Liquid water transport mechanism in the gas diffusion layer

被引：55

作者：

Zhou, P. ^{[1
]}

Wu, C. W. ^{[1
]}

机构：

[1] Dalian Univ Technol, Fac Vehicle Engn & Mech, Dept Engn Mech, State Key Lab Struct Anal Ind Equipment, Dalian 116024, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2010年 / 195卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Gas diffusion layer; Water management; Liquid water configuration; PEM FUEL-CELL; LATTICE BOLTZMANN METHOD; MICROSCALE FLOW SIMULATION; PERFORMANCE; MANAGEMENT; EXCHANGE; EQUATION; POROSITY; MEDIA; MODEL;

D O I：

10.1016/j.jpowsour.2009.09.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We developed an equivalent capillary model of a microscale fiber-fence structure to study the microscale evolution and transport of liquid in a porous media and to reveal the basic principles of water transport in gas diffusion layer (GDL). Analytical solutions using the model show that a positive hydraulic pressure is needed to drive the liquid water to penetrate through the porous GDL even consisting of the hydrophilic fibers. Several possible contributions for the water configuration, such as capillary pressure, gravity, vapor condensation, wettability and microstructures of the GDL, are discussed using the lattice Boltzmann method (LBM). It is found that the distribution manners of the fibers and the spatial mixed-wettability in the GDL also play an important role in the transport of liquid water. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1408 / 1415

页数：8

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