CFD Modelling Of Led Heat Sink: Geometric Optimization

Yeow, Yee Sin (2020) CFD Modelling Of Led Heat Sink: Geometric Optimization. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Natural convection heat transfers around a horizontal rectangular heat sink still provide too much of significance in dissipating the waste heat generated by Light Emitting Diode (LED) into the air. The present study aims to propose an efficient heat sink without increasing production cost to obtain better heat transfer rate by natural heat transfer convection without excessive usage of material. An approach that is changing the fin mass distribution across the heat sink under the constraint of a fixed total mass of fin materials has been studied. The numerical results were compared with experimental results and it showed a good agreement. To select the optimal configuration of fins, three different types of heat sink (Flat, Convex, and Concave models) were compared. The flow field pattern around the fins was observed and it can be concluded that decreasing the fin height from the outer side to the inner side of the heat sink can produce a high rate of heat transfer. By comparing the average heat transfer coefficient of the three models, the Concave model is selected as the optimal configuration of fins. This is because the Concave model has more than 20% improvement in the average heat transfer coefficient as compared to the Flat model. Whilst, Convex model has more than 20% reduction in average heat transfer coefficient as compared to the Flat model. Finally, the optimization for the average heat transfer coefficient considering various fin height and heat sink base thickness was performed. It was able to produce a maximum average heat transfer coefficient of 10.4136 W/m2K at optimal settings of fin height and heat sink base thickness.

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