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首页> 外文期刊>Journal of power sources >Experimental and numerical comparison of water transport in untreated and treated diffusion layers of proton exchange membrane (PEM) fuel cells
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Experimental and numerical comparison of water transport in untreated and treated diffusion layers of proton exchange membrane (PEM) fuel cells

机译：质子交换膜（PEM）燃料电池未处理和已处理扩散层中水传输的实验和数值比较

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In this paper, a fluorescein solution is injected into the gas diffusion layer (GDL) of a PEM fuel cell to simulate water flow through the porous medium under flooding conditions. The effect of the GDL hy-drophobic treatment is studied by analyzing the images obtained from fluorescence microscopy. The intensity of images is correlated to the liquid water content in the medium. As a result, three distinguishable patterns are recognized between the treated and untreated GDL samples. These patterns include: (1) initial invasion, (2) progression and (3) pore filling. Based on the flow characteristics, a pore-network model is developed and applied to unique network geometry with different hydrophobic fractions to study the effect of hydrophobicity on the flow configuration. It is shown that the model predicts the flow configurations which are qualitatively in agreement with the experimental observation. The model is then used to obtain saturation for samples with different hydrophobic fractions. The trend is in agreement with the results reported in the past
机译：在本文中，将荧光素溶液注入PEM燃料电池的气体扩散层（GDL）中，以模拟溢流条件下水流过多孔介质的情况。通过分析从荧光显微镜获得的图像，研究了GDL疏水处理的效果。图像的强度与介质中的液态水含量相关。结果，在处理过的和未处理过的GDL样品之间可以识别出三种不同的模式。这些模式包括：（1）初始侵袭，（2）进展和（3）毛孔充盈。基于流动特性，开发了孔隙网络模型，并将其应用于具有不同疏水分数的独特网络几何形状，以研究疏水性对流动构型的影响。结果表明，该模型可以预测出与实验观测结果相吻合的流动形态。然后使用该模型获得具有不同疏水分数的样品的饱和度。趋势与过去报告的结果一致

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