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Numerical study of liquid jet impingement flow and heat transfer of a cone heat sink

Zhiguo Tang (School of Mechanical Engineering, Hefei University of Technology, Hefei, China)
Hai Li (School of Mechanical Engineering, Hefei University of Technology, Hefei, China)
Feng Zhang (School of Mechanical Engineering, Hefei University of Technology, Hefei, China)
Xiaoteng Min (School of Mechanical Engineering, Hefei University of Technology, Hefei, China)
Jianping Cheng (School of Mechanical Engineering, Hefei University of Technology, Hefei, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 26 September 2019

Issue publication date: 17 October 2019

279

Abstract

Purpose

The purpose of this paper is to explore the flow and heat transfer characteristics of the jet impingement onto a conical heat sink and evaluate the ability of heat transfer enhancement.

Design/methodology/approach

A numerical study of the flow and heat transfer of liquid impingement on cone heat sinks was conducted, and transition SST turbulence model was validated and adopted. The flow and thermal performances were investigated with the Reynolds number that ranges from 5,000 to 23,000 and cone angle that ranges from 0° to 70° in four regions.

Findings

Local Nusselt numbers are large, and pressure coefficients drop rapidly near the stagnation point. In the conical bottom edge, a secondary inclined jet was observed, thereby introducing a horseshoe vortex that causes drastic fluctuations in the curves of the flow and heat transfer. The average Nusselt numbers are higher in a conical protuberance than in flat plates in most cases, thus indicating that the heat transfer performance of jet impingement can be improved by a cone heat sink. The maximum increase is 13.6 per cent when the cone angle is 60°, and the Reynolds number is 23,000.

Originality/value

The flow and heat transfer behavior at the bottom edge of the cone heat sink is supplemented. The average heat transfer capacity of different heat transfer radii was evaluated, which provided a basis for the study of cone arrays.

Keywords

Acknowledgements

This work was supported by the project of the National Science and Technology Supporting Plan [Grant No. 2014BAG06B02] and the massive project of the Science and Technology Department in Hefei City, Anhui Province [Grant No. KX201506230108].

Citation

Tang, Z., Li, H., Zhang, F., Min, X. and Cheng, J. (2019), "Numerical study of liquid jet impingement flow and heat transfer of a cone heat sink", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 11, pp. 4074-4092. https://doi.org/10.1108/HFF-08-2018-0451

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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