An Optimum Design Problem in Estimating the Rings Number and Perforated Pins in a Micro Hemispherical Pin Fin Heat Sink

A numerical study was undertaken to evaluate the hydrothermal performance of a heat sink incorporating hemispherical pin fins (HSPFs) augmented with rings under fully turbulent flow conditions, aiming to determine the optimal design configuration. Initially, a heat sink with inline HSPFs was selected as the baseline case, and the numerical approach utilized in this research was validated accordingly. Subsequently, the effect of varying the number of rings attached to the HSPFs was examined, with configurations labeled PFHS ۱ through PFHS ۴. The findings reveal that the PFHS ۴ configuration exhibits superior heat dissipation performance. This configuration was then adopted as the reference case, and in the final stage, its hydrothermal efficiency was further improved by applying perforation techniques. The study meticulously examined the impact of three distinct perforation patterns, each characterized by varying numbers of holes, on hydrothermal performance. These were named as PFHS ۴ (A), PFHS ۴ (B) and PFHS ۴ (C).  The highest hydrothermal performance factor (η) attained was ۱.۳۲ observed for PFHS ۴ (C), representing an approximate increase in performance of ۸.۲۰ % and ۳۲.۱۰% over the PFHS ۴ and HSPF, respectively. Furthermore, the PFHS ۴ (C) configuration, facilitated a considerable reduction in the volume and mass of the heat sink by up to ۹۰ % compared to the recent data from the literature.

کلیدواژه ها:

Heat sink ، Rings ، Perforation ، Heat transfer ، fluid flow