skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Piecewise uniform conduction-like flow channels and method therefor

Abstract

A low-dispersion methodology for designing microfabricated conduction channels for on-chip electrokinetic-based systems is presented. The technique relies on trigonometric relations that apply for ideal electrokinetic flows, allowing faceted channels to be designed on chips using common drafting software and a hand calculator. Flows are rotated and stretched along the abrupt interface between adjacent regions with differing permeability. Regions bounded by interfaces form flow "prisms" that can be combined with other designed prisms to obtain a wide range of turning angles and expansion ratios while minimizing dispersion. Designs are demonstrated using two-dimensional numerical solutions of the Laplace equation.

Inventors:
 [1];  [1]
  1. Livermore, CA
Publication Date:
Research Org.:
Sandia National Laboratories (SNL-CA), Livermore, CA
Sponsoring Org.:
USDOE
OSTI Identifier:
908590
Patent Number(s):
7,005,301
Application Number:
10/456,772
Assignee:
Sandia National Laboratories (Livermore, CA) ALO
DOE Contract Number:
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Cummings, Eric B, and Fiechtner, Gregory J. Piecewise uniform conduction-like flow channels and method therefor. United States: N. p., 2006. Web.
Cummings, Eric B, & Fiechtner, Gregory J. Piecewise uniform conduction-like flow channels and method therefor. United States.
Cummings, Eric B, and Fiechtner, Gregory J. Tue . "Piecewise uniform conduction-like flow channels and method therefor". United States. doi:. https://www.osti.gov/servlets/purl/908590.
@article{osti_908590,
title = {Piecewise uniform conduction-like flow channels and method therefor},
author = {Cummings, Eric B and Fiechtner, Gregory J},
abstractNote = {A low-dispersion methodology for designing microfabricated conduction channels for on-chip electrokinetic-based systems is presented. The technique relies on trigonometric relations that apply for ideal electrokinetic flows, allowing faceted channels to be designed on chips using common drafting software and a hand calculator. Flows are rotated and stretched along the abrupt interface between adjacent regions with differing permeability. Regions bounded by interfaces form flow "prisms" that can be combined with other designed prisms to obtain a wide range of turning angles and expansion ratios while minimizing dispersion. Designs are demonstrated using two-dimensional numerical solutions of the Laplace equation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Feb 28 00:00:00 EST 2006},
month = {Tue Feb 28 00:00:00 EST 2006}
}

Patent:

Save / Share:
  • The invention relates to a unique battery having an active, porous membrane and method of making the same. More specifically the invention relates to a sealed battery system having a porous, metal oxide membrane with uniform, physicochemically functionalized ion channels capable of adjustable ionic interaction. The physicochemically-active porous membrane purports dual functions: an electronic insulator (separator) and a unidirectional ion-transporter (electrolyte). The electrochemical cell membrane is activated for the transport of ions by contiguous ion coordination sites on the interior two-dimensional surfaces of the trans-membrane unidirectional pores. The membrane material is designed to have physicochemical interaction with ions. Control ofmore » the extent of the interactions between the ions and the interior pore walls of the membrane and other materials, chemicals, or structures contained within the pores provides adjustability of the ionic conductivity of the membrane.« less
  • A borehole flow measurement system is described for determining the flow of fluids moving upwardly in a borehole from an underlying formation. The system consists of a line having a plurality of spaced markers located at predetermined distances (d) along the line, the line being oriented in the borehole so that the lower end is located below the underlying formation, means slidably engaging the line for selectively restricting the borehole, and means connected to the restricting means and slidable over the line for moving upwardly with the fluids along the line when the restricting means is open, the moving meansmore » not being capable of movement along the line when the restricting means is closed, the moving means being self-contained and impervious to the fluids and further comprising: (a) means in the moving means for selectively opening the restricting means after a predetermined time has elapsed, (b) means in the moving means for sensing each marker on the line as the opened restricting means carries the moving means upwardly along the line, and (c) means in the moving means and connected to the sensing means for determining the amount of elapsed time between each sensed marker, the determining means being further capable of storing the elapsed time between each successive marker, the stored elapsed time being proportional to the velocity of fluids between successive markers.« less
  • This patent describes a flow control device for a crankcase ventilating system of an internal combustion engine, the device comprising a valve housing means having an inlet and an outlet and an annular valve seat means therein intermediate the inlet and the outlet. A movable valve member is disposed in the housing means. A body portion is disposed in the inlet side of the valve seat means and there is a generally frusto-conical flow metering portion for cooperating with the valve seat means to control fluid flow therethrough. A spring means is disposed in the housing means and is operativelymore » associated with the housing means and the valve member to tend to urge the body portion of the valve member away from the valve seat means. The improvement described here is wherein the valve member has fin means adjacent the metering portion and on the outlet side of the valve seat means that cooperates with the housing means to tend to prevent vibration of the valve member during the fluid flow through the valve seat means. The fin means extends outwardly from the valve member, the fin means comprising spaced apart fins disposed in a circular array thereof and radiating outwardly from the valve member, the fin means comprising a separate part having an opening passing centrally therethrough. The valve member has a stem extending from the flow metering portion thereof and being disposed in the opening whereby the part is carried by the valve member.« less
  • An in situ oil shale retort containing a fragmented permeable mass of formation particles having a generally uniform permeability across horizontal cross-sections of the retort is provided. To form the retort, a void is excavated in a subterranean formation within the boundaries of the retort site, while at least one zone of unfragmented formation is left adjacent the void. A plurality of explosive charges are placed in the zone of unfragmented formation in a selected pattern; an array of central explosive charges and a plurality of perimeter charges arranged in rows surrounding the central charges. The spacing distance between eachmore » row of perimeter charges and an adjacent outer row of central charges is about equal. The combination of spacing distance and powder factor of the central charges is selected to produce a center portion of the fragmented permeable mass having a first average particle size (d/sub 1/) and a first average void fraction (e/sub 1/). The powder factor for each row of perimeter charges and the spacing distance between each outer row of central charges and an adjacent row of perimeter charges is selected to produce a perimeter portion of the fragmented permeable mass having a second particle size (d/sub 2/) and a second void fraction (e/sub 2/), the second average particle size (d/sub 2/) and the second average void fraction (e/sub 2/) being related to the first average particle size (d/sub 1/) and the first average void fraction (e/sub 1/) so that the relation« less
  • A method is described for inducing and maintaining the flow of paraffin-base oil in a well structure. The method comprises heating and maintaining the well structure at a temperature below the fracturing and melting temperature of the paraffin, within that range of temperature where the paraffin is dissolved and/or reabsorbed and carried, in fluid state by the oil and above that chill temperature where the paraffin in the oil solidifies and separates from the oil. (auth)