THERMAL ANALYSIS OF METAL FOAM HEAT SINK SUBJECTED TO IMPINGEMENT JET COOLING

Karima E. Amori, Prof.; A. Khalaf, Deyhaa

	THERMAL ANALYSIS OF METAL FOAM HEAT SINK SUBJECTED TO IMPINGEMENT JET COOLING
Iraqi journal of mechanical and material engineering
Article 1, Volume 15, Issue 1, 2015, Pages 12-30
Authors
Prof. Karima E. Amori; Deyhaa A. Khalaf
Abstract
Jet impingement cooling is critical in many industrial applications (such as manufacturing process, gas turbine blades, etc), since it yields high local or averaged heat transfer coefficient, so a large amount of heat is extracted from hot surface. In this work the thermal characteristic of confined impinging air jet on a hot plate is evaluated experimentally and computationally. The parameters studied were , jet Reynolds number (ranged from 14000 to 70000), angle of impingement jet (0o to 50o measured from vertical axis on the hot plate), and the heat flux subjected on the hot plate (ranged from 1500 to 6000 W/m2). The two – dimensional continuity, Navier-Stockes, energy equations with (k-ε) turbulence model have been solved using finite volume method. The effect of covering the hot plate by a layer of Aluminum metal foam have on the impinging jet cooling of this plate is investigated experimentally for the same studied parameters. The experimental and computational results show that increasing the jet angle decreases the Nussetl no. , while increasing Re no. increases Nusselt no. Utilizing a layer of metal foam on the hot plate enhances the heat transfer by jet cooling by 33 % compared with jet cooling of bare hot plate under the same conditions. A comparison of the present results with the available reported data shows good agreement.
Keywords
Jet Impingement; metal foam; porous heat sink

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