at the national level for 1930-1997. The remaining tables contain detailed annual historical information, by State, for 1967-1997. Please read the file entitled READMEV2 for a description and documentation of information included in this file.

406

Modelling and model checking suspendible business processes via statechart diagrams and CSP  

Science Conference Proceedings (OSTI)

When modelling object behaviour with UML statechart diagrams, the history mechanism can be useful for modelling the suspension of a ''normal'' business process upon certain ''abnormal'' events together with the subsequent resumption, as illustrated by ... Keywords: History mechanism, Model checking, Object behaviour, Process modelling, Statechart diagrams

W. L. Yeung; K. R. P. H. Leung; Ji Wang; Wei Dong

2007-03-01T23:59:59.000Z

407

Quadratic and cubic b-splines by generalizing higher-order voronoi diagrams  

Science Conference Proceedings (OSTI)

A long-standing problem in spline theory has been to generalize classic B-splines to the multivariate setting, and its full solution will have broad impact. We initiate a study of triangulations that generalize the duals of higher order Voronoi diagrams, ... Keywords: centroid triangulation, higher order Voronoi diagrams, multivariate splines

Yuanxin Liu; Jack Snoeyink

2007-06-01T23:59:59.000Z

408

Experimental and Numerical Investigation of Forming Limit Diagram for AA3105  

SciTech Connect

In this work, forming limit diagram for aluminum alloy 3105 is performed experimentally using out of plane test. In addition, using ductile fracture criteria and finite element simulation, forming limit diagram of aluminum alloy 3105 is performed numerically. Finally, it is shown that the results obtained from numerical prediction are in good agreement with experimental results.

Safari, Mehdi; Yousefzadeh, Sh. [Islamic Azad University, Aligoodarz Branch, Department of Mechanical Engineering P. O. Box 159, Aligoodarz (Iran, Islamic Republic of); Hoseinipour, S. J. [Babol University of Technology, Department of Mechanical Engineering, Babol (Iran, Islamic Republic of); Azodi, H. D. [Iran University of Science and Technology, Department of Mechanical Engineering, Tehran (Iran, Islamic Republic of)

2011-01-17T23:59:59.000Z

409

Smartvolumes - adaptive Voronoi power diagramming for real-time volumetric design exploration  

Science Conference Proceedings (OSTI)

Voronoi Diagrams and Delaunay Triangulations are two concepts fundamental to computational geometry, which have been applied in the most varied disciplines. In recent years, they are increasingly used in architectural design. In this paper, a novel method ... Keywords: computational design, delaunay triangulation, design environments, design exploration, interactive architecture, voronoi diagram

Christian Friedrich

2007-09-01T23:59:59.000Z

410

MARD-A moving average rose diagram application for the geosciences  

Science Conference Proceedings (OSTI)

MARD 1.0 is a computer program for generating smoothed rose diagrams by using a moving average, which is designed for use across the wide range of disciplines encompassed within the Earth Sciences. Available in MATLAB^(R), Microsoft^(R) Excel and GNU ... Keywords: Circular statistics, MATLAB, Microsoft Excel, Moving average, Rose diagram, Vector mean

Mark A. Munro; Thomas G. Blenkinsop

2012-12-01T23:59:59.000Z

411

Employment Of Fuzzy Logic In Feature Diagrams To Model Variability In Software Families  

Science Conference Proceedings (OSTI)

The features of software family members may vary according to the needs of particular market segments or purposes. The assessment of what will be common and what will be variable feature may result from particular needs and market strategies. Further, ... Keywords: FODA feature diagrams, feature diagram tree, fuzzy representation, knowledge base, power plant description

Silva Robak; Andrzej Pieczy?ski

2003-08-01T23:59:59.000Z

412

On application of multi-rooted binary decision diagrams to probabilistic model checking  

Science Conference Proceedings (OSTI)

In this paper we consider the applicability of multi-rooted binary decision diagrams for the probabilistic model checking. The symbolic probabilistic model checking involves manipulation of functions and matrices with the values in [0,1], and multi-terminal ... Keywords: binary decision diagrams, probabilistic model checking

Dmitry Bugaychenko

2012-01-01T23:59:59.000Z

413

Non-Abelian Groups in Optimization of Decision Diagrams Representations of Discrete Functions  

Science Conference Proceedings (OSTI)

This paper is devoted to the reduction of decision diagram (DD) representations of discrete functions by using the non-Abelian groups and Fourier DDs on these groups. The number of levels in a DD can be reduced through decomposition of the domain group ... Keywords: Fourier transform, decision diagrams, discrete functions, non-Abelian groups

Radomir S. Stankovi?

2001-05-01T23:59:59.000Z

414

Transformation of UML activity diagrams into analyzable systems and software blueprints construction  

Science Conference Proceedings (OSTI)

Unified Modeling Language (UML) is a standard language for software blueprints, UML can be used to visualize, specify, construct and document software-intensive system of heritage. In the UML, the activity diagrams often are widely used to workflow and ... Keywords: activity diagram, system description, unified modeling language, visualize

Chien-Yuan Lai; Dong-Her Shih; Hsiu-Sen Chiang; Ching-Chiang Chen

2010-03-01T23:59:59.000Z

415

Experiences developing architectures for realizing thin-client diagram editing tools  

Science Conference Proceedings (OSTI)

Diagram-centric applications such as software design tools, project planning tools and business process modelling tools are usually thick-client applications running as stand-alone desktop applications. There are several advantages to providing ... Keywords: CASE tools, Web and mobile user interfaces, software architecture, thin-client diagramming

John Grundy; John Hosking; Shuping Cao; Denjin Zhao; Nianping Zhu; Ewan Tempero; Hermann Stoeckle

2007-10-01T23:59:59.000Z

416

Sensitivity of Fischer-Tropsch Synthesis and Water-Gas Shift Catalystes to Poisons form High-Temperature High-Pressure Entrained-Flow (EF) Oxygen-Blown Gasifier Gasification of Coal/Biomass Mixtures  

DOE Green Energy (OSTI)

There has been a recent shift in interest in converting not only natural gas and coal derived syngas to Fischer-Tropsch synthesis products, but also converting biomass-derived syngas, as well as syngas derived from coal and biomass mixtures. As such, conventional catalysts based on iron and cobalt may not be suitable without proper development. This is because, while ash, sulfur compounds, traces of metals, halide compounds, and nitrogen-containing chemicals will likely be lower in concentration in syngas derived from mixtures of coal and biomass (i.e., using entrained-flow oxygen-blown gasifier gasification gasification) than solely from coal, other compounds may actually be increased. Of particular concern are compounds containing alkali chemicals like the chlorides of sodium and potassium. In the first year, University of Kentucky Center for Applied Energy Research (UK-CAER) researchers completed a number of tasks aimed at evaluating the sensitivity of cobalt and iron-based Fischer-Tropsch synthesis (FT) catalysts and a commercial iron-chromia high temperature water-gas shift catalyst (WGS) to alkali halides. This included the preparation of large batches of 0.5%Pt-25%Co/Al{sub 2}O{sub 3} and 100Fe: 5.1Si: 3.0K: 2.0Cu (high alpha) catalysts that were split up among the four different entities participating in the overall project; the testing of the catalysts under clean FT and WGS conditions; the testing of the Fe-Cr WGS catalyst under conditions of co-feeding NaCl and KCl; and the construction and start-up of the continuously stirred tank reactors (CSTRs) for poisoning investigations.

Burton Davis; Gary Jacobs; Wenping Ma; Khalid Azzam; Janet ChakkamadathilMohandas; Wilson Shafer

2009-09-30T23:59:59.000Z

417

NATURAL GAS MARKET ASSESSMENT  

E-Print Network (OSTI)

............................................................. 36 Figure 28: LNG Flows from Terminal year. · Delivery of natural gas was expected from proposed LNG facilities on the east and west coasts.S. electricity demand. Future LNG supply could be affected by construction and expansion of LNG terminals

418

Scaling analysis and application: Phase diagram of magnetic nanorings and elliptical nanoparticles  

Science Conference Proceedings (OSTI)

The magnetic properties of single-domain nanoparticles with different geometric shapes, crystalline anisotropies, and lattice structures are investigated. A recently proposed scaling approach is shown to be universal and in agreement with dimensional analysis coupled with the assumption of incomplete self-similarity. It is used to obtain phase diagrams of magnetic nanoparticles featuring three competing configurations: in-plane ferromagnetism, out-of-plane ferromagnetism, and vortex formation. The influence of the vortex core on the scaling behavior and phase diagram is analyzed. Three-dimensional phase diagrams are obtained for cylindrical nanorings depending on their height and outer and inner radii. The triple points in these phase diagrams are shown to be in a linear relationship with the inner radius of the ring. Elliptically shaped magnetic nanoparticles are also studied. A new parametrization for double vortex configurations is proposed, and regions in the phase diagram where the double vortex is a stable ground state are identified.

Zhang Wen; Singh, Rohit; Bray-Ali, Noah; Haas, Stephan [Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089 (United States)

2008-04-01T23:59:59.000Z

419

Transport properties of a meson gas  

E-Print Network (OSTI)

We present recent results on a systematic method to calculate transport coefficients for a meson gas (in particular, we analyze a pion gas) at low temperatures in the context of Chiral Perturbation Theory. Our method is based on the study of Feynman diagrams with a power counting which takes into account collisions in the plasma by means of a non-zero particle width. In this way, we obtain results compatible with analysis of Kinetic Theory with just the leading order diagram. We show the behavior with temperature of electrical and thermal conductivities and shear and bulk viscosities, and we discuss the fundamental role played by unitarity. We obtain that bulk viscosity is negligible against shear viscosity near the chiral phase transition. Relations between the different transport coefficients and bounds on them based on different theoretical approximations are also discussed. We also comment on some applications to heavy-ion collisions.

D. Fernandez-Fraile; A. Gomez Nicola

2007-06-25T23:59:59.000Z

420

Global phase diagram of a doped Kitaev-Heisenberg model  

SciTech Connect

The global phase diagram of a doped Kitaev-Heisenberg model is studied using an $SU(2)$ slave-boson mean-field method. Near the Kitaev limit, $p$-wave superconducting states which break the time-reversal symmetry are stabilized as reported by You {\\it et al.} [Phys. Rev. B {\\bf 86}, 085145 (2012)] irrespective of the sign of the Kitaev interaction. By further doping, a $d$-wave superconducting state appears when the Kitaev interaction is antiferromagnetic, while another $p$-wave superconducting state appears when the Kitaev interaction is ferromagnetic. This $p$-wave superconducting state does not break the time-reversal symmetry as reported by Hyart {\\it et al.} [Phys. Rev. B {\\bf 85}, 140510 (2012)], and such a superconducting state also appears when the antiferromagnetic Kitaev interaction and the ferromagnetic Heisenberg interaction compete. This work, thus, demonstrates the clear difference between the antiferromagnetic Kitaev model and the ferromagnetic Kitaev model when carriers are doped while these models are equivalent in the undoped limit, and how novel superconducting states emerge when the Kitaev interaction and the Heisenberg interaction compete.

Okamoto, Satoshi [ORNL

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Equation of state and phase diagram of FeO  

Science Conference Proceedings (OSTI)

Wuestite, Fe{sub 1-x}O, is an important component in the mineralogy of Earth's lower mantle and may also be a component in the core. Therefore the high pressure, high temperature behavior of FeO, including its phase diagram and equation of state, is essential knowledge for understanding the properties and evolution of Earth's deep interior. We performed X-ray diffraction measurements using a laser-heated diamond anvil cell to achieve simultaneous high pressures and temperatures. Wuestite was mixed with iron metal, which served as our pressure standard, under the assumption that negligible oxygen dissolved into the iron. Our data show a positive slope for the subsolidus phase boundary between the B1 and B8 structures, indicating that the B1 phase is stable at the P-T conditions of the lower mantle and core. We have determined the thermal equation of state of B1 FeO to 156 GPa and 3100 K, finding an isothermal bulk modulus K{sub 0} = 149.4 {+-} 1.0 GPa and its pressure derivative K'{sub 0} = 3.60 {+-} 0.4. This implies that 7.7 {+-} 1.1 wt.% oxygen is required in the outer core to match the seismologically-determined density, under the simplifying assumption of a purely Fe-O outer core.

Fischer, Rebecca A.; Campbell, Andrew J.; Shofner, Gregory A.; Lord, Oliver T.; Dera, Przemyslaw; Prakapenka, Vitali B. (Bristol); (Maryland); (UC)

2012-04-11T23:59:59.000Z

422

Butterfly Diagram and Activity Cycles in HR 1099  

E-Print Network (OSTI)

We analyze photometric data of the active RS CVn--type star HR 1099 for the years 1975--2006 with an inversion technique and reveal the nature of two activity cycles of 15--16 yr and 5.3$\\pm$0.1 yr duration. The 16 yr cycle is related to variations of the total spot area and is coupled with the differential rotation, while the 5.3 yr cycle is caused by the symmetric redistribution of the spotted area between the opposite stellar hemispheres (flip-flop cycle). We recover long-lived active regions comprising two active longitudes that migrate in the orbital reference frame with a variable rate because of the differential rotation along with changes in the mean spot latitudes. The migration pattern is periodic with the 16 yr cycle. Combining the longitudinal migration of the active regions with a previously measured differential rotation law, we recover the first stellar butterfly diagram without an assumption about spot shapes. We find that mean latitudes of active regions at opposite longitudes change antisymmetrically in the course of the 16 yr cycle: while one active region migrates to the pole, the other approaches the equator. This suggests a precession of the global magnetic field with respect to the stellar rotational axis.

S. V. Berdyugina; G. W. Henry

2007-03-20T23:59:59.000Z

423

Sensitivity of Fischer-Tropsch Synthesis and Water-Gas Shift Catalysts to Poisons from High-Temperature High-Pressure Entrained-Flow (EF) Oxygen-Blown Gasifier Gasification of Coal/Biomass Mixtures  

Science Conference Proceedings (OSTI)

There has been a recent shift in interest in converting not only natural gas and coal derived syngas to Fischer-Tropsch synthesis products, but also converting biomass-derived syngas, as well as syngas derived from coal and biomass mixtures. As such, conventional catalysts based on iron and cobalt may not be suitable without proper development. This is because, while ash, sulfur compounds, traces of metals, halide compounds, and nitrogen-containing chemicals will likely be lower in concentration in syngas derived from mixtures of coal and biomass (i.e., using entrained-flow oxygen-blown gasifier gasification gasification) than solely from coal, other compounds may actually be increased. Of particular concern are compounds containing alkali chemicals like the chlorides of sodium and potassium. In the first year, University of Kentucky Center for Applied Energy Research (UK-CAER) researchers completed a number of tasks aimed at evaluating the sensitivity of cobalt and iron-based Fischer-Tropsch synthesis (FT) catalysts and a commercial iron-chromia high temperature water-gas shift catalyst (WGS) to alkali halides. This included the preparation of large batches of 0.5%Pt-25%Co/Al{sub 2}O{sub 3} and 100Fe: 5.1Si: 3.0K: 2.0Cu (high alpha) catalysts that were split up among the four different entities participating in the overall project; the testing of the catalysts under clean FT and WGS conditions; the testing of the Fe-Cr WGS catalyst under conditions of co-feeding NaCl and KCl; and the construction and start-up of the continuously stirred tank reactors (CSTRs) for poisoning investigations. In the second and third years, researchers from the University of Kentucky Center for Applied Energy Research (UK-CAER) continued the project by evaluating the sensitivity of a commercial iron-chromia high temperature water-gas shift catalyst (WGS) to a number of different compounds, including KHCO{sub 3}, NaHCO{sub 3}, HCl, HBr, HF, H{sub 2}S, NH{sub 3}, and a combination of H{sub 2}S and NH{sub 3}. Cobalt and iron-based Fischer-Tropsch synthesis (FT) catalysts were also subjected to a number of the same compounds in order to evaluate their sensitivities at different concentration levels of added contaminant.

Burton Davis; Gary Jacobs; Wenping Ma; Dennis Sparks; Khalid Azzam; Janet Chakkamadathil Mohandas; Wilson Shafer; Venkat Ramana Rao Pendyala

2011-09-30T23:59:59.000Z

424

Impact of Natural Gas Infrastructure on Electric Power Systems  

E-Print Network (OSTI)

--Combined-cycle unit, electricity market, natural gas infrastructure, pipeline contingency, pumped-storage hydro, renew gas utilities typically rely on the natural gas storage to augment supplies flowing through) in the natural gas system, deliver natural gas from city gate stations, underground storage facilities, and other

Fu, Yong

425

Research and Application of the Natural Gas Heater  

Science Conference Proceedings (OSTI)

The natural gas heater is an indispensable piece of equipment in natural gas production, transmission, and application systems and is widely used in gas wellhead, metering station, transfer station and gas power plant etc. As a special type of furnace, ... Keywords: energy science and technology, natural gas heater, flow field organization, large cylinder, heat-transfer medium

Guo Yun; Cao Wei-wu

2009-10-01T23:59:59.000Z

426

Date","Time if available","Events -- Flow Conditions","Collection  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

-- Flow Conditions","Collection" "applicationvnd.ms-excel",,"Explosion and fire; oil and gas flow up riser to ocean surface","None" "applicationvnd.ms-excel",,"Rig sinks;...

427

Ruslands Gas.  

E-Print Network (OSTI)

??This paper is about Russian natural gas and the possibility for Russia to use its reserves of natural gas politically towards the European Union to (more)

Elkjr, Jonas Bondegaard

2009-01-01T23:59:59.000Z

428

Gas only nozzle fuel tip  

DOE Patents (OSTI)

A diffusion flame nozzle gas tip is provided to convert a dual fuel nozzle to a gas only nozzle. The nozzle tip diverts compressor discharge air from the passage feeding the diffusion nozzle air swirl vanes to a region vacated by removal of the dual fuel components, so that the diverted compressor discharge air can flow to and through effusion holes in the end cap plate of the nozzle tip. In a preferred embodiment, the nozzle gas tip defines a cavity for receiving the compressor discharge air from a peripheral passage of the nozzle for flow through the effusion openings defined in the end cap plate.

Bechtel, William Theodore (Scotia, NY); Fitts, David Orus (Ballston Spa, NY); DeLeonardo, Guy Wayne (Glenville, NY)

2002-01-01T23:59:59.000Z

429

Solar cycle variations of large scale flows in the Sun  

E-Print Network (OSTI)

Using data from the Michelson Doppler Imager (MDI) instrument on board the Solar and Heliospheric Observatory (SOHO), we study the large-scale velocity fields in the outer part of the solar convection zone using the ring diagram technique. We use observations from four different times to study possible temporal variations in flow velocity. We find definite changes in both the zonal and meridional components of the flows. The amplitude of the zonal flow appears to increase with solar activity and the flow pattern also shifts towards lower latitude with time.

Sarbani Basu; H. M. Antia

2000-01-17T23:59:59.000Z

430

Virtual Measurement in Pipes, Part 1: Flowing Bottom Hole Pressure Under Multi-Phase Flow and Inclined Wellbore Conditions  

E-Print Network (OSTI)

the utmost importance in maximizing the reservoir energy in naturally flowing and artificial lift wells as the number of variables increases. Many parameters could be involved in these types of problems, such as gas information such as oil, gas and water flow rates, temperature, oil and gas gravity, pipe length, surface

Mohaghegh, Shahab

431

Core collapse supernovae in the QCD phase diagram  

SciTech Connect

We compare two classes of hybrid equations of state with a hadron-to-quark matter phase transition in their application to core collapse supernova simulations. The first one uses the quark bag model and describes the transition to three-flavor quark matter at low critical densities. The second one employs a Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model with parameters describing a phase transition to two-flavor quark matter at higher critical densities. These models possess a distinctly different temperature dependence of their transition densities which turns out to be crucial for the possible appearance of quark matter in supernova cores. During the early post-bounce accretion phase quark matter is found only if the phase transition takes place at sufficiently low densities as in the study based on the bag model. The increase critical density with increasing temperature, as obtained for our PNJL parametrization, prevents the formation of quark matter. The further evolution of the core collapse supernova as obtained applying the quark bag model leads to a structural reconfiguration of the central protoneutron star where, in addition to a massive pure quark matter core, a strong hydrodynamic shock wave forms and a second neutrino burst is released during the shock propagation across the neutrinospheres. We discuss the severe constraints in the freedom of choice of quark matter models and their parametrization due to the recently observed 2M{sub Circled-Dot-Operator} pulsar and their implications for further studies of core collapse supernovae in the QCD phase diagram.

Fischer, T., E-mail: t.fischer@gsi.de [Helmholtzzentrum fuer Schwerionenforschung GmbH, GSI (Germany); Blaschke, D. [University of Wroclaw, Institute for Theoretical Physics (Poland); Hempel, M. [University of Basel, Department of Physics (Switzerland); Klaehn, T.; Lastowiecki, R. [University of Wroclaw, Institute for Theoretical Physics (Poland); Liebendoerfer, M. [University of Basel, Department of Physics (Switzerland); Martinez-Pinedo, G. [Helmholtzzentrum fuer Schwerionenforschung GmbH, GSI (Germany); Pagliara, G.; Sagert, I. [Ruprecht-Karls-Universitaet, Institut fuer Theoretische Physik (Germany); Sandin, F. [Lulea Tekniska Universitet, Department of Computer Science and Electrical Engineering, EISLAB (Sweden); Schaffner-Bielich, J. [Ruprecht-Karls-Universitaet, Institut fuer Theoretische Physik (Germany); Typel, S. [Helmholtzzentrum fuer Schwerionenforschung GmbH, GSI (Germany)

2012-05-15T23:59:59.000Z

432

System for measuring multiphase flow using multiple pressure differentials  

DOE Patents (OSTI)

An improved method and system for measuring a multi-phase flow in a pressure flow meter. An extended throat venturi is used and pressure of the multi-phase flow is measured at three or more positions in the venturi, which define two or more pressure differentials in the flow conduit. The differential pressures are then used to calculate the mass flow of the gas phase, the total mass flow, and the liquid phase. The system for determining the mass flow of the high void fraction fluid flow and the gas flow includes taking into account a pressure drop experienced by the gas phase due to work performed by the gas phase in accelerating the liquid phase.

Fincke, James R. (Idaho Falls, ID)

2003-01-01T23:59:59.000Z

433

Canadian natural gas: Review of 1997 and outlook to 2005  

Science Conference Proceedings (OSTI)

This review provides summaries of North American gas industry trends, including supply, demand, storage, gas flows, prices, transportation capacities, and Canadian gas export volumes, export prices, and revenues. Forecasts of North American demand, supply, gas flows, pipeline capacity, prices, and sales are provided to 2005. The focus of the review is on regional natural gas markets, with detail on the drivers of gas consumption by sector for each region in Canada and the United States. A regulatory analysis section updates developments in Canadian and US pipeline regulation, electric power deregulation and its effect on gas as a power source, and gas distribution.

Not Available

1998-01-01T23:59:59.000Z

434

Q, Break-even and the n{tau{sub E}} Diagram for Transient Fusion Plasmas  

SciTech Connect

Q, break-even and the Lawson diagram are well defined and understood for steady-state fusion plasma conditions. Since many fusion experiments are transient, it is necessary to clarify the definitions for instantaneous Q values and break-even so that the Lawson diagram can be interpreted for transient plasma conditions. This discussion shows that there are two mathematically correct methods to describe the Lawson diagram for a transient plasma: the Lawson/TFTR method and the JET/JT-60 method. These methods are discussed in detail in this paper.

Dale M. Meade

1998-04-01T23:59:59.000Z

435

Analyzing flow patterns in unsaturated fractured rock of Yucca Mountain using an integrated modeling approach  

E-Print Network (OSTI)

heat flow simulations use the 3-D thermal model grid (Figuremodel grid, which is used for gas flow and ambient heat flowgrid showing a smaller model domain, used for modeling gas and heat

Wu, Yu-Shu; Lu, Guoping; Zhang, Keni; Pan, Lehua; Bodvarsson, Gudmundur S.

2008-01-01T23:59:59.000Z

436

An Integrated Modeling Analysis of Unsaturated Flow Patterns in Fractured Rock  

E-Print Network (OSTI)

study, heat flow simulations use a 3-D thermal model grid (model grid, which is used for gas flow and ambient heat-flowgrid showing a smaller model domain, used for modeling gas and heat

Wu, Yu-Shu; Lu, Guoping; Zhang, Keni; Pan, Lehua; Bodvarsson, Gudmundur S.

2008-01-01T23:59:59.000Z

437

PC-based fluid and heat transfer analyzer for two-phase flow in pipes.  

E-Print Network (OSTI)

??Modeling the simultaneous flow of gas and liquid or two-phase gas-liquid flow in pipes is a key aspect in petroleum production. These models can enhance (more)

Afonja, Gbolahan.

2006-01-01T23:59:59.000Z

438

Travelling with/against the flow. Deterministic diffusive driven systems  

E-Print Network (OSTI)

We introduce and study a deterministic lattice model describing the motion of an infinite system of oppositely charged particles under the action of a constant electric field. As an application this model represents a traffic flow of cars moving in opposite directions along a narrow road. Our main results concern the Fundamental diagram of the system describing the dependence of average particle velocities on their densities and the Phase diagram describing the partition of the space of particle configurations into regions having different qualitative properties, which we identify with free, jammed and hysteresis phases.

Blank, Michael

2008-01-01T23:59:59.000Z

439

Travelling with/against the flow. Deterministic diffusive driven systems  

E-Print Network (OSTI)

We introduce and study a deterministic lattice model describing the motion of an infinite system of oppositely charged particles under the action of a constant electric field. As an application this model represents a traffic flow of cars moving in opposite directions along a narrow road. Our main results concern the Fundamental diagram of the system describing the dependence of average particle velocities on their densities and the Phase diagram describing the partition of the space of particle configurations into regions having different qualitative properties, which we identify with free, jammed and hysteresis phases.

Michael Blank

2008-10-13T23:59:59.000Z

440

Flow conditioner for fuel injector for combustor and method for low-NO.sub.x combustor  

Science Conference Proceedings (OSTI)

An injector for a gas turbine combustor including a catalyst coated surface forming a passage for feed gas flow and a channel for oxidant gas flow establishing an axial gas flow through a flow conditioner disposed at least partially within an inner wall of the injector. The flow conditioner includes a length with an interior passage opening into upstream and downstream ends for passage of the axial gas flow. An interior diameter of the interior passage smoothly reduces and then increases from upstream to downstream ends.

Dutta, Partha; Smith, Kenneth O.; Ritz, Frank J.

2013-09-10T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

EIA - Greenhouse Gas Emissions Overview  

Gasoline and Diesel Fuel Update (EIA)

Environment Environment Emissions of Greenhouse Gases in the U. S. Release Date: March 31, 2011 | Next Release Date: Report Discontinued | Report Number: DOE/EIA-0573(2009) Greenhouse Gas Emissions Overview Diagram Notes [a] CO2 emissions related to petroleum consumption (includes 64 MMTCO2 of non-fuel-related emissions). [b] CO2 emissions related to coal consumption (includes 0.3 MMTCO2 of non-fuel-related emissions). [c] CO2 emissions related to natural gas consumption (includes 13 MMTCO2 of non-fuel-related emissions). [d] Excludes carbon sequestered in nonfuel fossil products. [e] CO2 emissions from the plastics portion of municipal solid waste (11 MMTCO2) combusted for electricity generation and very small amounts (0.4 MMTCO2) of geothermal-related emissions.

442

Phase Transformation and Equilibrium Diagram of Ti-Al-Nb Ternary ...  

Science Conference Proceedings (OSTI)

The phase type and distribution range of Ti-Al-Nb ternary alloy, as well as calculated phase diagram, were directly obtained by TC calculation, as a instruction of...

443

A Current T-T-T Diagram for Wrought Alloy 718  

Science Conference Proceedings (OSTI)

A T-T-T study was carried out on the phase reactions in high quality wrought alloy ... The only phases found and plotted on the T-T-T diagram were f/. f. and delta.

444

An Odds Ratio Parameterization for ROC Diagram and Skill Score Indices  

Science Conference Proceedings (OSTI)

The relative operating characteristic (ROC) diagram is often used to assess the performance of a classification system, like the categorical forecast of an event occurrence. Categorical forecasting can be obtained by imposing a threshold on a ...

Agostino Manzato

2005-12-01T23:59:59.000Z

445

Unsteady Flow Model for Fractured Gas Reservoirs  

Science Conference Proceedings (OSTI)

Developing low permeability reservoirs is currently a big challenge to the industry. Because low permeability reservoirs are of low quality and are easily damaged, production from a single well is low, and there is unlikely to be any primary recovery. ... Keywords: Low permeability, Fractured well, Orthogonal transformation, Unsteady, Productivity

Li Yongming; Zhao Jinzhou; Gong Yang; Yao Fengsheng; Jiang Youshi

2010-12-01T23:59:59.000Z

446

Natural Gas Flow Calibration Service (NGFCS)  

Science Conference Proceedings (OSTI)

... procedures are included in the NIST NGFCS Quality Manual. ... specified where D is the pipe diameter ... inside diameter of the upstream piping is within ...

2012-05-21T23:59:59.000Z

447

Natural Gas Flow Calibration Service (NGFCS)  

Science Conference Proceedings (OSTI)

... Methane 94.8 to 96.2 Ethane 1.5 to 2.3 Propane 0.055 to 0.3 iButane 0.0008 to 0.03 nButane 0.0003 to 0.04 iPentane 0 to 0.01 nPentane 0 to ...

2013-01-22T23:59:59.000Z

448

Sensitivity of Fischer-Tropsch Synthesis and Water-Gas Shift Catalysts to Poisons from High-Temperature High-Pressure Entrained-Flow (EF) Oxygen-Blown Gasifier Gasification of Coal/Biomass Mixtures  

DOE Green Energy (OSTI)

The successful adaptation of conventional cobalt and iron-based Fischer-Tropsch synthesis catalysts for use in converting biomass-derived syngas hinges in part on understanding their susceptibility to byproducts produced during the biomass gasification process. With the possibility that oil production will peak in the near future, and due to concerns in maintaining energy security, the conversion of biomass-derived syngas and syngas derived from coal/biomass blends to Fischer-Tropsch synthesis products to liquid fuels may provide a sustainable path forward, especially considering if carbon sequestration can be successfully demonstrated. However, one current drawback is that it is unknown whether conventional catalysts based on iron and cobalt will be suitable without proper development because, while ash, sulfur compounds, traces of metals, halide compounds, and nitrogen-containing chemicals will likely be lower in concentration in syngas derived from mixtures of coal and biomass (i.e., using an entrained-flow oxygen-blown gasifier) than solely from coal, other byproducts may be present in higher concentrations. The current project examines the impact of a number of potential byproducts of concern from the gasification of biomass process, including compounds containing alkali chemicals like the chlorides of sodium and potassium. In the second year, researchers from the University of Kentucky Center for Applied Energy Research (UK-CAER) continued the project by evaluating the sensitivity of a commercial iron-chromia high temperature water-gas shift catalyst (WGS) to a number of different compounds, including KHCO{sub 3}, NaHCO{sub 3}, HCl, HBr, HF, H{sub 2}S, NH{sub 3}, and a combination of H{sub 2}S and NH{sub 3}. Cobalt and iron-based Fischer-Tropsch synthesis (FT) catalysts were also subjected to a number of the same compounds in order to evaluate their sensitivities.

Burtron Davis; Gary Jacobs; Wenping Ma; Khalid Azzam; Dennis Sparks; Wilson Shafer

2010-09-30T23:59:59.000Z

449

Gas turbine combustor transition  

DOE Patents (OSTI)

A method is described for converting a steam cooled transition to an air cooled transition in a gas turbine having a compressor in fluid communication with a combustor, a turbine section in fluid communication with the combustor, the transition disposed in a combustor shell and having a cooling circuit connecting a steam outlet and a steam inlet and wherein hot gas flows from the combustor through the transition and to the turbine section, includes forming an air outlet in the transition in fluid communication with the cooling circuit and providing for an air inlet in the transition in fluid communication with the cooling circuit. 7 figs.

Coslow, B.J.; Whidden, G.L.

1999-05-25T23:59:59.000Z

450

Gas turbine combustor transition  

DOE Patents (OSTI)

A method of converting a steam cooled transition to an air cooled transition in a gas turbine having a compressor in fluid communication with a combustor, a turbine section in fluid communication with the combustor, the transition disposed in a combustor shell and having a cooling circuit connecting a steam outlet and a steam inlet and wherein hot gas flows from the combustor through the transition and to the turbine section, includes forming an air outlet in the transition in fluid communication with the cooling circuit and providing for an air inlet in the transition in fluid communication with the cooling circuit.

Coslow, Billy Joe (Winter Park, FL); Whidden, Graydon Lane (Great Blue, CT)

1999-01-01T23:59:59.000Z

451

The QCD Phase Diagram: Large Nc, Quarkyonic Matter and the Triple Point  

SciTech Connect

I discuss the phase diagram of QCD in the large N_c limit. Quarkyonic Matter is described. The properties of QCD matter as measured in the abundance of produced particles are shown to be consistent with this phase diagram. A possible triple point of Hadronic Mater, Deconfined Matter and Quarkyonic matter is shown to explain various behaviors of ratios of particles abundances seen in CERN fixed target experiments.

McLerran L.

2010-01-31T23:59:59.000Z

452

The two-angle model and the phase diagram for Chromatin  

E-Print Network (OSTI)

We have studied the phase diagram for chromatin within the framework of the two-angle model. Rather than improving existing models with finer details our main focus of the work is getting mathematically rigorous results on the structure, especially on the excluded volume effects and the effects on the energy due to the long-range forces and their screening. Thus we present a phase diagram for the allowed conformations and the Coulomb energies.

Philipp M. Diesinger; Dieter W. Heermann

2005-05-02T23:59:59.000Z

453

Can We Accurately Model Fluid Flow in Shale?  

NLE Websites -- All DOE Office Websites (Extended Search)

2013 00:00 Over 20 trillion cubic meters of natural gas are trapped in shale, but many shale oil and gas producers still use models of underground fluid flow that date back to...

454

Spin-polarized 3He : liquid gas equilibrium S. Stringari (*), M. Barranco (+), A. Polls (+), P. J. Nacher (0394) and F. Lalo (0394)  

E-Print Network (OSTI)

1337 Spin-polarized 3He : liquid gas equilibrium S. Stringari (*), M. Barranco (+), A. Polls (+), P the effects of nuclear polarization M on the liquid-gas equilibrium phase diagram of 3He, in situations where article, we study another transition which takes place at lower pressures, the liquid-gas transition

Paris-Sud XI, Université de

455

Oxygen Absorption in Cooling Flows  

E-Print Network (OSTI)

The inhomogeneous cooling flow scenario predicts the existence of large quantities of gas in massive elliptical galaxies, groups, and clusters that have cooled and dropped out of the flow. Using spatially resolved, deprojected X-ray spectra from the ROSAT PSPC we have detected strong absorption over energies ~0.4-0.8 keV intrinsic to the central ~1 arcmin of the galaxy, NGC 1399, the group, NGC 5044, and the cluster, A1795. These systems have amongst the largest nearby cooling flows in their respective classes and low Galactic columns. Since no excess absorption is indicated for energies below ~0.4 keV the most reasonable model for the absorber is warm, collisionally ionized gas with T=10^{5-6} K where ionized states of oxygen provide most of the absorption. Attributing the absorption only to ionized gas reconciles the large columns of cold H and He inferred from Einstein and ASCA with the lack of such columns inferred from ROSAT, and also is consistent with the negligible atomic and molecular H inferred from HI, and CO observations of cooling flows. The prediction of warm ionized gas as the product of mass drop-out in these and other cooling flows can be verified by Chandra, XMM, and ASTRO-E.

David A. Buote

2000-01-19T23:59:59.000Z

456

Gas-cooled nuclear reactor  

DOE Patents (OSTI)

A gas-cooled nuclear reactor includes a central core located in the lower portion of a prestressed concrete reactor vessel. Primary coolant gas flows upward through the core and into four overlying heat-exchangers wherein stream is generated. During normal operation, the return flow of coolant is between the core and the vessel sidewall to a pair of motor-driven circulators located at about the bottom of the concrete pressure vessel. The circulators repressurize the gas coolant and return it back to the core through passageways in the underlying core structure. If during emergency conditions the primary circulators are no longer functioning, the decay heat is effectively removed from the core by means of natural convection circulation. The hot gas rising through the core exits the top of the shroud of the heat-exchangers and flows radially outward to the sidewall of the concrete pressure vessel. A metal liner covers the entire inside concrete surfaces of the concrete pressure vessel, and cooling tubes are welded to the exterior or concrete side of the metal liner. The gas coolant is in direct contact with the interior surface of the metal liner and transfers its heat through the metal liner to the liquid coolant flowing through the cooling tubes. The cooler gas is more dense and creates a downward convection flow in the region between the core and the sidewall until it reaches the bottom of the concrete pressure vessel when it flows radially inward and up into the core for another pass. Water is forced to flow through the cooling tubes to absorb heat from the core at a sufficient rate to remove enough of the decay heat created in the core to prevent overheating of the core or the vessel.

Peinado, Charles O. (La Jolla, CA); Koutz, Stanley L. (San Diego, CA)

1985-01-01T23:59:59.000Z

457

A flow cell for electron microscopy imaging of specimen in ...  

A flow cell for electron microscopy imaging of specimen in liquid or gas. Note: The technology described above is an early stage opportunity. ...

458

Automated gas chromatography  

DOE Patents (OSTI)

An apparatus and process for the continuous, near real-time monitoring of low-level concentrations of organic compounds in a liquid, and, more particularly, a water stream. A small liquid volume of flow from a liquid process stream containing organic compounds is diverted by an automated process to a heated vaporization capillary where the liquid volume is vaporized to a gas that flows to an automated gas chromatograph separation column to chromatographically separate the organic compounds. Organic compounds are detected and the information transmitted to a control system for use in process control. Concentrations of organic compounds less than one part per million are detected in less than one minute. 7 figs.

Mowry, C.D.; Blair, D.S.; Rodacy, P.J.; Reber, S.D.

1999-07-13T23:59:59.000Z

459

EIA - Natural Gas Pipeline Network - Major Natural Gas Transportation  

U.S. Energy Information Administration (EIA) Indexed Site

Natural Gas Transportation Corridors Natural Gas Transportation Corridors About U.S. Natural Gas Pipelines - Transporting Natural Gas based on data through 2007/2008 with selected updates Major Natural Gas Transportation Corridors Corridors from the Southwest | From Canada | From Rocky Mountain Area | Details about Transportation Corridors The national natural gas delivery network is intricate and expansive, but most of the major transportation routes can be broadly categorized into 11 distinct corridors or flow patterns. 5 major routes extend from the producing areas of the Southwest 4 routes enter the United States from Canada 2 originate in the Rocky Mountain area. A summary of the major corridors and links to details about each corridor are provided below. Corridors from the Southwest Region

460

Gas purification  

SciTech Connect

Natural gas having a high carbon dioxide content is contacted with sea water in an absorber at or near the bottom of the ocean to produce a purified natural gas.

Cook, C.F.; Hays, G.E.

1982-03-30T23:59:59.000Z

Note: This page contains sample records for the topic "gas flow diagram" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to