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Experimental investigations on liquid water removal from the gas diffusion layer by reactant flow in a PEM fuel cell

机译：通过PEM燃料电池中的反应物流从气体扩散层去除液态水的实验研究

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摘要

The cross flow from channel to channel through gas diffusion layer (GDL) under the land could play an important role for water removal in proton exchange membrane (PEM) fuel cells. In this study, characteristics of liquid water removal from GDL have been investigated experimentally, through measuring unsteady pressure drop in a cell which has the GDL initially wet with liquid water. The thickness of GDL is carefully controlled by inserting various thicknesses of metal shims between the plates. It has been found that severe compression of GDL could result in excessive pressure drop from channel inlet to channel outlet. Removing liquid water from GDL by cross flow is difficult for GDL with high compression levels and for low inlet air flow rates. However, effective water removal can still be achieved at high compression levels of GDL if the inlet air flow rate is high. Based on different compressed GDL thicknesses, different GDL porosities and permeabilities were calculated and their effects on the characteristics of liquid water removal from GDL were evaluated. Visualization of liquid water transport has been conducted by using transparent flow channel, and liquid water removal from GDL under the land was observed for all the tested inlet air flow rates, which confirms that cross flow is practically effective to remove the liquid water accumulated in GDL under the land area.
机译：通道之间通过陆地下方的气体扩散层（GDL）的交叉流动对于质子交换膜（PEM）燃料电池的除水可能起重要作用。在这项研究中，通过测量GDL最初被液态水弄湿的电池中的不稳定压力降，对从GDL中去除液态水的特性进行了实验研究。通过在板之间插入各种厚度的金属垫片来仔细控制GDL的厚度。已经发现，严重的GDL压缩会导致从通道入口到通道出口的压降过大。对于高压缩水平的GDL和较低的进气流量，很难通过错流从GDL中除去液态水。但是，如果进气流量高，则在GDL的高压缩水平下仍然可以实现有效的除水。根据不同的压缩GDL厚度，计算出不同的GDL孔隙率和渗透率，并评估了它们对GDL去除液态水特性的影响。通过使用透明流道进行了液态水输送的可视化，并且在所有测试的进气流量下都观察到了从地面下的GDL去除液态水的情况，这证实了横流实际上可以去除GDL中累积的液态水。在陆地区域之下。

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  • 来源
    《Applied Energy》 |2010年第9期|P.2770-2777|共8页
  • 作者

    Kui Jiao; Jaewan Park; Xianguo Li;

  • 作者单位

    Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo. Ontario, Canada N2L 3d;

    Department of Mechanical and Aeronautical Engineering, University of California, Davis One Shields Ave., Davis, CA 95616, USA;

    rnDepartment of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo. Ontario, Canada N2L 3d;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cross flow; water removal; PEM fuel cell; unsteady pressure drop; transparent flow channel;

    机译：横流;除水;PEM燃料电池;不稳定的压降;透明流道;

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