全国计算流体力学学术研讨会论文格式-建国科技大学.doc

2016中華民國航太學會學術研討會　　　　　　　　　　　　 高雄市岡山，中華民國105年11月5日 2016 AASRC Conference　 　　　　　　 　　　　　　　　　　　 Kangshan Kaohsiung , November 5, 2016 論文編號：YY-XX PAGE 1 內建離心式風扇之圓柱形LED鰭片散熱座之熱傳特性實驗研究 Experimental study of heat transfer characteristics of the cylindrical finned heat sink with built-in centrifugal fan for LED lamp 鄭澤明 曾憲中 王潮熏 黃欣雅 建國科技大學機械工程系暨製造科技研究所 摘要 本研究以實驗方法量測內建離心式風扇之LED散熱座的整體熱傳特性，散熱座以鋁合金製成，其構型為中空圓柱體具12個幅射排列徑向鰭片，散熱座有多個水平通氣孔道連通外界與散熱座的中空腔體，腔體內部置入離心式馬達風扇，且散熱座上端連接之塑膠燈殼上另鑽有六個進氣孔道，結合通氣孔道與離心式馬達風扇導入與排出空氣氣流，可形成強制對流冷卻效果，而散熱座外部徑向鰭片間之類煙囪通道則可形成自然對流散熱，整體熱傳結合兩種對流熱傳機制，必能大幅增益散熱能力。實驗結果證明裝有離心式風扇之散熱座的熱傳能力大幅提升，整體紐塞數(Nu)是不具離心式風扇時的5.74－6.21 倍。 關鍵字：圓柱形散熱座、離心式風扇、LED、對流熱傳。 Abstract This study experimentally measured the total heat transfer characteristics of the LED heat sink with built-in centrifugal fan. The configuration of the aluminum-alloy heat sink was a hollow cylinder with 12 radial fins. Multiple horizontal passages in the heat sink communicated the external environment and the hollow cavity of the heat sink. The cavity was placed inside a centrifugal motor fan. In addition, six holes were drilled at the plastic housing covering above the heat sink. Coupling with these flow passages and the centrifugal motor fan, the efficient forced convection cooling effect was reached. Moreover, the chimney channels among the external fins of heat sink would form the natural convection cooling effect. The total heat transfer, combined with both convection heat transfer mechanisms, should obtain remarkable heat transfer enhancement. Experimental results show that the heat transfer capacity of the heat sink equipped with a centrifugal fan was much better than that without fan. The overall Nusselt number (Nu) of the former was 5.74-6.21 times that of the latter. Keywords: Cylindrical heat sink, Centrifugal fan, LED, Convective heat transfer 前言 近年來在各國政府積極的補貼支持LED燈具替換風潮下，LED照明市場呈現快速成長的趨勢。TrendForce旗下綠能事業處LEDinside必威体育精装版「201