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研究生:吳家瑞
研究生(外文):Jia-Ruei Wu
論文名稱:水平圓管與圓球表面上強制對流膜狀凝結之熵增分析
論文名稱(外文):Entropy Generation of Forced Convection Film Condensation from Downward Flowing Vapors onto a Horizontal Tube or Sphere
指導教授:楊勝安楊勝安引用關係
指導教授(外文):Sheng-An Yang
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:模具工程系碩士班
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:2007
畢業學年度:95
語文別:中文
論文頁數:110
中文關鍵詞: 熵 圓管 圓球 膜狀凝結 強制對流
外文關鍵詞:EntropyTubeSphereFilm condensationForced convection
相關次數:
  • 被引用被引用:1
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  • 收藏至我的研究室書目清單書目收藏:1
本論文利用熱力學第二定律研究強制對流下飽和蒸氣垂直流過水平圓管與圓球表面膜狀凝結熱傳問題。本研究結合Adrian Bejan學者所提出在對流熱傳下熵增原理與指導教授楊勝安教授之膜狀凝結熱傳研究方法,並以數值方法來解水平圓管與圓球表面膜狀凝結熱傳問題。本文在針對水平圓管與圓球在不同的邊界條件下:﹙1﹚表面定溫之穩態情況, ﹙2﹚表面溫度可變化之穩態情況,作強制對流膜狀凝結之熵值增加率分析。本文藉由分析無因次局部熵增率和無因次總熵增率結果,做一系列之討論。並由Reynold參數、Brinkman參數、不可逆率等相關無因次參數與壓力梯度影響,對水平圓管與圓球外之膜狀凝結熵增性質能有進一步的了解。結果顯示,當Reynold參數遞增時,無因次熱傳係數增加,然而也造成熵增率增加。熵增率隨Brinkman參數增加而變大。同時在不可逆率上,熱傳貢獻明顯大於流體摩擦的貢獻。在有壓力梯度影響,熵增率值較高,而局部熵增率之分佈會在分離角之前;最後,也可以達成分析均勻溫度及非均勻溫度下不同的熵增情形,以作為未來設計相關熱機系統的參考。
Based on the thermodynamic second law, this thesis studies the film-wise condensation heat transfer phenomenon from a mass of saturated vapor vertically flowing onto a horizontal circular tube and a spherical surface.
This research has combined the EGM technique (entropy generation minimization), proposed by Adrian Bejan, for the laminar flow with convection heat transfer situation and the heat transfer approach developed by my adviser, Dr. Yang for laminar film condensation, and therefore, via numerical methods, solved the film-wise condensation heat transfer problem related to a horizontal circular tube and a spherical surface. In the present paper, we have analyzed the entropy generation rate of force-convection film condensation around a horizontal circular tube and a sphere with variable boundary conditions, which includes (1) steady state with isothermal wall temperature, and (2) steady state with variable wall temperatures.
A series of discussions have been made through the analysis of both dimensionless local and total entropy generation rates. From examining the influence of pressure gradient and associated parameters, such as Reynold number and Brinkman number, we have also obtained further understanding of the entropy generation of the film condensation taking place around a horizontal circular tube and a sphere. According to the results of our research, the dimensionless heat transfer coefficient increases along with the ascending Reynold number which, however, also causes the rising of entropy generation rate. When the Brinkman number grows, the entropy generation rate becomes bigger. Meanwhile, in terms of the irreversibility, the heat transfer effect obviously dominates over the contribution of flow friction.
Under the influence of pressure gradient, the entropy generation rate becomes bigger, and the local entropy generation rate also distributes before the separation angle. Besides, the analysis of entropy generation for the cases of uniform and non-uniform temperatures can also be a good future reference for designing thermal-mechanical systems.
目錄
中文摘要 I
英文摘要 II
誌謝 IV
目錄 V
圖目錄 VII
符號說明 VIII
第一章 緒論 1
1-1 凝結物理模式 1
1-2 熵 3
1-3 文獻回顧 4
1-4 研究動機 8
1-5 論文架構 8
第二章 熵增定律理論分析 13
2-1 對流熱傳之局部熵增變化 13
2-2 流動摩擦不可逆率與熱傳不可逆率 15
第三章 等溫水平圓管與圓球表面強制對流薄膜凝結熱傳熵增定律分析 18
3-1 等溫水平圓管表面強制對流薄膜凝結熱傳熵增定律分析 18
3-1-1 局部熵增方程式之建立與求解 18
3-1-2 總體熵增方程式之建立與求解 25
3-2 等溫圓球表面強制對流薄膜凝結熱傳熵增定律分析 27
3-2-1 局部熵增方程式之建立與求解 27
3-2-2 總體熵增方程式之建立與求解 33
3-3 結果與討論 37
3-3-1 等溫水平圓管表面強制對流膜狀凝結之局部與總體熵增變化 37
3-3-2 等溫圓球表面強制對流膜狀凝結之局部與總體熵增變化 39
3-3-3 壓力梯度對等溫水平圓管與圓球表面強制對流膜狀凝結之局部與總體熵增變化 41
第四章 變溫水平圓管與圓球表面強制對流薄膜凝結熱傳熵增定律分析 54
4-1 變溫水平圓管表面強制對流薄膜凝結熱傳熵增定律分析 54
4-1-1 局部熵增方程式之建立與求解 54
4-1-2 總體熵增方程式之建立與求解 61
4-2 變溫圓球表面強制對流薄膜凝結熱傳熵增定律分析 63
4-2-1 局部熵增方程式之建立與求解 63
4-2-2 總體熵增方程式之建立與求解 70
4-3 結果與討論 72
4-3-1 變溫水平圓管表面強制對流膜狀凝結之局部與總體熵增變化 72
4-3-2 變溫圓球表面強制對流膜狀凝結之局部與總體熵增變化 73
4-3-3 等溫與變溫水平圓管和圓球表面強制對流膜狀凝結之總體熵增變化 75
第五章 結論 86
5-1綜合討論 86
5-2未來研究方向與建議 88
參考文獻 89
簡歷 94
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