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研究生:楊書杰
研究生(外文):Shu-Chieh Yang
論文名稱:等面積下橢圓球表面膜狀凝結熱傳之熵增分析
論文名稱(外文):Entropy Generation Analysis of Laminar Film Condensation on Vertical Ellipsoids Under Constant Area surface
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
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:2009
畢業學年度:97
語文別:中文
論文頁數:45
中文關鍵詞:橢圓球膜狀凝結熱力學第二定律熵增
外文關鍵詞:Film condensationThermodynamic second lawEllipsoidFilm condensationThermodynamic second lawEllipsoid
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本研究旨在應用熱力學第二定律,探討不同離心率的橢圓球在等面積的條件之下,有飽和蒸氣以極小速度,通過一等溫的外層流膜狀凝結層熱傳現象。也探討在可變璧溫的外層流膜狀凝結熱傳現象。以數值解析法研究其熵增率,其中引用Adrian Bejan的熵增分析法,並加入無因次參數包括Brinkman參數、Jakob參數、以及Rayleigh參數。本研究的結果顯示在等面積,橢圓球的離心率與其熵增成正比。換言之,垂直平板(離心率為1)的熵增率為最高,而圓球(離心率為零)的熵增率為最低。
The paper aims to apply the thermodynamics second law to investigate the laminar film condensation heat transfer from the vapor flowing slowly onto various vertical ellipsoids under constant surface area, including under variable wall temperatures. The numerical approach to the entropy generation, based on Adrian Bejan`s entropy generation minimization, is conducted in terms of Brinkman; Jakob, and Rayleigh parameters . The result indicates that the total entropy generation rate is proportional to the ellipticity of the vertical ellipsoid under constant surface area. In other words, the vertical flat plate, the limit case with ellipticity, e=1, generates the highest entropy, and the sphere, the other limit case with ellipticity, e=0, generates the lowest entropy
摘 要 I
ABSTRACT II
致謝 III
目 錄 IV
圖目錄 V
表目錄 VI
符 號 說 明 VII
第一章 緒論 1
1-1 熱力學發展與熱力學基本定律 1
1-2凝結的物理現象 3
1-3自然對流與薄膜凝結文獻回顧 4
1-4 研究動機 7
1-5 論文架構 7
第二章 橢圓球座標系建立 8
2-1 橢圓球座標系建立與推導 8
2-2 等面積橢圓球的建立 10
2-3 橢圓球表面張力座標系建立與推導 12
第三章 等溫橢圓球表面層流薄膜凝結熱傳熵增分析研究 13
3-1局部熵增方程式之建立與求解 13
3-2 平均熵增方程式之建立與求解 17
3-3 結果與討論 19
第四章 可變溫壁圓球外薄膜凝結熱傳熵增研究 23
4-1 變溫球壁局部熵增方程式之建立與求解 23
4-2 變溫球壁平均熵增方程式之建立與求解 27
4-3 結果與討論 28
第五章 結論 39
5-1綜合討論 39
5-2未來研究方向與建議 41
參考文獻 42
簡歷 45
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