Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2741
標題: 多孔噴氣流之最佳熱傳孔距比與應用
Optimum Ratio of Jet Spacing-to-Jet Diameter for Confined Impinging Jets with Staggered Arrays in Heat Transfer Applications
作者: 趙士賓
Zhao, Shi-Bin
關鍵字: 多孔噴氣流之最佳熱傳孔距比與應用
Optimum Ratio of Jet Spacing-to-Jet Diameter for Confined Impinging Jets with Staggered Arrays in Heat Transfer Applications
出版社: 機械工程學系
摘要: 本篇論文研究具面板之多孔垂直噴氣流(confined impinging jets)衝擊於等熱通量加熱平板之熱傳現象,主要在深入探討多孔噴氣流在不同高度孔徑比(H/d)下之最佳熱傳孔距孔徑比(s/d),並分別以電子元件和渦輪導向葉片中之冷卻系統為此研究之應用實例,探討噴氣流之冷卻效果。實驗面板之孔道排列採等孔距交錯式(equilaterally staggered array),孔數均為5,孔徑皆固定為3㎜;孔距孔徑比有4、6、8、12、16及24六組;高度孔徑比為2、3及4三種;噴氣流之全溫度(total temperature, )與室溫之溫差控制在1℃之內;衝擊面板上之加熱片由九條寬12.5㎜、厚0.1㎜之不鏽鋼片排列組成,經由不同的串聯方式,可產生37.5㎜、62.5㎜及112.5㎜三組加熱片寬度,亦即加熱片寬度孔徑比(w/d)分別為12.50、29.17及37.50。此研究以直流電源供應器供給 之固定熱通量於加熱片上,中心孔之雷諾數固定為30,000,其相鄰孔之雷諾數分別考慮有30,000、20,000、10,000及0四種情況。
The heat transfer of equilaterally staggered arrays of five confined jets vertically impinging on a flat plate is investigated. The jet diameter is 3mm. The considered ratios of s/d are individually 4, 6, 8, 12, 16 and 24. The ratios of H/d are individually 2, 3 and 4. The difference of jet total temperature and room temperature is controlled within 1℃. The ratio of heating width-to-jet diameter, (w/d), are respectively 12.5, 29.17 and 37.50. The surface heat flux on the heated area is . The Reynolds number of the center jet is 30,000. The Reynolds number of the neighboring jets are individually considered to be 30,000, 20,000, 10,000 and 0. An optimum ratio of jet spacing-to-jet diameter, (s/d)opt, is obtained for various ratios of jet height-to-jet diameter (H/d). Two numerical examples illustrating the applications of jet impingement for cooling are represented.
URI: http://hdl.handle.net/11455/2741
Appears in Collections:機械工程學系所

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