Hydrothermal performance analysis of microchannel heat sink with novel aircraft-shaped varied-section ribs

IF 4.8 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI:10.1016/j.ijheatfluidflow.2026.110298

Hongxin Deng , Guilian Wang , Chunyan Zhao , Dongdong Xie

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Abstract

The hydrothermal performance of the microchannel heat sink with novel aircraft-shaped varied-section ribs (AVSRs) is numerically investigated in the present paper. The AVSR has two distinctive structural features: a streamlined bulge surface and a curved back end. The streamlined bulge surface can induce a remarkable impingement effect in the microchannel, and the curved back end promotes the formation of recirculation in both vertical and horizontal directions. These combine to promote significant convective heat transfer, which improves the cooling efficiency of the heat sink. The AVSR is compared with two rectangular ribs: one has the same length and height as the AVSR (LHR), and the other possesses the same volume (VOR). The microchannel with AVSRs (MC-AVSR) presents an increment of 10.56–61.20 % in Nusselt number (Nu) compared to the smooth microchannel (MC-SC). Meanwhile, the MC-AVSR reveals the implementation of 4.30–45.01 % and 5.39–24.58 % in Nu compared with the microchannel with LHRs (MC-LHR) and VORs (MC-VOR), respectively. Moreover, the apparent friction factor of MC-AVSR is reduced by 1.72–13.92 % and 2.10–3.95 % in comparison with those of MC-LHR and MC-VOR, respectively. These demonstrate that the AVSRs more effectively enhance the thermal performance and also produce less blockage to fluid flow. Moreover, the thermal enhancement factor of MC-AVSR remains larger than 1, indicating that the promoted heat transfer effectiveness consistently offsets the pressure drop penalty induced by the AVSRs.

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新型飞机形变截面肋微通道散热器热液性能分析

本文对新型飞机形变截面肋微通道热沉的热液性能进行了数值研究。AVSR有两个独特的结构特征：流线型凸起表面和弯曲的后端。流线型凸起面在微通道内产生显著的冲击效应，弯曲的后端促进了垂直和水平方向再循环的形成。这些结合起来促进显著的对流传热，从而提高了散热器的冷却效率。将AVSR比作两个矩形肋：一个具有与AVSR相同的长度和高度（LHR），另一个具有相同的体积（VOR）。与光滑微通道（MC-SC）相比，带avsr微通道（MC-AVSR）的努塞尔数（Nu）增加了10.56 ~ 61.20%。与lhr （MC-LHR）和VORs （MC-VOR）微通道相比，MC-AVSR在Nu中的实现率分别为4.30 - 45.01%和5.39 - 24.58%。与MC-LHR和MC-VOR相比，MC-AVSR的表观摩擦系数分别降低了1.72 ~ 13.92%和2.10 ~ 3.95%。这些结果表明，avsr能更有效地提高热学性能，并且对流体流动产生更小的阻塞。此外，MC-AVSR的热增强系数仍然大于1，表明其提升的传热效率始终抵消了avsr引起的压降损失。

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

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.