Numerical analysis of flow heat transfer characteristics and optimization of double-layered microchannel heat sinks with different structures

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-05-19 DOI:10.1016/j.csite.2025.106370

Bo Cai, Pan Hu, Yifan Li, Bingzhi Chen, Haoyang Cai

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Abstract

This paper proposes a novel double-layered microchannel heat sink (TMC-ORTC), specifically, the upper layer consisted of a truncated rectangular microchannel, while the lower layer features a microchannel that combines trapezoidal cavity with oval rib. The flow and heat transfer characteristics of 8 distinct configurations of double-layer microchannel heat sinks (DL-MCHSs) are investigated through numerical simulations at Reynolds numbers (Re) ranging from 150 to 950. Various performance parameters, including pressure drop, friction coefficient, thermal resistance, average Nusselt number (Nu), temperature uniformity, entropy production and heat transfer enhancement factor, are analyzed respectively. The structural parameters of TMC-ORTC are optimized by multi-objective genetic algorithm with thermal resistance, pumping power and temperature uniformity as optimization objectives. The results indicate that the combination of cavity and rib microchannel leverages the benefits of ribs to enhance fluid disturbance and heat transfer, while cavities serve to increase the flow area within the microchannel and reduce pressure drop. Among all the DL-MCHSs studied in this paper, compared with the single arrangement of cavity or rib structure within the microchannel, the combination of cavity and rib structure results in a more pronounced enhancement of the flow and heat transfer performance of the DL-MCHS. The TMC-ORTC outperforms other microchannel heat sinks (MCHSs) in comprehensive performance. When Re = 895.69, compared with the traditional double-layered rectangular microchannel heat sinks (MC-MC), the average Nusselt number of TMC-ORTC has increased by 121.67 %, the temperature uniformity is increased by 81.7 %, the maximum heat transfer enhancement factor is 1.899, the minimum value of augmentation entropy generation number (Ns,a) is 0.89. The optimization results show that when the width of oval rib (Wr) is 0.056 mm and the truncated length of the upper microchannel (Lx) is 1.494 mm, the comprehensive performance of TMC-ORTC is the best.

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不同结构双层微通道散热器流动换热特性数值分析及优化

本文提出了一种新型的双层微通道散热器（TMC-ORTC），即上层由截断的矩形微通道组成，下层由梯形腔和椭圆肋相结合的微通道组成。通过数值模拟研究了8种不同构型的双层微通道散热器（DL-MCHSs）在150 ~ 950雷诺数下的流动和换热特性。分别分析了压降、摩擦系数、热阻、平均努塞尔数（Nu）、温度均匀性、熵产和传热增强因子等性能参数。以热阻、泵送功率和温度均匀性为优化目标，采用多目标遗传算法对TMC-ORTC结构参数进行优化。结果表明：腔肋结合微通道利用了肋的优势，增强了流体扰动和换热，而空腔则增加了微通道内的流动面积，减小了压降。在本文所研究的DL-MCHS中，相较于在微通道内单独布置空腔或肋结构，空腔和肋结构的组合使得DL-MCHS的流动和换热性能得到了更明显的增强。TMC-ORTC在综合性能上优于其他微通道散热器（MCHSs）。当Re = 895.69时，与传统双层矩形微通道散热器（MC-MC）相比，TMC-ORTC的平均努塞尔数提高了121.67%，温度均匀性提高了81.7%，传热增强系数最大值为1.899，增强熵产数（Ns,a）最小值为0.89。优化结果表明，当椭圆肋宽度（Wr）为0.056 mm，上微通道截断长度（Lx）为1.494 mm时，TMC-ORTC的综合性能最好。

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

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.