臺灣博碩士論文加值系統

本文以Fluent套裝軟體來模擬分析流體在方形封閉容器內裝置分隔板之混合對流熱傳問題。在二維的方形容器內，左壁面為移動熱壁面，右壁面為冷壁面，上下壁面均為絕熱壁面，運用CFD數值模擬解析方式，模擬封閉容器內裝置不同間距分隔板之溫度、流場之情況。
本研究探討流場運動中雷諾數對於渦漩結構變化之影響，對於空穴流場內移動所產生的循環現象，此流場之渦漩結構會隨著流場雷諾數的增加而有所變化。除此之外，改變分隔板方向和分隔板之間的間距也可以很明顯地影響流線和熱現象。一般由研究結果顯示分隔板之間的間距增加，紐塞數的值也會隨之增加，而分隔板的方向對紐塞數的值幾乎沒有什麼影響。

Mixed convection heat transfer in a square confined enclosure with partition plates is simulated in this study. The cavity is constructed with two adiabatic horizontal walls and two isothermal walls at different temperatures. The CFD scheme is applied to analyze the flow fields in the cavity. This study analyzes the effect configuration of the partition plates in the cavity on the thermal and flow fields.
The results of this study reveal that raising of the Reynolds number will increase the strength of the circulation inside the cavity. In addition, changing the orientation and the distance between the plates also affect the streamlines and the thermal phenomenon significantly. In general, increasing the distance between the plates results in an increase on the values of the Nusselt number. The orientation of the plates has little effect on the values of the Nusselt number.

摘要 I
Abstract II
致謝 III
總目錄 IV
圖目錄 V
符號說明 VII
希臘字母 IX
第一章 緒論 1
1-1 研究動機與目的 1
1-1-1 研究動機 1
1-1-2 研究目的 2
1-2 文獻回顧 3
第二章 理論分析 6
2-1 物理模型與基本假設 6
2-2 統御方程式 8
2-3 對流模擬邊界設定及網格建立 11
2-4 壓力與速度耦合方程式 12
2-5 數值模擬軟體簡介 13
2-6 CFD 分析步驟 15
2-7 網格結構 17
2-8 結構化網格 17
2-9 非結構化網格 18
第三章 軟體驗證 20
3-1 二維自然對流分析驗證 21
3-1-1 自然對流題型 21
3-1-2 浮力效應的影響 21
3-1-3 二維方形分析結果 23
3-2 方形封閉容器網格比較結果 23
第四章 結果與討論 31
4-1 數值模擬解析結果 31
4-1-1 數值模擬分析結果與討論 31
4-1-2 數值模擬分析結果 35
第五章 結論與建議 61
5-1 結論 61
5-2 對未來研究之建議 62
參考文獻 63

1.H.F. Oztop,Zepu Zhao and Bo Yu,2009, “Fluid flow due to combined convection in lid-driven enclosure having a circular body”,Int. J. Heat Fluid Flow, vol.30,pp.886-901.
2.Y. Varol, H.F. Oztop and A. Koca, 2008, “Entropy generation due to conjugate natural convection in enclosures bounded by vertical solid walls with different thicknesses”, Int. Comm. Heat Mass Transfer, Vol.35 , pp. 648–656.
3.H.F. Oztop and I. Dagtekin,2004, “Mixed convection in two-sided lid-driven differentially heated square cavity”, Int. J. Heat Mass Transfer, Vol.47, pp. 1761–1769.
4.F. Bauman, A. Gadgil and R. Greif,1980, “Buoyancy-driven convection in enclosures: Experimental results and numerical calculation” , ASME paper 80-HT-66 .
5.M.K. Moallemi and K.S. Jang,1992, “Prandtl number effects on laminar mixed convection heat transfer in a lid-driven cavity”, Int. J. Heat Mass Transfer, vol. 35, pp. 1881–1892.
6.H A.A. Mohamad and R. Viskanta,1995, “Flow and heat transfer in a lid-driven cavity with stably stratified fluid” , Appl. Math. Model vol.19, pp. 465–472.
7.A.K. Prasad and J.R. Koseff,1996, “Combined forced and natural convection heat transfer in a deep lid-driven cavity flow”, Int. J. Heat Fluid Flow, vol.17, pp. 460–467.
8.K.M. Khanafer and A.J. Chamkha,1999, “Mixed convection flow in a lid-driven enclosure with a fluid-saturated porous medium”, Int. J. Heat Mass Transfer, vol.19, pp. 2465–2481.
9.E.Bilgen,2002,“Natural convection in enclosures with partial partitions”, Renewable Energy, Vol. 26, pp. 257-270.
10.S. H. Tasnim and M. R. Collins,2004, “Numerical analysis of heat transfer in a square cavity with a baffle on the hot wall”, Int. Comm. Heat Mass Transfer , vol 31, pp.639－650 .
11.X. Shi and J.M. Khodadadi,2005, “Periodic state of fluid flow and heat transfer in a lid-driven cavity due to an oscillating thin fin”, Int. J. Heat Mass Transfer, vol.48, pp. 5323–5337.
12.R. Iwatsu, J.M. Hyun and K. Kuwahara,1993, “Mixed convection in a driven cavity with a stable vertical temperature gradient”, Int. J. Heat Mass Transfer, vol.36, pp. 1601–1608.
13.R. Iwatsu and J.M. Hyun,1995, “Three-dimensional driven-cavity flows with a vertical temperature gradient”, Int. J. Heat Mass Transfer, vol.38, pp. 3319–3328.
14.A. Bar-cohen and W. M. Rohsenow,1984, “Thermally Optimum Spacing of Vertical, Natural-Convection Cooled, Parallel Plates”, Journal of Heat Transfer-Transactions of the ASME, vol. 106, pp. 116-123.
15.G. Ledezma and A. Bejan, “Heat sinks with sloped plate fins in natural and forced convection”, International Journal of Heat and Mass Transfer, vol. 39, pp. 1773-1783, Jun 1996.
16.Airpak, FIDAP, FLUENT, GAMBIT, Icepak, MixSim, and POLYFLOW are registered trademarks of Fluent Inc. Lebanon,NH03766, 2003.
17.周華、孫為民、徐麗、宋劍，2005，Fluent全攻略。
18.呂振益，2009，雙層通氣浪板建構屋頂散熱之研究，國立高雄應用科技大學機械與精密工程研究所碩士論文。
19.王瑞金，張凱，王剛，2007.2，Fluent應用基礎與應用實例，北京 清華大學出版社(CAD/CAM/CAE應用技術)，ISBN 978-7-302-14590-5.
20.FLUENT 6.3 User's Guide, Fluent Inc, 2006.
21.余元利，“熱壁上有分隔板的正方形空間內低溫水自然對流熱傳之探討”，中國機械工程學會第二十三屆學術研討會論文集，頁A8-70，台南，崑山科技大學，Nov. 24-25, 2006。
22.王彰健，2004，封閉腔體內之高溫差自然對流研究，國立成功大學航空太空工程研究所碩士論文。
23.詹惟淳，2007，封閉矩形室流場及熱傳數值模擬分析，國立成功大學航空太空工程研究所碩士論文。