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Water transport in two-phase fuel ce...

Lee, Eon Soo.

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Water transport in two-phase fuel cell microchannels.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Water transport in two-phase fuel cell microchannels./
Author:	Lee, Eon Soo.
Description:	159 p.
Notes:	Advisers: John K. Eaton; Kenneth E. Goodson.
Contained By:	Dissertation Abstracts International68-09B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3281876
ISBN:	9780549244462

Water transport in two-phase fuel cell microchannels.
Lee, Eon Soo.

Water transport in two-phase fuel cell microchannels. - 159 p.

Advisers: John K. Eaton; Kenneth E. Goodson.

Thesis (Ph.D.)--Stanford University, 2007.

Many fuel cells contain small rectangular channels in which three of the channel walls are smooth, impermeable metal and the fourth wall is a porous gas-diffusion layer. The main function of the channels is to supply reactant gases through the porous layer to the reaction surface, but also to remove water formed by the electro-chemical reactions. Analysis of the two-phase flow through these channels is complicated by the fact that both gas and liquid can move through either the channel or the porous layer. This study presents the flow regime maps for the two-phase flow and a 1-D two-phase flow model for the frictional characteristics of the porous wall bounded channel flow.

ISBN: 9780549244462Subjects--Topical Terms:

783786
Engineering, Mechanical.

Water transport in two-phase fuel cell microchannels.
LDR:03094nam 2200325 a 45 001 939675
005 20110517
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020 $a 9780549244462
035 $a (UMI)AAI3281876
035 $a AAI3281876
040 $a UMI $c UMI
100 1 $a Lee, Eon Soo. $3 1263782
245 1 0 $a Water transport in two-phase fuel cell microchannels.
300 $a 159 p.
500 $a Advisers: John K. Eaton; Kenneth E. Goodson.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6251.
502 $a Thesis (Ph.D.)--Stanford University, 2007.
520 $a Many fuel cells contain small rectangular channels in which three of the channel walls are smooth, impermeable metal and the fourth wall is a porous gas-diffusion layer. The main function of the channels is to supply reactant gases through the porous layer to the reaction surface, but also to remove water formed by the electro-chemical reactions. Analysis of the two-phase flow through these channels is complicated by the fact that both gas and liquid can move through either the channel or the porous layer. This study presents the flow regime maps for the two-phase flow and a 1-D two-phase flow model for the frictional characteristics of the porous wall bounded channel flow.
520 $a Experiments were performed on a straight 200 by 500 micron by 150 mm long rectangular channel. Three walls of the channel were machined into a solid piece of acrylic. One of the 500 micron wide walls was a commercial Toray carbon paper gas-diffusion layer (GDL) material held in place by a flat sheet of acrylic. Water was forced through the GDL layer from four evenly spaced holes in the flat acrylic piece.
520 $a Two-phase flow regime maps were constructed from flow visualization in terms of a superficial gas velocity, JG and the superficial liquid velocity, JL at the channel exit between 0 < JG < 20 m/s and 0 < JL < 10 mm/s. Flow regimes were observed to change from plug flow to stratified flow through an intermediate flow regime as superficial gas velocities increased. The transition from plug flow generally occurs at a constant superficial gas velocity and a two-phase Weber number is proposed as an appropriate dimensionless parameter to characterize this transition.
520 $a A one-dimensional, two-phase flow model was developed which included the effect of air and water flows in both the channel and GDL. The analysis from experimental measurements showed that the product of the friction factor and the gas flow Reynolds number was very nearly a constant, indicating that the model captures the critical physical features of the flow and is useful for the prediction of gas flow rate or pressure drop in a fuel cell microchannel.
590 $a School code: 0212.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0548
690 $a 0759
710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 68-09B.
790 $a 0212
790 1 0 $a Eaton, John K., $e advisor
790 1 0 $a Goodson, Kenneth E., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3281876