Numerical and experimental study on heat transfer enhancement in microchannel heat sinks with transverse discontinuities

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-07-16 DOI:10.1016/j.ijthermalsci.2025.110152

Hui Zhu, Yuan-yi Ding, Qi Jin

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Abstract

This study systematically evaluates the thermal enhancement effects induced by transverse discontinuities in rectangular microchannel heat sinks. A microchannel design incorporating uniform discontinuities is proposed to enhance heat transfer efficiency. Numerical simulations and experimental results demonstrate that the introduced discontinuities generate secondary flow vortices, which disrupt and reorganize the boundary layer of the main flow. This phenomenon significantly enhances fluid mixing and local thermal dissipation efficiency, leading to improved heat dissipation and reduced wall temperatures. A dimensionless parameter, the fluid regeneration length-to-discontinuity width ratio (β), is introduced to guide structural optimization. Performance evaluation criteria (PEC) analysis reveals that the optimal configuration occurs with seven discontinuities and β = 7.624, achieving a maximum Nusselt number enhancement of 98.97 %. Compared to conventional continuous microchannels, the proposed design improves overall thermal performance by 54.96 % while effectively balancing heat transfer augmentation and flow resistance penalties.

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横向不连续微通道散热器强化传热的数值与实验研究

本研究系统地评估了矩形微通道散热器中横向不连续引起的热增强效应。为了提高传热效率，提出了一种采用均匀不连续结构的微通道设计。数值模拟和实验结果表明，引入的不连续面会产生二次流涡，对主流边界层进行破坏和重组。这种现象显著增强了流体混合和局部散热效率，从而改善了散热，降低了壁面温度。引入无量纲参数——流体再生长度与不连续面宽度比（β）来指导结构优化。性能评价准则（PEC）分析表明，最优配置出现7个不连续点，β = 7.624，最大Nusselt数增强98.97%。与传统的连续微通道相比，该设计将整体热性能提高了54.96%，同时有效地平衡了传热增强和流动阻力损失。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.