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首页> 外文期刊>Journal of power sources >A study of multi-phase flow through the cathode side of an interdigitated flow field using a multi-fluid model
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A study of multi-phase flow through the cathode side of an interdigitated flow field using a multi-fluid model

机译：使用多流体模型研究流经叉指流场阴极侧的多相流

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摘要

This work presents a study of multi-phase flow through the cathode side of a polymer electrolyte membrane fuel cell employing an interdigitated flow field plate. A previously published model has been extended in order to account for phase change kinetics, and a comparison between the interdigitated flow field design and a conventional straight channel design has been conducted. It is found that the parasitic pressure drop in the interdigitated design is in the range of a few thousand Pa and could be reduced to a few hundred Pa by choosing diffusion media with high in-plane permeability. The additional compressor work due to the increased pressure loss will only slightly increase, and this may be offset by operating at lower stoichiometries as the interdigitated design is less mass transfer controlled, which means that the overall efficiency of the interdigitated arrangement will be higher. In the interdigitated design more product water is carried out of the cell in the vapor phase compared to the straight channel design which indicates that liquid water management might be less problematic. This effect also leads to the finding that in the interdigitated design more waste heat is carried out of the cell in the form of latent heat which reduces the load on the coolant. Finally we see that the micro-porous layer might help keep the gas diffusion layer substrate dry due to a potentially higher evaporation rate caused by a combination of the Kelvin effect and a larger specific surface area compared to the diffusion layer substrate.
机译：这项工作提出了一种多相流通过叉指流场板流经聚合物电解质膜燃料电池阴极侧的研究。为了考虑相变动力学，已经扩展了先前公开的模型，并且已经对叉指式流场设计和常规的直通道设计进行了比较。发现在叉指设计中的寄生压力降在几千帕的范围内，并且通过选择具有高面内渗透性的扩散介质可以将其降低到几百帕。由于压力损失增加而导致的额外压缩机工作量将仅略微增加，这可以通过以较低的化学计量比进行操作来抵消，因为叉指式设计的传质控制较少，这意味着叉指式装置的整体效率将更高。在交错设计中，与直通道设计相比，更多的产品水以气相从电解槽中带出，这表明液态水管理的问题可能较少。该效果还导致发现，在叉指式设计中，更多的废热以潜热的形式从电池中带出，这减少了冷却剂的负荷。最终，我们看到，与扩散层基板相比，由于开尔文效应和更大的比表面积的结合而导致的潜在更高的蒸发速率，微孔层可能有助于使气体扩散层基板保持干燥。

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