An Investigation on Optimization of Vertical Hollow Hybrid Fin Heat Sinks with Horizontal Bases in Natural Convection

This study investigates the optimization of vertical hollow hybrid fin heat sinks (HHFHSs) with horizontal bases in natural convection. The HHF is a hollow pin fin integrated with radial plate fins, and the HHFHS consists of the staggered array of HHFs and a horizontal base plate. The Nu correlations for the vertical HHF array were developed using a wide range of thermal data generated by CFD analysis and considering modified Ra, fin efficiency, and geometric parameters of the HHF. The optimization of the HHFHS was established by optimizing both the HHF using the least-material method and the fin spacing using the developed Nu correlations. It has been found that the optimal wall thickness of the HHF is a function of fin volume and structural perimeters. The investigation has proven that the optimal fin spacing of the HHFHS depends on the base length. The investigation has revealed that the thermal performance of the optimized HHFHS is superior to the optimized PFHS at a specific fin mass and a consistent base area.