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研究生:莊維釗
論文名稱:45度斜角平行四邊形平滑壁面雙通道之流場與熱傳數值模擬
論文名稱(外文):Numerical Simulation of Fluid Flow and Heat Transfer in Two-Pass Smooth-Wall Parallelogram Channels with 45-deg Inclined Angle
指導教授:劉通敏劉通敏引用關係張始偉張始偉引用關係
學位類別:碩士
校院名稱:國立清華大學
系所名稱:動力機械工程學系
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:2014
畢業學年度:102
語文別:中文
論文頁數:120
中文關鍵詞:平行四邊形雙通道流場熱傳數值模擬
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本數值研究模擬45°斜角平行四邊形平滑壁面雙通道之穩態流場與溫度場,流場型態包含層流場與紊流場。數值方法為有限體積法,對流項的空間離散採用二階上風法,擴散項的空間離散採用中央差分法,並且使用耦合求解器求解。
層流場模擬定雷諾數(Re=350)與定熱通量之條件,比較平行四邊形(AR=1/1)與方形雙通道之流場結構與熱傳性能之差異,結果顯示平行四邊形雙通道之定流量平均紐森數((Nu) ̅)較方形雙通道之(Nu) ̅高8.6%,而其范寧摩擦因子(f)較方形雙通道之f值低59%,故在定泵功率條件下,平行四邊形雙通道之熱性能係數(TPF)較方形雙通道之TPF高48%,證明平行四邊形雙通道較方形雙通道具有較佳之熱傳性能。另外,分析通道邊長比(AR)對平行四邊形雙通道的流場結構與熱傳性能之影響。研究分析通道之邊長比包含:1/1、1/2、1/4、2/1和4/1。研究結果顯示AR=1/1和AR=2/1能提供較佳之熱傳性能。
平行四邊形(AR=1/1)雙通道於Re=10000之紊流場模擬分析,分別使用k-ε、k-ω及SST三種不同紊流模式進行模擬。模擬結果與實驗數據驗證,探討不同紊流模式對模擬結果之影響。結果發現,三種紊流模式中以SST較接近實驗結果,而k-ε則與實驗數據相差甚大。
摘要 I
誌謝 II
目錄 III
圖表目錄 VII
符號 XI
第一章 前言 1
1-1 研究動機 1
1-1-1 層流之應用 1
1-1-2 紊流之應用 2
1-2 文獻回顧 5
1-2-1 層流之文獻 5
1-2-2 紊流之文獻 6
1-3 文獻總結 10
1-4 研究目的 11
第二章 研究方法 13
2-1 統御方程式 13
2-2 紊流模式 15
2-2-1 k-ε紊流模式 15
2-2-2 k-ω紊流模式 16
2-2-3 SST紊流模式 17
2-2-4 近壁面之流場模擬 19
2-3 數值方法 22
2-4 數據處理 23
2-5 模擬結果驗證 25
第三章 模擬條件 28
3-1 層流場 28
3-1-1 45°斜角平行四邊形(AR=1/1)與方形平滑壁面雙通道流場及其熱傳性能之比較 28
3-1-2 通道邊長比(AR)對45°斜角平行四邊形平滑壁面雙通道流場及其熱傳性能之影響 31
3-2 紊流場 34
3-2-1 紊流模式對45°斜角平行四邊形(AR=1/1)平滑壁面雙通道流場及其熱傳性能之影響 34
第四章 結果與討論(1)-層流場 37
4-1 45°斜角平行四邊形(AR=1/1)與方形平滑壁面雙通道流場及其熱傳性能之比較 37
4-1-1 主流場 37
4-1-2 二次流流場 39
4-1-3 熱傳性能分析 40
4-1-4 流場與熱傳性能之關聯性分析 42
4-2 通道邊長比(AR)對45°斜角平行四邊形平滑壁面雙通道流場及其熱傳性能之影響 43
4-2-1 主流場 43
4-2-2 二次流流場 46
4-2-3 熱傳性能分析 47
4-2-4 流場與熱傳性能之關聯性分析 50
第五章 結果與討論(2)-紊流場 53
5-1 紊流模式對45°斜角平行四邊形(AR=1/1)平滑壁面雙通道流場及其熱傳性能之影響 53
5-1-1 主流場 53
5-1-2 二次流流場 55
5-1-3 熱傳性能分析 58
第六章 結論與未來建議 61
6-1 結論(1)-層流場 61
6-2 結論(2)-紊流場 62
6-3 未來建議 62
參考文獻 64
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