Numerical Study on Performance of PEMFC with Block and Sub-channel of Cathode Flow Field

被引:0
|
作者
Jo, Seonghun [1 ]
Kim, Junbom [1 ]
机构
[1] Univ Ulsan, Sch Chem Engn, Ulsan 44610, South Korea
来源
APPLIED CHEMISTRY FOR ENGINEERING | 2021年 / 32卷 / 06期
关键词
PEMFC; Numerical analysis; Baffle blockage; Sub-channel; Oxygen concentration; FUEL-CELL; BIPOLAR PLATES; TRANSPORT;
D O I
10.14478/ace.2021.1077
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A flow channel shape of PEMFC has an influence on the internal flow uniformity. If the reactant distribution in a flow path is not uniform during operation, both catalyst deactivation and mechanical damage of membrane could occur resulting in decreasing the membrane electrode assembly (MEA) durability. Numerous studies concerning flow design have been conducted to make smooth supply and uniform distribution of reactants in fuel cells. The baffle of flow path could improve fuel cell performance through the forced convection effect. A sub-channel, as an additional air flow path, could increase the reactant concentration and reduce the mass transfer loss via a smooth water discharge. In this study, computational fluid dynamics (CFD) was used to analyze the effect of blocks and sub-channels on the current density and oxygen concentration of the fuel cell. As a result, the limit current density and oxygen concentration at a rear block increased when using blocks and sub-channels in a flow channel. In particular, the current density increased significantly when the sub-channel was placed between two blocks. Also, the sub-channel position was optimized by analyzing the oxygen concentration, and the oxygen concentration was recovered at a rear block in the fuel cell.
引用
收藏
页码:613 / 620
页数:8
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