Please use this identifier to cite or link to this item: `http://hdl.handle.net/11455/1612`
 標題: 具面板多孔噴氣流中噴泉效應與干擾現象對熱傳之影響Effect of Jet Fountain and Jet Interaction on Heat Transfer for Impinging Air Jets with Staggered Arrays 作者: 賴茂德 關鍵字: fountain effect;噴泉效應;jet interaction;confined impinging jets;stagnation Nusselt number;干擾現象;多孔噴氣流;停滯點紐塞數 出版社: 機械工程學系 摘要: 本篇論文研究具面板之多孔噴氣流(confined impinging jets)垂直衝擊於等熱通量加熱平板之熱傳現象，主要在深入研究多孔噴氣流中噴泉效應(Fountain effect)與干擾現象(Jet interaction)對停滯點紐塞數(stagnation Nusselt number, Nusg)之影響，並探討在不同高度孔徑比(H/d)下之最佳熱傳孔距孔徑比(s/d)。實驗面板之孔道排列採等孔距交錯式(equilaterally staggered array)，孔數為5，孔徑固定為3㎜；孔距孔徑比有4、6、8、12及16等五組；高度孔徑比為2、2.5、3、3.5、4、5及6等七種；噴氣流之全溫度(total temperature, )與室溫控制在24℃；加熱片固定在 ；加熱片之寬度孔徑比(w/d)為29.17；雷諾數( ) 之變化則有30,000、20,000及10,000三種。此實驗量測所得之停滯點紐塞數並以迴歸分析法表示為H/d，s/d與Re之函數。The effect of jet-to-jet spacing on local Nusselt number for confined circular air jets vertically impinging on a flat plate is investigated. Five jets in equilaterally staggered arrays are considered. The surface heat flux on the plate is 1500 . The jet diameter is 3 mm. Three different jet Reynolds numbers (Re = 10,000 , 20,000 and 30,000) are individually considered. The influence of jet-to-jet spacing, Re and jet height on the stagnation Nusselt number of the center jet is experimentally investigated. The ratio of jet-to-jet spacing to jet diameter (s/d) is in the range of 4 to 16. The ratio of jet height-to-jet diameter (H/d) is in the range of 2 to 6. The ratio of heating width-to-jet diameter (w/d) is 29.17. The jet total temperature is 24℃. An optimum ratio of jet-to-jet spacing to jet diameter is obtained. The existence of the optimum ratio of jet-to-jet spacing to jet diameter is attributed to jet interference before impingement and/or jet fountain. The stagnation Nusselt number is curvefitted as a polynomial with Re, s/d and H/d as the variables. URI: http://hdl.handle.net/11455/1612 Appears in Collections: 機械工程學系所

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