A novel heatsink with vertical partially-open ducts for natural convection

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-02-14 DOI:10.1016/j.ijthermalsci.2025.109791

Shwin-Chung Wong, An-Cheih Ho, Wun-Chien Huang

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引用次数: 0

Abstract

A novel partially-open-duct heatsink (PODHS) is proposed to enhance natural convection under a vertical orientation. This PODHS maintains an unshrunk virtual chimney effect, associated with an unshrunk volume of the hot plume, above the heatsink as for a closed duct heatsink (CDHS). Simultaneously, it lowers down and uniformizes the temperature of the rising flow in the rear part of a CDHS by swirling in the outside cold air to improve the performance. Above all, this novel PODHS design with a narrow axial opening can be easily manufactured by extrusion. Single-channel computations for convection are conducted for three heatsink samples, a PODHS, a CDHS, and a traditional plate-fin heatsink (PFHS), with common heatsink height of 200 mm, fin width of 2 mm, heatsink base of 3 mm, and fin length of 16 mm. The partial opening widths of the PODHS is 2 mm. The results indicate that the PODHS significantly outperforms a CDHS and the traditional PFHS, especially the latter. Also, a relatively large fin spacing, at least two times of that for the PFHS, can be selected to reduce its weight and cost. Experimental verification of the numerical results is provided by comparing the three different multi-channel heatsinks at two heat transfer rates and one temperature difference between the heatsink base and the ambience.

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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.