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Study of flow and heat transfer characteristics in a periodic zigzag channel for cooling of polymer electrolyte fuel cells

机译：周期性曲折通道中用于冷却聚合物电解质燃料电池的流动和传热特性的研究

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In this study, a periodic zigzag channel with rectangular cross-section has been used in order to obtain a high-efficiency system for cooling a polymer electrolyte fuel cell. An appropriate function of fuel cells and enhancement of their lifetime require uniform temperature conditions of around 80°C. On the other hand, due to volume and weight constraints, a low-density compact heat exchanger is required, where the coolant fluid is water and the flow regime is laminar with a Reynolds number of 200. In order to consider these problems and increase the heat transfer rate under these conditions, a three-dimensional periodic zigzag channel is employed and the results are compared with the results which have been obtained for the straight channel. The results indicate that the zigzag channel generates chaotic advection and provides a good mixture of the hot fluid adjacent to the wall and the cool fluid away from it. This leads to a uniform temperature distribution along the channel. In addition, the values of Nusselt number and friction coefficient show that average Nusselt number in the zigzag channel is 6.5 times larger than that in the straight channel while the pressure drop remains approximately constant.
机译：在这项研究中，已使用具有矩形横截面的周期性锯齿形通道，以获得用于冷却聚合物电解质燃料电池的高效系统。燃料电池要发挥适当的功能并延长其使用寿命，就需要均匀的温度条件（约80°C）。另一方面，由于体积和重量的限制，需要使用低密度紧凑型热交换器，其中的冷却液为水，流态为雷诺数为200的层流。为了考虑这些问题并增加在这些条件下的传热速率，采用三维周期性的锯齿形通道，并将结果与​​直通道获得的结果进行比较。结果表明，锯齿形通道会产生混乱的对流，并提供与壁相邻的热流体和远离壁的冷流体的良好混合物。这导致沿通道的温度分布均匀。此外，Nusselt数和摩擦系数的值表明，之字形通道中的平均Nusselt数是直线通道中平均Nusselt数的6.5倍，而压降保持大致恒定。

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