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研究生: 石明翰
Shih, Ming-Han
論文名稱: 傾斜雙層玻璃之自然對流的實驗與數值研究
Numerical and Experimental Study of Natural Convection for Inclined Double-Glasses
指導教授: 陳寒濤
Chen, Han-Taw
學位類別: 碩士
Master
系所名稱: 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年: 2015
畢業學年度: 103
語文別: 中文
論文頁數: 102
中文關鍵詞: 逆算法雙層玻璃自然對流開孔
外文關鍵詞: inverse problem, double-glasses, natural convection, open cavity
相關次數: 點閱:87下載:4
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  • 本文以數值逆算法及商業計算流體力學軟體配合實驗量測數據
    溫度來研究雙層玻璃內部空間之流場與溫度分佈情形。在不同傾斜
    角度與開孔模式時,研究其溫度與流場分布受到之影響並加以探
    討。為了驗證本文逆算法之精確性,將先以本文所求得之逆算結果
    與文獻結果比較之後,再利用商業軟體配合逆算結果及實驗數據來
    求得不同時間之玻璃內部空間空氣流場與溫度分佈情形。由於雷利
    數皆小於密閉空間產生紊流之標準,故層流模式被引入本文進行模
    擬。
    此外,亦針對外部壁面在不同角度下使用不同紐賽爾數經驗公
    式所得出之熱對流係數,與實驗結果進行比較,發現數種情況中經
    驗公式與結果有著落差,但仍在一定範圍中。從模擬得出穩態與暫
    態之結果,可發現其傾斜角度對於內部隔熱效果不如開孔來的有
    效,然此開孔效果不如預期中之有效,故在開孔模式與其對流影響
    仍須更進一步的研究。

    This study use the inverse method and CFD software with the experimental data to
    research the flow structure and temperature distribution in the cavity of double glass.
    In the different case with various inclined angle and open cavity configuration,
    obtaining the change of flow structure and temperature distribution and discuss it. In
    order to verify the reliability of the inverse method in present study, the present study
    will compare results of inverse method with reference [8], using the CFD software with
    results of inverse method and experimental data to simulate the flow structure and
    temperature distribution in the cavity of double glass. Due to Rayleigh number is lower
    than criteria of turbulent in the cavity, the laminar mode will used in the simulation in
    the present study. Besides, the outside wall heat transfer coefficients obtained by
    different Nusselt number correlation in various inclined angle are compared with
    experimental results. In the some case the result of correlation have a little gap to the
    experimental results, however, still in the moderate range. From the simulation results
    of steady and transient, the present study find that the open cavity configuration are
    more important of convection in the cavity of double glass than changing inclined
    angle. However, the influence by open cavity configuration are not as good as
    expected. Therefore, it still need much further research in this problem.

    目錄 摘要 ....... I 致謝 ....... V 目錄 ...... VI 表目錄 ...... VIII 圖目錄 ....... X 符號說明 ....... XIV 第一章 緒論 ...... 1 1-1 研究背景 ........... 1 1-2 文獻回顧 ........... 3 1-3 研究目的 ........... 8 1-4 研究重點與架構 ......... 9 第二章 逆算法分析 ..... 12 2-1 數學模式 ......... 12 2-2 一維模式 ......... 13 2-3 二維模式 ......... 19 2-4 分析熱對流係數 ......... 23 2-5 可靠度之驗證 ......... 25 VII 第三章 實驗操作與數據分析 ..... 33 3-1 簡介 ........... 33 3-2 實驗設備 ......... 34 3-3 實驗步驟 ......... 36 3-4 實驗結果與數值分析 ........ 37 第四章 數值模擬分析 .... 46 4-1 簡介 ........... 46 4-2 統御方程式 ......... 46 4-3 邊界條件 ......... 48 4-4 軟體設定 ......... 49 4-5 模擬結果分析 ......... 50 4-5-1 穩態分析 ......... 50 4-5-1 暫態分析 ......... 51 第五章 結果討論與未來展望 ..... 91 5-1 結果討論 ......... 91 5-2 未來展望 ......... 93 參考文獻 ...... 99

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