Experimental study of dielectric liquid spray cooling on multi-scale structured surfaces inspired by leaf veins

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2024-08-30 DOI:10.1016/j.ijheatfluidflow.2024.109554

Jiajun Chen , Xiufang Liu , Fuhao Zhong , Qingshuo Miao , Wanhong Jia , Mian Zheng , Yanan Li , Yu Hou

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Abstract

Dielectric liquid spray cooling is a promising way to dissipate heat of high-power electronic devices. Surface modification is a most cost-effective method to enhance spray cooling. Inspired by leaf veins, this paper designs and fabricates macro-scale, micro- and nano- scale, and multi-scale structured surfaces for dielectric liquid spray cooling. The cooling characteristics are tested on a two-phase spray cooling system using HFE-7100. The results reveal that the heat transfer is enhanced on all the structured surfaces. Two bionic leaf vein structures, reticulated veins and parallel veins, are designed for macro-scale structured surfaces. The results show that the former one is superior to the other thanks to its better liquid distribution. For the micro- and nano- scale structured surfaces, due to the larger surface area and higher thermal conductivity, the graphene coating outperforms the carbon nanotube coating in heat transfer. Multi-scale structured surfaces, featured with leaf veins and micro- and nano- coatings, further enhance heat transfer. The heat flux increases by 116 % compared with that of the smooth surface. The evaporation efficiency reaches 60 % at the surface temperature of 80 °C. Furthermore, the effect of surface temperature on the enhancement ratio of heat transfer is analyzed, revealing various enhancement mechanisms of different scaled structured surfaces.

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受叶脉启发在多尺度结构表面上进行介质液体喷雾冷却的实验研究

电介质液体喷雾冷却是一种很有前途的大功率电子设备散热方法。表面改性是提高喷雾冷却效果最经济有效的方法。受叶脉的启发，本文设计并制造了宏观尺度、微米尺度、纳米尺度和多尺度的结构表面，用于电介质液体喷雾冷却。在使用 HFE-7100 的两相喷雾冷却系统上测试了冷却特性。结果表明，所有结构表面的传热都得到了增强。为大尺度结构表面设计了两种仿生叶脉结构：网状叶脉和平行叶脉。结果表明，前者的液体分布更好，因此优于后者。对于微米和纳米级结构表面，由于石墨烯涂层具有更大的表面积和更高的热传导率，因此在传热方面优于碳纳米管涂层。以叶脉和微纳米涂层为特征的多尺度结构表面进一步增强了传热效果。与光滑表面相比，热通量增加了 116%。在表面温度为 80 °C 时，蒸发效率达到 60%。此外，还分析了表面温度对传热增强率的影响，揭示了不同尺度结构表面的各种增强机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.