DENSE MULTIPHASE FLOW SIMULATION: CONTINUUM MODEL FOR POLYDISPERSED SYSTEMS USING KINETIC THEORY
Abstract
The overall objective of the project was to verify the applicability of the FCMOM approach to the kinetic equations describing the particle flow dynamics. For monodispersed systems the fundamental equation governing the particle flow dynamics is the Boltzmann equation. During the project, the FCMOM was successfully applied to several homogeneous and inhomogeneous problems in different flow regimes, demonstrating that the FCMOM has the potential to be used to solve efficiently the Boltzmann equation. However, some relevant issues still need to be resolved, i.e. the homogeneous cooling problem (inelastic particles cases) and the transition between different regimes. In this report, the results obtained in homogeneous conditions are discussed first. Then a discussion of the validation results for inhomogeneous conditions is provided. And finally, a discussion will be provided about the transition between different regimes. Alongside the work on development of FCMOM approach studies were undertaken in order to provide insights into anisotropy or particles kinetics in riser hydrodynamics. This report includes results of studies of multiphase flow with unequal granular temperatures and analysis of momentum redistribution in risers due to particleparticle and fluidparticle interactions. The study of multiphase flow with unequal granular temperatures entailed both simulation and experimental studies of twomore »
 Authors:
 Publication Date:
 Research Org.:
 Recinto Universitario Mayaguez
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1060497
 DOE Contract Number:
 NT0001740
 Resource Type:
 Technical Report
 Country of Publication:
 United States
 Language:
 English
 Subject:
 42 ENGINEERING
Citation Formats
Moses Bogere. DENSE MULTIPHASE FLOW SIMULATION: CONTINUUM MODEL FOR POLYDISPERSED SYSTEMS USING KINETIC THEORY. United States: N. p., 2011.
Web. doi:10.2172/1060497.
Moses Bogere. DENSE MULTIPHASE FLOW SIMULATION: CONTINUUM MODEL FOR POLYDISPERSED SYSTEMS USING KINETIC THEORY. United States. doi:10.2172/1060497.
Moses Bogere. 2011.
"DENSE MULTIPHASE FLOW SIMULATION: CONTINUUM MODEL FOR POLYDISPERSED SYSTEMS USING KINETIC THEORY". United States.
doi:10.2172/1060497. https://www.osti.gov/servlets/purl/1060497.
@article{osti_1060497,
title = {DENSE MULTIPHASE FLOW SIMULATION: CONTINUUM MODEL FOR POLYDISPERSED SYSTEMS USING KINETIC THEORY},
author = {Moses Bogere},
abstractNote = {The overall objective of the project was to verify the applicability of the FCMOM approach to the kinetic equations describing the particle flow dynamics. For monodispersed systems the fundamental equation governing the particle flow dynamics is the Boltzmann equation. During the project, the FCMOM was successfully applied to several homogeneous and inhomogeneous problems in different flow regimes, demonstrating that the FCMOM has the potential to be used to solve efficiently the Boltzmann equation. However, some relevant issues still need to be resolved, i.e. the homogeneous cooling problem (inelastic particles cases) and the transition between different regimes. In this report, the results obtained in homogeneous conditions are discussed first. Then a discussion of the validation results for inhomogeneous conditions is provided. And finally, a discussion will be provided about the transition between different regimes. Alongside the work on development of FCMOM approach studies were undertaken in order to provide insights into anisotropy or particles kinetics in riser hydrodynamics. This report includes results of studies of multiphase flow with unequal granular temperatures and analysis of momentum redistribution in risers due to particleparticle and fluidparticle interactions. The study of multiphase flow with unequal granular temperatures entailed both simulation and experimental studies of two particles sizes in a riser and, a brief discussion of what was accomplished will be provided. And finally, a discussion of the analysis done on momentum redistribution of gasparticles flow in risers will be provided. In particular a discussion of the remaining work needed in order to improve accuracy and predictability of riser hydrodynamics based on twofluid models and how they can be used to model segregation in risers.},
doi = {10.2172/1060497},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2011,
month = 8
}

The objective of this research is to combine recent advances in high performance computing (HPC), theoretical mechanics, and parallel nonlinear algorithms to make fundamental advances in the ability to predict transport phenomena in concentrated, multiphase, dispersed systems from first principles. The. ability to accurately model multiphase flow is central to the development of many energyrelated technologies such as transport of muds, cements, proppants, and produced solids in petroleum production; transport of coal slurry feedstocks and design of fluidized bed reactors in synfuel production; and the manufacture of semiconductors, turbine blades, and advanced composite materials for energy conservation.

Using a multiphase flow code to model the coupled effects of repository consolidation and multiphase brine and gas flow at the Waste Isolation Pilot Plant
Longterm repository assessment must consider the processes of (1) gas generation, (2) room closure and expansions due to salt creep, and (3) multiphase (brine and gas) fluid flow, as well as the complex coupling between these three processes. The mechanical creep closure code SANCHO was used to simulate the closure of a single, perfectly sealed disposal room filled with water and backfill. SANCHO uses constitutive models to describe salt creep, waste consolidation, and backfill consolidation, Five different gasgeneration rate histories were simulated, differentiated by a rate multiplier, f, which ranged from 0.0 (no gas generation) to 1.0 (expected gas generationmore » 
Numerical study of the flow of granular materials down an inclined plane using a model based on a kinetic theory approach. Quarterly report, July 1, 1993September 30, 1993
Kinetic theory approaches in the formulation of rapid flows of granular materials have attracted considerable attention in recent years. There are several models which have been suggested to describe the rapid flow of granular materials which are derived a using a statistical approach. Boyle and Massoudi (1989) have written comprehensive survey article of the constitutive equations and the laws governing the flow of granular materials. A major difference between the continuum theories discussed previously and the theories based on a statistical approach is the concept of {open_quotes}granular temperature{close_quotes} which is introduced in the latter approach. Granular temperature describes the fluctuating,more » 
Numerical study of the flow of granular materials down an inclined plane using a model based on a kinetic theory approach. Quarterly report, April 1June 30, 1993
In the previous report the linearized stability results for the flow of granular materials down an inclined plane, modeled by a constitutive theory based on the kinetic theory approach were presented. In this report, the authors derive the governing equations for the flow of granular materials down an inclined plane, modeled by the constitutive theory proposed by Boyle and Massoudi (1990). The governing equations obtained will be solved numerically to obtain the basic solutions. 
Comprehensive Benchmark Suite for Simulation of Particle Laden Flows Using the Discrete Element Method with Performance Profiles from the Multiphase Flow with Interface eXchanges (MFiX) Code
Five benchmark problems are developed and simulated with the computational fluid dynamics and discrete element model code MFiX. The benchmark problems span dilute and dense regimes, consider statistically homogeneous and inhomogeneous (both clusters and bubbles) particle concentrations and a range of particle and fluid dynamic computational loads. Several variations of the benchmark problems are also discussed to extend the computational phase space to cover granular (particles only), bidisperse and heat transfer cases. A weak scaling analysis is performed for each benchmark problem and, in most cases, the scalability of the code appears reasonable up to approx. 103 cores. Profiling ofmore »