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研究生:楊文賓
研究生(外文):Wen-Bin Yang
論文名稱:介電液FC-87與冷媒R-134a對水平圓管的池核沸騰增強熱傳分析
論文名稱(外文):Analysis of Enhanced Nucleate Pool Boiling of FC-87 and R-134a on Horizontal Circular Tubes
指導教授:盧定昶
指導教授(外文):Ding-Chong Lu
學位類別:碩士
校院名稱:國立交通大學
系所名稱:機械工程系
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:1999
畢業學年度:87
語文別:中文
論文頁數:73
中文關鍵詞:介電液FC-87冷媒R-134a池核沸騰增強熱傳
外文關鍵詞:fluorocarbon liquid FC-87refrigerant R-134anucleate pool boilingenhanced heat transfer
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本研究論文主要是探討介電液FC-87與冷媒R-134a的池核沸騰熱傳增強方法。在池沸騰的測試容器中,分別以平滑管、16fpi標準鰭片管、塊狀鰭片管、L型鰭片管、表面噴砂粗糙管、覆網鰭片管及針狀鰭片管共七種不同表面的圓管,以控制電壓及電流的方式對工作流體加熱,在不同飽和壓力下進行水平加熱的池核沸騰實驗,以了解不同結構的熱傳增強表面(enhancement surface)對池核沸騰熱傳性質的影響,進而找出較佳的熱傳增強表面結構及影響池核沸騰熱傳表現的參數。實驗結果顯示:對冷媒R-134a而言,平滑管的實驗熱傳係數由Cooper熱傳關係式可預測90﹪的值於誤差±20%內;由Stephan and Abdelsalam熱傳關係式可預測85﹪的值於誤差35%上限及45%下限內。熱傳效果最佳為針狀鰭片管,其次為L型鰭片管,覆網鰭片管與塊狀鰭片管居中,表面粗糙管與標準鰭片管表現較差。對介電液FC-87而言,可利用Rohsenow關係式,對平滑管沸騰熱傳係數的預測值其實驗值誤差在45%範圍內。針狀鰭片管有最佳的沸騰熱傳係數,其次為L型鰭片管,塊狀鰭片管與標準鰭片管居中,其後為覆網鰭片管與表面粗糙管。

The method of enhanced nucleate pool boiling of dielectric fluorocarbon liquid FC-87 and refrigerant R-134a on horizontal circular tubes were investigated in this study . In order to understand the pool boiling heat transfer characteristics for different enhancement surfaces and the related parameters of the pool boiling heat transfer , the experiments were conducted using a plain tube and six enhanced tubes with the applications of decreasing heat flux at different saturated pressures . The experimental results show that , for refrigerant R-134a , the Cooper correlation can predict 90% of the experimental data of the plain tube within 20% band of uncertainty ; the Stephan and Abdelsalam correlation can predict 85% of the experimental data of the plain tube within 35% upper and 45% lower band of uncertainty . Pin finned tube has the highest heat transfer coefficient and that the L-shaped finned tube have the next highest value , mesh finned tube and segmented finned tube perform worse , rough tube and 16fpi finned tube are worst . For FC-87 , Rohsenow correlation can well predict the heat transfer coefficient of plain tube in 45% agreement . Pin finned tube has the highest heat transfer coefficient and that the L-shaped finned tube have the next highest value , follow behind segmented finned and 16fpi finned tubes , mesh finned tube and rough tube perform worse .

摘 要
目 錄
圖 目 錄
表 目 錄
符 號 說 明
第一章 緒 論
1.1 研究背景與目的
1.2 文獻回顧
第二章 實 驗 系 統
2.1 工作流體性質
2.2 系統設計
2.3 數據擷取系統
2.4 輔助系統-真空幫浦
2.5 不準度
2.6 實驗方法
第三章 理論及實驗數據分析
3-1. 池沸騰熱傳理論分析
3-2. 實驗數據分析
第四章 實 驗 結 果 與 討 論
4-1. 實驗條件
4-2. 實驗結果及討論
第五章 結 論
附 錄 A
附 錄 B
參 考 文 獻

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