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周波

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Chimney Effect on the Fluid Flow and Heat Transfer Characteristics of Finned Heat Sink for LED lamp

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Po Chou

Keywords： chimney effect,free convection,finned heat sink,experiment

Abstract：Using heat sink to increase the cooling area is the most familiar and fundamental method in LED heat management technology.We develop a new configuration of finned heat sink for LED lamp.It is a circular cylinder with many plate fins radially arranged on the external surface.There are many straight ducts inside the peripheral wall of the cylinder.These ducts from the chimney effect to enhance the heat transfer.This work experimentally investigated the chimney effect on the fluid flow and heat transfer characteristics of the finned heat sink for the LED lamp under the free convection state.There are four kinds of test specimens made of aluminum alloy to be employed.The results show that the chimney holes seemed to strengthen the cooling performance at the smaller temperature difference.Besides,the heat transfer enhancemect would be reduced when the height of the heat sink was decreased.

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