THERMAL PERFORMANCE OF FLAT PLATE HEAT SINK WITH ATTACHED HEAT SHIELD

Mohamed R. Shaalan, Mohamed A. Saleh, Osama M. Mesalhy, Mohamed L. Elsayed

Abstract


A parametric study has been carried out to study the effect of design parameters on a new-design feature of using a heat shield on performance of parallel plate fin heat sink. Both numerical and experimental approaches are performed. These parameters include Reynolds number, number of fins, fin height, and shield inclination angle. The attachment of a shield to a heat sink enhances its thermal performance and thermal resistance decreases with increasing Reynolds number, but this effect diminishes at high Reynolds numbers. So, enhancement of thermal performance by a shield is much greater and effective at low Reynolds numbers. Also, variation of shield inclination angle causes complicated variation of the flow field in the space near the heat sink. It is found that the angle of inclination that yields minimum thermal resistance for the case of the lowest fin height, (H=15 mm) ranges from 90-120o, while for higher heat sink height, the optimum angle ranges between 120-135o.

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