Thermal-hydraulic analysis and geometric optimization on a microchannel with stacked combinations of ribs and cavities

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Thermal Sciences Pub Date : 2024-10-12 DOI:10.1016/j.ijthermalsci.2024.109456

Liang Du , Ningkang Deng , Jin Yuan , Yongfeng Qu , Zhaoyang Zhang , Wenbo Hu , Hongxing Wang

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Abstract

In order to effectively reduce the operating temperature of electronic devices and improve their working stability and service life, this study has designed the microchannel with stacked combinations of ribs and cavities. The thermal-hydraulic characteristics of microchannel with stacked combinations of cuboid cavities and various rib shapes (1/4 ellipsoid, triangular prism, 1/4 cylinder, trapezoidal prism, and cuboid) were investigated using numerical simulation. Subsequently, their comprehensive performance and energy saving effect were assessed. It is shown that the microchannel with stacked combinations of ribs and cavities not only increases the solid-liquid contact area, but also enhance the mixing efficiency between cold water in the channel center and hot water along the side walls. This improvement helps to reduce temperature and thermal resistance, leading to enhanced heat transfer within the microchannel. As a result, it exhibits excellent comprehensive performance and energy saving effects. When the relative rib width and height ratio of rib to cavity of microchannel with stacked combinations of cuboid cavity and cuboid rib are 0.733 and 0.765, respectively, the figure of merit reaches 2.23, which has high comprehensive performance.

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肋骨和空腔堆叠组合微通道的热液压分析和几何优化

为了有效降低电子设备的工作温度，提高其工作稳定性和使用寿命，本研究设计了肋和腔堆叠组合的微通道。通过数值模拟研究了长方体空腔和不同形状肋条（1/4 椭圆形、三角棱柱、1/4 圆柱、梯形棱柱和长方体）堆叠组合的微通道的热液压特性。随后，对其综合性能和节能效果进行了评估。结果表明，肋片和空腔组合堆叠的微通道不仅增加了固液接触面积，还提高了通道中心冷水与侧壁热水的混合效率。这种改进有助于降低温度和热阻，从而增强微通道内的热传递。因此，它表现出优异的综合性能和节能效果。当长方体空腔和长方体肋条堆叠组合的微通道肋条与空腔的相对肋宽和肋高比分别为 0.733 和 0.765 时，其优值达到 2.23，具有较高的综合性能。

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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.