| 摘要: |
| 为了在提高锯齿型翅片散热器换热性能的同时尽量控制压降损失的增大，本文采用数值模拟的方法对锯齿型翅片性能进行研究，分析了不同翅片表面、迎风面结构及尺寸参数对传热Nu、流动压降损失Δp以及综合性能η的影响规律。结果表明：无论翅片表面设置何种形状凹槽和凸起对传热的影响差异较小，但圆形凹槽和凸起对压降损失的增加最少，综合性能最优。在翅片表面设置圆形凹槽和凸起的基础上继续将翅片两端迎风面改为圆形，可使传热提高的同时减小压降损失，综合性能最多提高12.2%。圆形凹槽和凸起尺寸R=0.15 mm时，传热和压降损失的平衡达到最佳，与传统锯齿型翅片相比，平均压降损失基本不变，传热和综合性能平均提高均为8.7%。 |
| 关键词: 锯齿型翅片 表面传热系数 强化传热 结构参数 |
| DOI： |
| Received:October 21, 2022Revised:December 01, 2022 |
| 基金项目:中国博士后科学基金(2020M682206)资助项目。 |
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| Enhanced Heat Transfer Study of Serrated Fins Based on Surface and Windward Surface Modification |
|
Zhang Xilong, Hou Shuo, Zhang Yongliang, Dong Wenlin, Fang Yubao
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| (College of Mechanical and Automotive Engineering, Qingdao University of Technology) |
| Abstract: |
| The properties of new serrated fins were numerically investigated to improve the heat transfer properties of a serrated fin radiator while controlling the increase in pressure drop loss. The effects of different fin surfaces, windward surface structures, and dimensional parameters on the heat transfer Nusselt number Nu, pressure loss Δp, and overall performance η were analyzed. The results indicate that the heat transfer performance has a trivial dependence on the shape of the grooves or bumps on the fin surface; however, the circular shape has the least increase in pressure loss and the best overall performance. Owing to the circular grooves and bumps on the fin surface, the windward surfaces of the fin are changed to circular; this can improve heat transfer, reduce pressure loss, and improve overall performance by as much as 12.2%. The balance between heat transfer and pressure loss is optimal for the circular grooves and a bumps size R = 0.15 mm, and the average pressure loss remains the same as that of the conventional serrated fin, with an average improvement of 8.7% in both heat transfer and overall performance. |
| Key words: serrated fins surface coefficient of heat transfer enhanced heat transfer structural parameters |
