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研究生:王麗婷
研究生(外文):Li-Ting Wang
論文名稱:傾斜板在多孔質中結合熱傳與質傳之自然對流
指導教授:林孝宗林孝宗引用關係周正堂周正堂引用關係鄭文桐
學位類別:碩士
校院名稱:國立中央大學
系所名稱:化學工程與材料工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:109
中文關鍵詞:多孔質自然對流傾斜板
相關次數:
  • 被引用被引用:1
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本論文主要探討傾斜板在多孔質中結合線熱源熱傳與等質通量壁質傳之自然對流系統。首先利用溫度與濃度邊界層之量階分析的結果,定義符合傾斜板自然對流系統的無因次轉換參數和變數。然後將系統的統制方程式轉換成比較容易進行數值解的無因次方程式組。並應用具無條件穩定及高效率的數值方法進行求解。所得的數值結果,可完整描述由垂直板到水平板自然對流的數值結果。
路易士數選取的範圍包括低路易士數(0.3至3.0)與高路易士數(20至200)兩種系統。前者適用於空氣中的微量氣體與一些常見的碳氫化合物;後者適用於稀薄的水溶液。
將所求得的數值解,經由適當轉換後,以更具有明顯物理意義的方式作圖,以顯示此系統的速度、溫度、濃度之分佈情形。此外,重要的物理量(如壁面溫度及薛伍德數)與浮力比參數、傾斜參數以及路易士數之關係,亦可由圖中加以觀察比較。
由圖示的結果可發現,路易士數對質傳的影響比熱傳大。且高路易士數的系統對質傳速率的影響比低路易士數的系統更顯著。
目錄
目 錄Ⅰ
圖 目 錄Ⅲ
表 目 錄Ⅴ
符 號 說 明Ⅵ
第一章 緒論1
1.1 研究動機及目的1
1.2 多孔質的流動方式1
1.3 多孔質中的熱傳對流系統之文獻回顧2
1.4 多孔質中結合熱傳與質傳的自然對流之文獻回顧3
1.5 多孔質中壁煙流之文獻回顧4
1.6 傾斜板自然對流之文獻回顧5
1.7 本文研究的方法6
1.8 本論文之架構7
第二章 理論解析與數值方法8
2.1 系統描述8
2.2 基本假設10
2.3 數學模式11
2.4 以系統整合方法做無因次變數轉換14
2.5 無因次統制方程式18
2.6 幾種特例之無因次統制方程式20
2.7 重要物理量22
2.8 數值方法簡介23
第三章 結果與討論25
3.1 速度分佈25
3.2 溫度分佈27
3.3 濃度分佈29
3.4 壁面溫度分佈31
3.5 質量傳送係數33
第四章 結論100
參考文獻102
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