Gradient distribution surface texture for enhancing the surface heat transfer performance of the mini-channel

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2025-03-13 DOI:10.1016/j.applthermaleng.2025.126237
Zhi Chen , Jiawen Hu , Zhizhong Zhang , Jian Li , Guojun Zhang , Fenglin Han
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Abstract

In the fields of aerospace, microelectronics and automotive, the mini-channel requires the working surfaces with very high heat transfer coefficients to meet extreme heat transfer requirements. In recent years, preparing microstructures on the sample surface has become an emerging method for improving the surface heat transfer performance. However, most studies have focused on the uniform surface microtextures, which cannot maximize the heat transfer performance of the surface. The goal of this study is to improve the heat transfer performance of mini-channel surfaces. Firstly, based on the theories of heat conduction and fluid flow, a thermal-flow coupling model of the mini-channels with surface microtextures is established. Secondly, on the basis of the coupled model, the influences of the position, type, size and distribution of microtextures on the heat transfer performance of the mini channel surface are simulated and analyzed. Subsequently, according to the fluid flow and interface heat transfer behavior within the mini-channel, a gradient-distributed surface microtexture is proposed to further improve the heat transfer performance of the mini-channel. Finally, the confirmatory experiments demonstrate that the established thermal-flow coupling model has high accuracy, and the proposed gradient distribution surface texture can significantly improve the heat transfer performance in mini-channels. Compared to the mini-channels with the uniformly distributed surface microstructures, the comprehensive heat transfer evaluation coefficients in mini-channels are increased by 36.5 %. This study can provide a theoretical basis for the preparation of fluid enhanced heat dissipation surfaces in mini-channels.
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在航空航天、微电子和汽车领域,微型通道要求工作表面具有极高的传热系数,以满足极端的传热要求。近年来,在样品表面制备微结构已成为提高表面传热性能的一种新兴方法。然而,大多数研究都集中在均匀的表面微结构上,这无法最大限度地提高表面的传热性能。本研究的目标是改善微型通道表面的传热性能。首先,基于热传导和流体流动理论,建立了带有表面微纹理的微型通道的热流耦合模型。其次,在耦合模型的基础上,模拟和分析了微量污染物的位置、类型、大小和分布对微型通道表面传热性能的影响。随后,根据微型通道内的流体流动和界面传热行为,提出了一种梯度分布的表面微纹理,以进一步提高微型通道的传热性能。最后,实验证实了所建立的热流耦合模型具有很高的准确性,而所提出的梯度分布表面微纹理能显著改善微型通道的传热性能。与表面微结构均匀分布的微型通道相比,微型通道的传热综合评价系数提高了 36.5%。这项研究可为制备流体增强型微型通道散热表面提供理论依据。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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