| 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 |
| 分享至: |
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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.
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