Comparison of pin-fin and finned shape heat sink for power electronics in future aircraft

Abstract

This study investigates the heat transfer performance of finned and pin-fin heat sinks for high power density converter in future aircraft. There is a lack of studies evaluating the cooling performance of pin-fin as compared to the finned heat sink configuration. The influence of the aspects such as type of fluid flow (laminar or turbulent), type of working fluid (fuel or air) and geometry configuration (pin-fin or finned shaped heat sink) on heat transfer performance is compared. Circular, cone and hydrofoil pin fin arrays are considered. It is concluded that the thermal performance of pin-fin heat sink is superior to the finned configuration by 1.6-2 times in all cases except when fuel coolant is employed at turbulent flow. As weight of heat sink is concerned, the use of pin-fin shape can reduce half the weight of heat sink. The results of this paper are the guidance which can be applied while designing the heat sink for power electronics in future aircraft.