B12-114 Heat Transfer Capacity of Lotus-Type Porous Copper Heat Sink

概要

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Lotus-type porous copper is a porous metal made of copper with many straight pores that are formed by the precipitation of the supersaturated gas dissolved in the melted metal when it is solidified. The lotus-type porous copper is attractive as a heat sink, because the larger heat transfer capacity is obtained as the diameter of the pore is becoming smaller. A fin model for predicting the heat transfer capacity of the lotus-type porous copper was investigated. The heat transfer capacity of it was verified to be predictable from the straight fin model in which heat conduction in the porous metal and the heat transfer to the fluid in the pores are taken into consideration by comparing with the numerical analysis. The heat transfer capacities of the three types of heat sinks with conventional groove fins, groove fins with smaller fin gap (micro-channels) and lotus-type porous copper fins were experimentally and analytically investigated. The conventional groove fins have fin gap of 3mm and fin thickness of 1mm. The micro-channels have fin gap of 0.5mm and fin thickness of 0.5mm. The lotus-type porous copper fins have pores with the diameter of 0.3mm and the porosity of 0.39. The lotus-type porous copper fins were found to have 4 times larger heat transfer capacity than the conventional groove fins and 1.3 times larger than micro-channels heat sink under the same pumping power.
一般社団法人日本機械学会の論文
2003-11-30