Number：

103B_ME1_005

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Name：

Titles：

Author：

鄭澤明、曾憲中、林東震、許冠維

Paper name：

具燒結金屬粒層鰭片與內建馬達風扇之LED冷卻器之設計、製造與熱傳量測

Name of activity：

2014中華民國航太學會學術研討會

2014AASRC Conference

Keywords：燒結金屬粒、鰭片散熱座、自然對流熱傳、混合對流熱傳、實驗、LED冷卻器。

Sintered metal beads，Finned heat sink，Free convection heat transfer，Mixed convection

Heat transfer，Experiment，LED cooling device.

Abstract：

本專題採用粒徑(0.5~0.85mm)之青銅金屬粒，以高溫燒結的方式於紅銅散熱座之各徑向輻射排列之鰭片的兩側面進行薄層燒結，使燒結層能均勻貼附於鰭片表面，形成具燒結金屬粒層鰭片之LED冷卻器，散熱座內部可裝置或不裝置風扇，會對散熱座分別形成混合對流與純粹自然對流熱傳狀態，本專題另以實驗方法探討金屬燒結粒層在上述兩種熱傳狀態下對整體熱傳的影響。實驗組計有片狀(Model B)與條狀式燒結金屬粒層(Model C)之散熱座，以無燒結金屬粒層(Model A)之紅銅散熱座為控制對照組，實驗結果指出，再加熱面溫度與環境溫度之差值△T≈30℃，不裝置風扇之純粹自然對流熱傳狀態下，Model B與Model C之熱阻值非別高出Model A約29%與16%，顯示金屬燒結粒層並無法增強自然對流熱傳；而在裝置風扇之混合對流熱傳狀態下，與不裝風扇的構型相比較，Model A、Model B與Model C的熱阻值分別可以下降約58%、78%與50%，證明加裝風扇能有效增強熱傳，而且片狀燒結金屬粒層(Model B)確實能大幅增益強制對流熱傳、此時Model B之熱阻值比Model A低約31%

This project sintered 0.5~0.85mm-diameetr cooper beads smoothly with the radial plate fins of the copper heat sink by thin layers at high temperature to form a LED cooling device with sintered-metal-beads-layers fins. A motor fan could installed or un-installed into the heat sink，which would result in the mixed convection heat transfer or the pure free convection heat transfer conditions，respectively. This project also experimentally investigated the effect of the sintered-metal-beads layers on the total heat transfer under the above-mentioned two heat transfer conditions. The experimental groups were the plate-shape sintered-metal-beads(Model B)and strip-shape sintered-metal-beads heat sinks(Model C). The pure copper finned heat sink(Model A)was set as the control group. The results demonstrated that the thermal resistances of the Model B and Model C were separately 29% and 16% higher than that of the Model A at the temperature difference between the heated surface and the ambient (△T≈30℃) and the pure free convection heat transfer condition(i.e. the heat sink without motor fan). It reveals that the present sintered-metal-beads layers cannot strengthen the free convection heat transfer. However，by comparing with the heat sinks without motor fan，the Model A，Model B and Model C built-in a motor fan had lower thermal resistances reduced separately by about 58%，78% and 50%. It validates the effect of the built-in motor fan on the heat transfer enhancement，especially for the Model B with the plate-shape sintered-metal-beads heat transfer condition(i.e. the heat sink with a motor fan).