Optimization of heatsink geometry by CFD and CCD

Gok, Wei Keong (2021) Optimization of heatsink geometry by CFD and CCD. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The traditional flat plate heat sink design is still mainly used in the cooling of electronic components. The present study aims to propose a better heat sink design under a fixed mass constraint of fin distribution. The numerical results of CFD simulation for flat plate heat sink were compared with experimental results and numerical results done by previous researchers. The results showed a good agreement as the percentage difference is 3.92%, which is deemed acceptable. Three different heat sink designs, namely Flat, Convex, and Concave, are made, and their average heat transfer coefficient is compared with the Flat type heat sink being the reference model. The flow field pattern around the fins was observed, and it was found that increasing the fin mass distribution towards the side where it faces the inlet air can result in a high rate of heat transfer. Upon comparing the three designs, the Concave type heat sink has the highest average heat transfer coefficient with 26.65% better performance than the Flat type heat sink at ΔT =55K. On the other hand, Convex type heat sink has a reduction of 30.33% in average heat transfer coefficient compared to the Flat type heat sink at ΔT = 55K. Finally, the best design of heat sink is predicted using the CCD method. The best design has an average heat transfer coefficient of 6.2502 W/m2K at an optimal setting of two factors: amplitude of wavelength and heat sink base thickness.

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