Study on water transport in PEM of a direct methanol fuel cell

被引：7
|
作者：
Shi, M. H. [1 ]
Wang, J. [1 ]
Chen, Y. P. [1 ]
机构：
[1] Southeast Univ, Dept Power Engn, Nanjing 210096, Peoples R China
来源：
JOURNAL OF POWER SOURCES | 2007年 / 166卷 / 02期
关键词：
direct methanol fuel cell; porous media; water transport; dry-out; two-phase flow;
D O I：
10.1016/j.jpowsour.2006.12.036
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：
Water transport phenomenon in PEM and the mechanism of occurrence and development of a two-phase countercurrent flow with corresponding transport phenomenon in the PEM are analyzed. A one-dimensional steady state model of heat and mass transfer in porous media system with internal volumetric ohmic heating is developed and simulated numerically. The results show that two dimensionless parameters D and N, which reflect the liquid water flow rate and inner heat source in the PEM, respectively, are the most important factors for the water fraction and thermal balance in the PEM. The saturation profiles within the two-phase region at various operating modes are obtained. Smaller mass flow rate of liquid water and high current density are the major contributions to the membrane dehydration. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：303 / 309
页数：7
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