Numerical investigation and optimization of an asymmetric elliptical-cylindrical pin fin heat sink

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-11-12 DOI:10.1016/j.ijthermalsci.2024.109514

S. Gijoy , M.A. Gayathri , S. Rejin , K.E. Reby Roy

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Abstract

A 3D numerical simulation was performed to analyse the heat transfer characteristics of an asymmetric elliptical-cylindrical pin fin heat sink (AECPFHS) in a turbulent flow scenario and to determine the optimum asymmetric elliptical-cylindrical pin fin (AECPF) structure. The investigation is performed in three stages. The numerical procedure and the software tool used in the current research are first validated with another work in which the performance enhancement of a heat sink with staggered cylindrical pin fins (CPFs) was studied. A cylindrical pin fin heat sink (CPFHS) with staggered fins was considered as the reference case. In the next stage, the heat sink with staggered solid-AECPFs (SAECPFs) was simulated, and its performance was compared with the reference case. The highest fin effectiveness obtained was 1.43 for the fin radius (r) to channel height (H) ratio (r/H) = 0.9. This structure was chosen as the base case, and in the third stage, its performance is improved by adding perforation on AECPFs. The influence of nine distinct perforation patterns of three different hole size were selected, and their thermal performance was analysed in detail. The highest fin effectiveness noted for the fins with 8 holes of 3 mm diameter is 2.25 at Re 3111. Furthermore, with the proposed perforated-AECPFHS (PAECPFHS) structure, in comparison to the reference case, the volume of the fins was lowered by as much as 60 %.

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非对称椭圆-圆柱销鳍散热器的数值研究与优化

为分析非对称椭圆-圆柱销鳍散热器（AECPFHS）在湍流情况下的传热特性，并确定最佳非对称椭圆-圆柱销鳍（AECPF）结构，进行了三维数值模拟。研究分三个阶段进行。本研究中使用的数值计算程序和软件工具首先与另一项工作进行了验证，该工作研究了使用交错圆柱销鳍（CPF）提高散热器性能的问题。带交错鳍片的圆柱销鳍散热器（CPFHS）被视为参考案例。在下一阶段，模拟了带有交错实心-AECPFs（SAECPFs）的散热器，并将其性能与参考情况进行了比较。当鳍片半径（r）与通道高度（H）之比（r/H）= 0.9 时，获得的最高鳍片效率为 1.43。选择这种结构作为基本情况，在第三阶段，通过在 AECPF 上增加穿孔来提高其性能。我们选择了三种不同孔径的九种不同穿孔模式，并详细分析了它们的热性能。在 Re 3111 条件下，8 个直径为 3 毫米的穿孔翅片的最高翅片效率为 2.25。此外，与参考情况相比，拟议的穿孔-AECPFHS（PAECPFHS）结构的翅片体积减少了 60%。

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 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.