An approach for determining the liquid water distribution in a liquid-feed direct methanol fuel cell

被引:11
|
作者
Yang, W. W. [1 ]
Zhao, T. S. [1 ]
Chen, R. [1 ]
Xu, C. [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Mech Engn, Kowloon, Hong Kong, Peoples R China
关键词
Direct methanol fuel cell (DMFC); Water crossover; Liquid saturation; Two-phase mass transport model; MASS-TRANSPORT MODEL; POLYMER-ELECTROLYTE MEMBRANES; FLOW-FIELD DESIGN; 2-PHASE FLOW; PERFORMANCE; SATURATION; TRANSIENT;
D O I
10.1016/j.jpowsour.2009.01.059
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
In determining the liquid water distribution in the anode (or the cathode) diffusion medium of a liquid-feed direct methanol fuel cell (DMFC) with a conventional two-phase mass transport model, a current-independent liquid saturation boundary condition at the interface between the anode flow channel and diffusion layer (DL) (or at the interface between the cathode flow channel and cathode DL) needs to be assumed. The numerical results resulting from such a boundary condition cannot realistically reveal the liquid distribution in the porous region, as the liquid saturation at the interface between the flow channel and DL varies with current density. In this work, we propose a simple theoretical approach that is combined with the in situ measured water-crossover flux in the DMFC to determine the liquid saturation in the anode catalyst layer (CL) and in the cathode CL. The determined liquid Saturation in the anode CL (or in the cathode CL) can then be used as a known boundary condition to determine the water distribution in the anode DL (or in the cathode DL) with a two-phase mass transport model. The numerical results show that the water distribution becomes much more realistic than those predicted with the assumed boundary condition at the interface between the flow channel and DL. (c) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:216 / 222
页数:7
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