Local transport phenomena and cell performance of PEM fuel cells with various serpentine flow field designs
Local transport phenomena and cell performance of PEM fuel cells with various serpentine flow field designs
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不同蛇形流场设计的质子交换膜燃料电池的局部输运现象和电池性能
DOI：
10.1016/j.jpowsour.2007.09.009
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发表时间：
2008-01
影响因子：
9.2
通讯作者：
Wang, Xiao-Dong
中科院分区：
文献类型：
--
作者：
Peng, Xiao-Feng;Duan, Yuan-Yuan;Yan, Wei-Mon;Wang, Xiao-Dong
双极板流场设计对于提高质子交换膜燃料电池（pemfc）的反应物利用率和液态水去除率具有重要意义。采用三维模型分析了双极板内流道弯道数、蛇形流道数和流道宽度比等设计参数对蛇形流场下微型pemfc电池性能的影响。模型还考虑了液态水的形成对多孔层孔隙度的影响，而忽略了复杂的两相流。预测结果表明：(1)对于单一蛇形流场，随着流道弯道数的增加，电池性能有所提高；(2)单蛇形流场性能优于双蛇形流场和三蛇形流场；(3)随着流道宽度的增加，电池性能提高缓慢。基于局部氧质量流率和电池内液态水分布，评价了这些设计参数对电池性能的影响。压降分析表明，对于这些微型pemfc，由于压降的能量损失远远小于电池的输出功率，因此可以忽略。
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.
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