期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 48, 期 8, 页码 3122-3134出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.10.136
关键词
Heat transfer enhancement; Dimple structure; Cooling channel; Proton exchange membrane fuel cell; High-power density
A novel cooling channel with dimple structures is designed and a three-dimensional PEMFC numerical model is established in this paper. Comparing to the conventional channels, the dimpled channel exhibits a 10% higher heat transfer performance and almost 13% lower pressure loss. The optimization of dimple structure parameters based on uniformity temperature index and heat transfer evaluation criteria is carried out, and it is recommended to use a diameter-to-depth ratio of 4 when the dimple diameter is less than 0.80 mm. The clock-wise vortex observed inside the dimple is considered as the main factor affecting heat exchange. This study will contribute to the design of cooling channels for high-power density PEMFCs in the future.
As the power density of a proton exchange membrane fuel cell (PEMFC) increases, the problems of internal heat accumulation and non-uniform temperature distribution are becoming significant. In this paper, a novel cooling channel with dimple structures is designed and a three-dimensional PEMFC numerical model is established. When comparing to the conventional channels, the heat transfer performance of dimpled channel is 10% higher than the smooth one, and the pressure loss is almost 13% lower than that of wavy channel. In addition, the optimization of dimple structure parameters is investigated based on the index of uniformity temperature (IUT) and performance evalu-ation criteria (PEC) of heat transfer. It is found that a diameter-to-depth ratio of 4 is rec-ommended when the dimple diameter is less than 0.80 mm. Furthermore, the clock-wise vortex observed inside the dimple is considered to be the main reason affecting heat exchange. This study will contribute to the design of cooling channels for high-power density PEMFCs in the future. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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