자연 대류 및 복사에서의 중공 하이브리드 휜 히트 싱크

Abstract

Advances in electronic and telecommunication equipment have led to smaller chip size and higher performance. These forced the cooling system to cope with the increasing waste heat flux to maintain the overall system performance and reliability. Lightweight passively cooled heat sink is an interesting choice if such equipment are located in remote or hard to reach area. Therefore, research and development of lightweight high-performance heat sinks are important to manage the ever-increasing heat dissipation rates.

This thesis summarizes the analytical and numerical investigation of natural convection hollow hybrid fin heat sink with and without radiation under various parametric conditions. First, several parametric conditions such as radial plate fin number, radial plate fin width, radial plate fin length, perforation number, and fin spacing were numerically studied. Second, Nusselt number correlation under purely natural convection was numerically developed and validated to optimize the hollow hybrid fin heat sinks (HHFHSs). Thirty six heat sink configurations were analyzed to ensure a broad range of data. Third, an analytical model to predict the hollow hybrid fin (HHF) heat dissipation was derived and compared to numerical result.

The overall results show that surface area enlargement from the radial plate fin has positive impact on both the thermal resistance and the mass-multiplied thermal resistance. The HHFHS with single perforation shows the best thermal performance. Extending the fin height effectively improve the thermal performance up to 75 mm. These attractive results show the viability of HHFHS as an advanced lightweight cooling system.