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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >NUMERICAL SIMULATION OF LIQUID WATER BEHAVIOR IN MICROCHANNEL WITH A 90° BEND
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NUMERICAL SIMULATION OF LIQUID WATER BEHAVIOR IN MICROCHANNEL WITH A 90° BEND

机译：弯曲90°的微通道中水行为的数值模拟

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摘要

Water management is an effective way of improving Proton Exchange Membrane (PEM) fuel cell performance and durability. Changing the wettability of gas channel walls and gas diffusion layer (GDL) is one way of controlling the water management in a fuel cell for its influence on the liquid water dynamic behavior. The objective of this study is to investigate liquid water dynamic behavior in a microchannel with a 90° bend and different surface wettability combinations through 3-D numerical simulation. Volume-of-fluid (VOF) method was employed to track the fluid-fluid interface in the multiphase flow. The simulated microchannel has a square cross-section with a dimension of 0.25 mm and a total length of 1.5 mm. Water is introduced to the channel via two pores in the bottom surface representing a GDL while air flows from one end to another. The air and water velocities used are in the order of magnitude of a high current density fuel cell. Nine different combinations of wall/GDL wettability are investigated. The results show that liquid water takes less time to leave the channel in a hydrophilic GDL compared to moderate and hydrophobic GDL regardless of wall wettability. Furthermore, the GDL wettability shows more significant impact on liquid water behavior compared to the wall wettability; however, wall wettability has a slight but considerable impact.
机译：水管理是提高质子交换膜（PEM）燃料电池性能和耐用性的有效方法。改变气体通道壁和气体扩散层（GDL）的润湿性是控制燃料电池中水管理的一种方法，因为它会影响液态水的动态行为。这项研究的目的是通过3-D数值模拟研究90度弯曲和不同表面润湿性组合的微通道中的液态水动力学行为。流体体积（VOF）方法用于跟踪多相流中的流体-流体界面。模拟的微通道具有方形横截面，尺寸为0.25 mm，总长度为1.5 mm。当空气从一端流向另一端时，水通过底表面中代表GDL的两个孔被引入通道。所使用的空气和水的速度为高电流密度燃料电池的数量级。研究了九种不同的墙/ GDL润湿性组合。结果表明，与中性和疏水性GDL相比，液体水花费较少的时间从亲水性GDL中离开通道，而不管壁的润湿性如何。此外，与壁的可湿性相比，GDL的可湿性对液态水行为的影响更大。但是，壁的可湿性会产生轻微但相当大的影响。

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