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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >MEASURING CRITICAL VELOCITY OF WATER DROPLET REMOVAL ON GAS DIFFUSION LAYERS OF PROTON EXCHANGE MEMBRANE FUEL CELLS
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MEASURING CRITICAL VELOCITY OF WATER DROPLET REMOVAL ON GAS DIFFUSION LAYERS OF PROTON EXCHANGE MEMBRANE FUEL CELLS

机译：质子交换膜燃料电池气体扩散层上除水临界流速的测量

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摘要

The production of water on the cathode electrode of proton exchange membrane (PEM) fuel cells may cause problems with flooding or freezing of cell. Therefore, there is a need for water management. This study investigates water droplet removal on the gas diffusion layer by measuring critical velocity-the velocity needed to remove droplets formed above the GDL. A test apparatus was designed for this study, and the effects of droplet diameter, GDL thickness, and PTFE (polytetrafluoroethylene) loading on the critical velocity were studied. When droplet diameter and PTFE loading were increased, a decrease in critical velocity was observed. However, as GDL thickness increased, depending on the PTFE loading, either an increase or decrease in critical velocity was observed. Thus, it was concluded that increased droplet diameter and increased PTFE loading result in lower critical velocities, increasing thickness results in lower critical velocity for low PTFE loadings, and increasing thickness does not have a significant effect on the critical velocity for high PTFE loadings. This work increases the understanding of designing an optimum GDL in the fuel cell, while also providing insight on the critical velocity needed to remove water droplets from the GDL.
机译：在质子交换膜（PEM）燃料电池的阴极上产生水可能会导致电池充满或冻结的问题。因此，需要水管理。这项研究通过测量临界速度（去除GDL上方形成的液滴所需的速度）来研究去除气体扩散层上的水滴。设计了用于该研究的测试设备，并且研究了液滴直径，GDL厚度和PTFE（聚四氟乙烯）负载对临界速度的影响。当液滴直径和PTFE负载增加时，观察到临界速度降低。但是，随着GDL厚度的增加，取决于PTFE的负载量，可以观察到临界速度的增加或减少。因此，可以得出结论，增加液滴直径和增加PTFE负载会导致较低的临界速度，增加厚度会导致较低的PTFE负载的临界速度降低，并且增加厚度不会对较高的PTFE负载的临界速度产生重大影响。这项工作增加了对在燃料电池中设计最佳GDL的理解，同时还提供了从GDL中除去水滴所需的临界速度的见解。

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