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首页> 外文期刊>International Journal of Heat and Mass Transfer >Flow field plates with trap-shape channels to enhance power density of polymer electrolyte membrane fuel cells
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Flow field plates with trap-shape channels to enhance power density of polymer electrolyte membrane fuel cells

机译：具有陷阱形通道的流场板，可增强聚合物电解质膜燃料电池的功率密度

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摘要

Power density of proton exchange membrane fuel cells (PEMFCs) can be enhanced by optimal design of the shape and dimensions of bipolar plate channels. By introducing a novel, trap-shape channel design, the present work investigates the impact of having smaller land widths at different cross-sections of each bipolar plate on the PEMFC performance. The possible capabilities of this trap-form channel are investigated through a three-dimensional non-isothermal model in ANSYS Fluent.It is found that having narrower lands at a number of plate cross-sections enhances the current density per unit active area. However, there are critical (optimum) values for both length and number of these traps where the PEMFC performance is maximized. The results show that channels with two 8-mm-long traps provide considerably higher current densities. These two-trap channels also improve the distribution of oxygen and water over the cathode catalyst, which consequently results in less cathodic overpotential across the cell. As a result, the proposed trap-shape channel significantly enhances the power density while being as simple and inexpensive as the conventional/classical straight (no-trap) channels for fabrication. This new, trap shape of channels can therefore be considered one of the promising channel designs for the next generation of PEMFCs. (C) 2018 Elsevier Ltd. All rights reserved.
机译：质子交换膜燃料电池（PEMFC）的功率密度可通过优化设计双极板通道的形状和尺寸来提高。通过介绍一种新颖的陷阱形通道设计，本工作研究了在每个双极板的不同横截面处具有较小焊盘宽度对PEMFC性能的影响。通过ANSYS Fluent中的三维非等温模型研究了这种陷阱形式通道的可能功能，发现在许多板横截面上具有更窄的焊盘可以提高单位有效面积的电流密度。但是，对于这些陷阱的长度和数量都有关键（最佳）值，可以使PEMFC性能最大化。结果表明，带有两个8毫米长陷阱的通道可提供更高的电流密度。这些两个阱的通道还改善了氧气和水在阴极催化剂上的分布，因此减少了整个电池的阴极超电势。结果，所提出的阱形通道显着提高了功率密度，同时与用于制造的常规/经典直（无阱）通道一样简单且便宜。因此，这种新的陷阱形通道可以被认为是下一代PEMFC的有前途的通道设计之一。 （C）2018 Elsevier Ltd.保留所有权利。

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