Local transport phenomena and cell performance of PEM fuel cells with various serpentine flow field designs

被引:121
|
作者
Wang, Xiao-Dong [1 ]
Duan, Yuan-Yuan [2 ]
Yan, Wei-Mon [3 ]
Peng, Xiao-Feng [4 ]
机构
[1] Univ Sci & Technol Beijing, Sch Mech Engn, Dept Thermal Engn, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China
[3] Huafan Univ, Dept Mechatron Engn, Taipei 22305, Taiwan
[4] Tsinghua Univ, Lab Phase Change & Interfacial Transport Phenomen, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
proton exchange membrane fuel cells; serpentine flow field; number of bends; number of serpentine loops; flow channel width ratio;
D O I
10.1016/j.jpowsour.2007.09.009
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
The flow field design in bipolar plates is very important for improving reactant utilization and liquid water removal in proton exchange membrane fuel cells (PEMFCs). A three-dimensional model was used to analyze the effect of the design parameters in the bipolar plates, including the number of flow channel bends, number of serpentine flow channels and the flow channel width ratio, on the cell performance of miniature PEMFCs with the serpentine flow field. The effect of the liquid water formation on the porosities of the porous layers was also taken into account in the model while the complex two-phase flow was neglected. The predictions show that (1) for the single serpentine flow field, the cell performance improves as the number of flow channel bends increases; (2) the single serpentine flow field has better performance than the double and triple serpentine flow fields; (3) the cell performance only improves slowly as the flow channel width increases. The effects of these design parameters on the cell performance were evaluated based on the local oxygen mass flow rates and liquid water distributions in the cells. Analysis of the pressure drops showed that for these miniature PEMFCs, the energy losses due to the pressure drops can be neglected because they are far less than the cell output power. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:397 / 407
页数:11
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