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首页> 外文期刊>International Journal of Heat and Mass Transfer >Calculations of transport phenomena and reaction distribution in a polymer electrolyte membrane fuel cell
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Calculations of transport phenomena and reaction distribution in a polymer electrolyte membrane fuel cell

机译：聚合物电解质膜燃料电池中传输现象和反应分布的计算

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摘要

The performance of Polymer Electrolyte Membrane fuel cells depends on the design of the cell as well as the operating conditions. The design of the cell influences the complex interaction of activation effects, ohmic losses, and transport limitations, which in turn determines the local current density. Detailed models of the electrochemical reactions and transport phenomena in Polymer Electrolyte Membrane fuel cells can be used to determine the current density distribution for a given fuel cell design and operating conditions. In this work, three-dimensional, multicomponent and multiphase transport calculations are performed using a computational fluid dynamics code. The computational results for a full-scale fuel cell design show that ohmic effects due to drying of polymer electrolyte in the anode catalyst layer and membrane, and transport limitations of air and flooding in the cathode cause the current density to be a maximum near the gas channel inlets where ohmic losses and transport limitations are a minimum. Elsewhere in the cell, increased ohmic losses and transport limitations cause a decrease in current density, and the performance of the fuel cell is significantly lower than that which could be attained if the ohmic losses and transport limitations throughout the cell were the same as those near the gas channel inlets. Thus overall fuel cell design is critical in maximizing unit performance.
机译：聚合物电解质膜燃料电池的性能取决于电池的设计以及运行条件。电池的设计会影响激活效应，欧姆损耗和传输限制的复杂相互作用，进而决定局部电流密度。聚合物电解质膜燃料电池中电化学反应和传输现象的详细模型可用于确定给定燃料电池设计和运行条件下的电流密度分布。在这项工作中，使用计算流体动力学代码执行三维，多组分和多相输运计算。足额燃料电池设计的计算结果表明，由于阳极催化剂层和膜中聚合物电解质的干燥，以及空气的传输限制和阴极中的溢流导致的欧姆效应导致电流密度在气体附近达到最大值欧姆损耗和传输限制最小的通道入口。在电池的其他地方，增加的欧姆损耗和传输限制导致电流密度降低，并且燃料电池的性能明显低于如果整个电池的欧姆损耗和传输限制与附近的电阻和传输限制相同时所能达到的性能气体通道入口。因此，总体燃料电池设计对于最大化单元性能至关重要。

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