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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >POROUS MATERIALS AS FLUID DISTRIBUTORS IN POLYMER ELECTROLYTE FUEL CELLS A COMPUTATIONAL PERFORMANCE ANALYSIS
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POROUS MATERIALS AS FLUID DISTRIBUTORS IN POLYMER ELECTROLYTE FUEL CELLS A COMPUTATIONAL PERFORMANCE ANALYSIS

机译：多孔材料在高分子电解质燃料电池中作为流体分布体的计算性能分析

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摘要

Commonly used ribbed flow-fields such as parallel and serpentine flow-fields in polymer electrolyte fuel cells (PEFC) exhibit limited mass transfer to the part of the diffusion and catalyst layer which is not covered by flow channels, leading to a considerably reduced reactant concentration and increased overpotential losses under the current collector shoulders. In this study, a novel concept is investigated, according to which the traditional ribbed flow delivery systems are replaced with permeable porous fluid distributors, which circumvent drawbacks such as those mentioned earlier. A complex mathematical model, including the conservation of mass, momentum, energy, species and electric current, using Butler-Volmer kinetics for electrochemical reaction rates, is numerically solved in three dimensions, to investigate the impact of different flow configurations on the performance of hydrogen fuel cells. It is found that cells with porous gas distributors generate substantially higher current densities and therefore are more advantageous with respect to mass transfer. Reduction in stack weight is another strong argument for using porous flow distributors in future applications.
机译：聚合物电解质燃料电池（PEFC）中常用的肋状流场（例如平行流和蛇形流场）向扩散和催化剂层的未被流道覆盖的部分表现出有限的质量传递，从而导致反应物浓度大大降低并在集电器的肩膀下增加了超电势损失。在这项研究中，研究了一种新颖的概念，根据该概念，传统的带肋流输送系统被可渗透的多孔流体分配器所取代，该分配器可避免诸如先前所述的缺点。使用Butler-Volmer动力学计算电化学反应速率，建立了一个复杂的数学模型，包括质量，动量，能量，物质和电流的守恒，在三个维度上进行了数值求解，以研究不同流动配置对氢气性能的影响燃料电池。发现具有多孔气体分配器的电池产生明显更高的电流密度，因此在传质方面更有利。减少烟囱重量是在将来的应用中使用多孔流量分配器的另一个强有力的论据。

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