Research on flow and heat transfer characteristics of microchannel heat sinks with fan-shaped cavities and circular ribs

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL International Journal of Heat and Fluid Flow Pub Date : 2025-03-01 Epub Date: 2025-01-27 DOI:10.1016/j.ijheatfluidflow.2025.109758

Andong Wu, Qing Cheng, Han Wang

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Abstract

Microchannel heat sinks play a vital role in the heat dissipation of miniaturized and highly integrated electronic devices. In this paper, a novel microchannel heat sinks consisting of fan-shaped cavities and circular ribs (MC-FCR) and the flow and heat transfer characteristics are both studied numerically. With comparation with the traditional smooth straight microchannel (MC), the microchannel with fan-shaped cavities (MC-FC), and the microchannel with circular ribs (MC-CR), the average friction coefficient (f), Nusselt number (Nu) and thermal enhancement efficiency (η) with Reynolds numbers (Re) ranging from 100 to 1000 were mainly studied. The results show that the circular rib structure can increase the degree of turbulence in the microchannel effectively, and the fan-shaped cavity can guide the fluid to form vortices, which bring the average temperature down at least 20 K. In addition, the combination of circular ribs and fan-shaped cavities can improve heat transfer performance while reducing pressure drop, and facilitate the formation of more uniform fluid flow in the channel. Then the relative radius of circular rib (α) and ellipticity (β) are proposed for optimizing the global characteristics of MC-FCR, which results in the thermal enhancement efficiency η for MC-FCR with α = 0.5 and β = 0.5 can achieve 1.431 at Re = 300.

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扇形圆肋微通道散热器流动与换热特性研究

微通道散热片在微型化、高集成化电子器件的散热中起着至关重要的作用。本文对一种由扇形腔和圆形肋组成的新型微通道散热器（MC-FCR）及其流动和传热特性进行了数值研究。通过与传统光滑直线型微通道（MC）、扇形腔微通道（MC- fc）和圆形肋微通道（MC- cr）的对比，重点研究了雷诺数（Re）在100 ~ 1000范围内的平均摩擦系数(f)、努塞尔数（Nu）和热增强效率（η）。结果表明：圆形肋结构可以有效增加微通道内的湍流度，扇形空腔可以引导流体形成涡流，使微通道平均温度降低至少20 K；此外，圆形肋与扇形腔的组合可以在降低压降的同时提高传热性能，并有利于通道内流体流动更均匀的形成。在此基础上，提出了圆肋相对半径（α）和椭圆率（β）对MC-FCR的整体特性进行优化，结果表明，当Re = 300时，α = 0.5和β = 0.5的MC-FCR的热增强效率η可达到1.431。

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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.