点击次数：

论文类型：期刊论文

发表时间：2010-03-01

发表刊物：JOURNAL OF POWER SOURCES

收录刊物：SCIE

卷号：195

期号：5

页面范围：1408-1415

ISSN号：0378-7753

关键字：Gas diffusion layer; Water management; Liquid water configuration

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.