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research-article

Jet Impingement Heat Transfer in Narrow Channels with Different Pin Fin Configurations on Target Surfaces

[+] Author and Article Information
Yu Rao

Institute of Turbomachinery, School of Mechanical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, China
yurao@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039015 History: Received July 27, 2017; Revised January 08, 2018

Abstract

A comparative experimental and numerical study has been done on multiple-jet impingement heat transfer in narrow channels with different pin fin configurations, which include full-height pin fins and miniature pin fins on the target surfaces respectively. Three different target plates including a flat plate, a plate with full-height pin fins and another plate with miniature pin fins are investigated in the jet impingement cooling systems comparatively. The experiments were done under maximum cross flow scheme for the jet Reynolds numbers from 15,000 to 30,000. Narrow jet impingement spacing is kept the same as 1.5 times jet diameter for all the target plates. In the experiments, detailed jet impingement heat transfer characteristics on the flat plate and the full-height-pin-fin plate were obtained by using the transient liquid crystal thermography technique, and additionally steady experiments were done to obtain the overall heat transfer performance of the jet impingement systems with all the three different target plates, which accounts for the heat transfer contribution from the pin fins' surface. Significant overall jet impingement heat transfer enhancement can be obtained with full-height pin fin and miniature pin fin roughened surfaces in the narrow channels. Furthermore, three-dimensional CFD analysis was done to analyze the detailed flow structure and heat transfer characteristics in the jet impingement systems with different pin fin configurations.

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