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研究生:曾鈴如
研究生(外文):Ling-JuTeseng
論文名稱:矩形鰭片陣列於不同矩形外殼內之熱傳特性的實驗與數值研究
論文名稱(外文):Numerical and Experimental Study of Heat Transfer Characteristic for Rectangular Fin Array in Different Rectangular Enclosure
指導教授:陳寒濤陳寒濤引用關係
指導教授(外文):Han-Taw Chen
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:91
中文關鍵詞:逆算法商業軟體實驗方法熱傳性能矩形鰭片不同高度及外觀矩形外殼
外文關鍵詞:inverse schemecommercial softwareexperimental methodheat-transfer characteristicsplate finsenclosure with openings and fan
相關次數:
  • 被引用被引用:2
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  • 下載下載:12
  • 收藏至我的研究室書目清單書目收藏:0
本文擬以數值逆算法及計算流體力學商業軟體配合實驗方法來探討散熱鰭片,置於不同高度及外觀下之矩形外殼,觀察其熱傳特性及流場分佈情形。依據文獻鰭片上之熱傳係數為不均勻分佈,在進行數值逆算法之前,先將整個鰭片分割成數個小區域,並假設每個小區域上之平均熱傳係數一未知的常數。本文再以有限差分法及合最小平方法(Least squares scheme)配合逆算法,將外界空氣溫度量測值及鰭片溫度量測值帶入逆算法中估算鰭片上之熱傳係數,為了驗證本文數值結果之正確性與可靠性,本文之平均熱傳係數將和相關文獻之經驗公式的結果相比較。再以逆算法估算結果及實驗溫度量測為基準下,選定計算流體力學商業軟體模式來觀察鰭片上之熱傳係數以及矩形外殼內之溫度與速度分佈。從實驗和模擬結果顯示,鰭片上之平均熱傳係數隨著鰭片間距的增加而增加,隨著機殼高度與鰭片高度比值增加而增加,且在有利散熱外觀之矩形外殼下,對於機殼高度與鰭片高度比值跟鰭片間距散熱效果更顯著。為了驗證數值模擬結果之正確性與可靠性,將鰭片量測位置之計算溫度也和模擬溫度相比較。
The present study applies the numerical inverse methods and fluid dynamics simulation software with the measured temperature data to research the heat transfer characteristic of cooling fins which placed in different height and apparent enclosures. Because of non-uniform heat transfer coefficient distribution on the fin. First, whole of plate fin was divided into several regions, and the heat transfer coefficient on each region is assumed to be unknown constant. And then, the measured temperatures is applied to inverse scheme which was in conjunction with Least squares scheme and finite difference. The inverse scheme results were comparative with empirical formula in order to verify the results were reasonable. The simulation model was determined by the criterion of experimental results and inverse results, and the inner enclosure’s flow and temperature field was investigated. The results showed that the average heat transfer coefficient of fins increased with the increase of fin spacing, increase of enclosure’s height and enclosures which was in favor of heat transfer. Specially, under the circumstance of enclosures which was in favor of heat transfer, the effect of fin’s spacing and height of enclosure were more obvious.
摘  要 I
ABSTRACT II
誌  謝 II
目  錄 V
表目錄 VIII
圖目錄 IX
符號說明 IX
第一章緒論 1
1-1 研究背景 1
1-2 文獻回顧 2
1-3 研究目的 4
1-4 研究重點與本文架構 5
第二章逆算法之數值模擬分析 7
2-1 簡介 7
2-2 數學模式之建立 8
2-3 數值分析方法 9
2-4 逆向熱傳導數值法 12
第三章實驗操作 17
3-1 簡介 17
3-2 實驗設備 18
3-3 溫度量測誤差的影響 21
3-4 實驗步驟 21
3-5 實驗組別及操作條件 22
3-6 鰭片上之實驗數據熱物理量 23
第四章實驗數據分析 30
4-1 簡介 30
4-2 逆算法之基底溫度分布與格點分析 30
4-3 實驗結果分析 31
4-3-1 鰭片置於M=0矩形外殼內之熱傳結果分析 31
4-3-2 鰭片置於M=2矩形外殼內之熱傳結果分析 32
4-3-3 比較分析鰭片置於M=2矩形外殼和M=0矩形外殼 33
4-3-4 鰭片置於M=2和風扇矩形外殼內之熱傳結果分析 35
4-3-5 比較分析鰭片置於M=2有無加裝風扇之矩形外殼 36

第五章商業軟體之數值模擬分析 53
5-1 簡介 53
5-2 基本假設 53
5-3 流場模式簡介 54
5-3-1 層流模式 54
5-3-2 零方程模式 54
5-3-3紊流κ-ε模式 55
5-3-4紊流RNG模式 56
5-4 邊界條件與初始條件 57
5-5 軟體設定 58
5-6 模擬結果與討論 59
5-6-1模式的選定 59
5-6-2M=0矩形外殼 60
5-6-3M=2之矩形外殼 61
5-6-4M=2及風扇之矩形外殼 61
5-6-5綜合分析 62
第六章綜合結論與未來展望 82
6-1 實驗與數值模擬結果 82
6-2 綜合結論 83
6-3 未來發展方向與建議 83
參考文獻 84
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