Open Access

ARTICLE

Thermo-Hydraulic Performances of Microchannel Heat Sinks with Different Types of Perforated Rectangular Blocks

by Heng Zhao¹, Honghua Ma², Hui Liu¹, Xiang Yan¹, Huaqing Yu¹, Yongjun Xiao¹, Xiao Xiao^3,*

1 School of Physics and Electronic Information Engineering, Hubei Engineering University, Xiaogan, 432000, China
2 Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan, 430074, China
3 Institute of Engineering and Technology, Hubei University of Science and Technology, Xianning, 437100, China

* Corresponding Author: Xiao Xiao. Email:

Fluid Dynamics & Materials Processing 2025, 21(1), 87-105. https://doi.org/10.32604/fdmp.2024.056577

Received 25 July 2024; Accepted 25 October 2024; Issue published 24 January 2025

Abstract

The behavior of single-phase flow and conjugate heat transfer in micro-channel heat sinks (MCHS) subjected to a uniform heat flux is investigated by means of numerical simulations. Various geometrical configurations are examined, particularly, the combinations of rectangular solid and perforated blocks, used to create a disturbance in the flow. The analysis focuses on several key aspects and related metrics, including the temperature distribution, the mean Fanning friction factor, the pressure drop, the Nusselt number, and the overall heat transfer coefficient across a range of Reynolds numbers (80–870). It is shown that the introduction of such blocks significantly enhances the heat transfer performances of the MCHS compared to the straight-through flow channel. Specifically, a case is found where the Nusselt number increases by 2.3 times relative to the reference case. The integration of perforated blocks facilitates the generation of vorticity within the channel, promoting the mixing of cold and hot fluids. Notably, MCHS incorporating perforated rectangular blocks exhibit more pronounced heat transfer benefits at Reynolds numbers smaller than 400.

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Keywords

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