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Thermal and Hydrodynamic Performances of Chaotic Mini-Channel: Application to the Fuel Cell Cooling

机译：混沌微通道的热力学和流体力学性能：在燃料电池冷却中的应用

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摘要

Currently, heat exchangers allowing the thermal management of low-temperature fuel cells (PEMFC) are integrated in the bipolar plates and are constituted of a network of straight channels. The flow regime is laminar and thus unfavorable to intense convective heat transfer. In order to increase the power density of the fuel cells, the use of chaotic geometries in the cooling system is envisaged to promote high convective heat transfer. In the present study, several chaotic three-dimensional mini-channels of rectangular cross-section (2 millimeters × 1 millimeter) are evaluated in terms of heat transfer efficiency, mixing properties, and pressure losses. Their performances are compared both to those of the straight channel geometry currently used in the cooling systems of the PEMFC and those of a square-wave mixer. Two Reynolds numbers are considered: 100 and 200. It is shown that a 3-D chaotic channel geometry significantly improves convective heat transfer over that of regular straight or square-wave mixer channels. Of all the geometries studied, one induces higher heat transfer intensification (mean Nusselt number equal to 20) with a strong pressure loss. With an alternative geometry, a better compromise between heat transfer and pressure loss is obtained. However, all of the chaotic geometries present similar mixing rate for the two Reynolds numbers studied.
机译：当前，允许低温燃料电池（PEMFC）的热管理的热交换器集成在双极板中，并且由直通道网络构成。流动状态是层流的，因此不利于强烈的对流传热。为了增加燃料电池的功率密度，设想在冷却系统中使用混沌几何形状以促进高对流热传递。在本研究中，从传热效率，混合特性和压力损失方面评估了几个矩形横截面（2毫米×1毫米）的混沌三维微型通道。将它们的性能与PEMFC冷却系统中当前使用的直通道几何结构以及方波混合器的性能进行了比较。考虑了两个雷诺数：100和200。结果表明，与常规的直线或方波混合器通道相比，3-D混沌通道的几何形状显着改善了对流换热。在所有研究的几何形状中，一个引起较高的热传递强度（平均努塞尔数等于20），并且压力损失很大。通过替代的几何形状，在传热和压力损失之间获得了更好的折衷。但是，对于研究的两个雷诺数，所有混沌几何形状都呈现出相似的混合速率。

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