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首页> 外文期刊>Numerical Heat Transfer, Part A. Application: An International Journal of Computation and Methodology >Effects of roughness of gas diffusion layer surface on liquid water transport in micro gas channels of a proton exchange membrane fuel cell
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Effects of roughness of gas diffusion layer surface on liquid water transport in micro gas channels of a proton exchange membrane fuel cell

机译：气体扩散层表面粗糙度对质子交换膜燃料电池微气体通道中液态水传输的影响

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摘要

Effects of surface roughness of a gas diffusion layer (GDL) on liquid water transport in a micro gas channel (GC) of a proton exchange membrane fuel cell (PEMFC) are investigated by using the volume of fluid (VOF) method in the commercial CFD package, FLUENT 6.3.26. An array of cubic holes under the GDL surface is used to describe the GDL surface roughness. The simulation results show that a Cassie droplet is inclined to form on the hydrophobic rough GDL surface and the surface roughness greatly affects the transport of the droplet. Effects of GDL surface roughness on forces acting on the droplet are carefully studied, and it is found that GDL surface roughness reduces the retentive forces and increases the detaching forces. In addition, effects of GDL surface roughness on the time required for a droplet to be removed out of the GC, liquid water coverage area ratio on GDL surface, and pressure drop in the GC are explored. The removal time of the water droplet decreases as the GDL roughness increases. The water coverage ratio of the GDL surface decreases as GDL surface roughness increases. The pressure drop in the GC increases as the GDL surface roughness increases.
机译：通过在商用CFD中使用流体体积（VOF）方法研究了气体扩散层（GDL）的表面粗糙度对质子交换膜燃料电池（PEMFC）的微气体通道（GC）中液态水传输的影响包，FLUENT 6.3.26。 GDL表面下方的立方孔阵列用于描述GDL表面粗糙度。仿真结果表明，Cassie液滴倾向于在疏水的粗糙GDL表面上形成，并且表面粗糙度极大地影响了液滴的传输。仔细研究了GDL表面粗糙度对作用在液滴上的力的影响，发现GDL表面粗糙度降低了保持力并增加了分离力。此外，还研究了GDL表面粗糙度对将液滴从GC中除去所需的时间，GDL表面上的液态水覆盖面积比以及GC中的压降的影响。随着GDL粗糙度的增加，水滴的去除时间减少。随着GDL表面粗糙度的增加，GDL表面的水覆盖率降低。随着GDL表面粗糙度的增加，GC中的压降增加。

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