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research-article

EXPERIMENTAL INVESTIGATION ON CON-VECTIVE HEAT TRANSFER ENHANCEMENT DUE TO LAMINAR SLOT JET IMPINGEMENT IN THE PRESENCE OF POROUS MEDIA

[+] Author and Article Information
Chinige Sampath Kumar

Research scholar, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai
nanisampath@gmail.com

Arvind Pattamatta

Associate Professor, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai
arvindp@iitm.ac.in

1Corresponding author.

ASME doi:10.1115/1.4037540 History: Received January 17, 2017; Revised June 11, 2017

Abstract

An experimental study using the Liquid crystal thermography technique is conducted to investigate the convective heat transfer enhancement due to jet impingement cooling by the presence of porous media. Aluminium porous samples of 10 PPI with permeability 2.48e-7 and porosity 0.95 are used in the present study. Four impinging jet configurations are formed by varying the position of porous media: jet impingement (1) without porous foams (2) over the porous heat sink (3) with porous obstacle case (4) through porous passage. These configurations are evaluated on the basis of the heat transfer enhancement configuration for two different Reynolds number of 400 and 700. Jet impingement with porous heat sink showed a deterioration in the average Nusselt number by 9.95% and 18.04% c compared to jet impingement without porous heat sink configuration for Reynolds number of 400 and 700 respectively. Jet impingement with porous obstacles showed a very negligible enhancement in the average Nusselt number by 3.48% and 2.73% for Reynolds numbers of 400 and 700 respectively. However, jet impingement through porous passage configuration showed enhancement in the average Nusselt number by 52.71% and 74.68% and for stagnation Nusselt numbers by 58.08% and 53.80% compared to the jet impingement without porous medium for Reynolds number of 400 and 700 respectively. Within the porous properties considered, it is observed that by decreasing the permeability and porosity the convective heat transfer performance tends to increase.

Copyright (c) 2017 by ASME
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