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This paper deals with experimental investigations of heat transfer and friction factor characteristics of perforated pin fin heat sink tested in a rectangular channel by using forced convection. Cylindrical pin fins with conical perforations on the lateral surface area were arranged in staggered arrays on the base plate to form heat sink. Two combinations, such as solid fins and fins with conical perforations, were compared. The effect of number of conical perforations and size of conical perforation on thermal performance of heat sink was studied in detail. The heat sinks were subjected to variable air flow rate (10,000 ≤ Re≥ 30,000) in the turbulent regime and constant heat flux input. The results found that with an increase in the number of conical perforations from 2 to 5 results in higher heat dissipation rates and lower pressure drop. With an increase in the size of conical perforation, heat transfer rate initially increases, attains maximum values and then decreases. This is due to the reduction in vertical heat transfer rate through fin by conduction, which shows adverse effects on the overall heat transfer rate by convection. The purpose of using conical perforation instead of circular perforation was to increasethe velocity of air passing through perforation. This affects the turbulence of working fluid at heatsink and ultimately influences heat transfer rate from heat sink.

Experimental investigations of conical perforations on the thermal performance of cylindrical pin fin heat sink