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論文名稱 Title |
機械加工之馬里哥尼角落流 Marangoni Corner Flow during Metals Processing |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
49 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2003-06-27 |
繳交日期 Date of Submission |
2003-07-29 |
關鍵字 Keywords |
熱傳、數值分析、馬里哥尼、熱流、機械 numerical simulation, Marangoni, thermocapillary |
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統計 Statistics |
本論文已被瀏覽 5691 次,被下載 1878 次 The thesis/dissertation has been browsed 5691 times, has been downloaded 1878 times. |
中文摘要 |
摘 要 以數值方法去探討傾斜的圍場內,關於熱毛細力在靠近角落區域的穩態對流現象。介紹固定的轉換式,在液態裡解質量、動量、能量方程式,而在固態區解能量方程式,去預測自由表面遭受入射能量影響所造成的形狀,結果提供了固體液體的介面所引起的波紋、邊緣凹陷、氣動等等缺陷分析,有了更進一步的看法。 |
Abstract |
Abstract The steady thermocapillary motion in shallow enclosures is studied. Two different configurations, imposed heat flux and differentially heated side walls, are considered. A numerical simulation of the problem in the imposed heat flux case is made. The Pressure Correction Method is used to treat the pressure velocity coupling, in particular, the SIMPLER approximation. The discretization is made using central differences along with an appropriate non-uniform grid. |
目次 Table of Contents |
目 次 謝誌…………………………………………………………………a 摘要………………………………………………………………..b 目錄…………………………………………………………………c 圖目錄………………………………………………………………e 第一章 序論 1.1 研究動機及目的……………………………………….. 1 1.2 文獻回顧……………………………………………….. 2 第二章 方程式及推導 2.1 Nomenclature…………………………………………. 5 2.2 方程式………………………………………………… 7 2.2-1 統御方程式…………………………………………... 9 2.2-2 無因次化……………………………………………... 9 2.2-3 有限差分法(final difference)……………………...10 2.3 邊界條件……………………………………………...22 第三章 實驗目的、設備及方法…………………………………25 第四章 結果與討論………………………………………………27 第五章 結論………………………………………………………32 參考文獻……………………………………………………………33 圖…………………………………………………………………. 36 附錄一 1. 座標轉換…………………………………………………. 43 2. 傅利葉半幅展開………………………………………… 44 3. 統御方程式之無因次化過程…………………………… 45 4. Boundary conditions的無因次化過程…………………. 47 圖.1 物理domain ……………………………………………… 36 圖.2 計算domain ……………………………………………… 37 圖.3 計算domain網格圖 ……………………………………… 38 圖.4 物理domain網格圖 ……………………………………… 39 圖.5 本研究與RIVAS和OATRACH數值計算 結果相比對(a)表面速度(b)表面溫度 ………………… 40 圖.6 Ma=250 Pr=0.01 Ca=4 x10 H=0.2 流場分布圖 … 41 圖.7 Ma=-250 Pr=0.01 Ca=-4 x10 H=0.02 流場分布圖 42 |
參考文獻 References |
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A., 1974,"Movement of Molten Metal during Electron-Beam Welding," Svarochnoe Proizvodstvo, Voi.21, pp.12-14. Oreper, G. M., and Szekely, J., 1984, "Heat and Fluid Flow Phenomena in Weld Pools," J. Fluid Mechanics, Vo1.147, pp.53-79. Ostrach, S., 1982,"low-Gravity Fluid Flows," Annual Reviews of Fluid Mechanics, Vo1.14. pp.313-345. Ostrach, S., 1983,"Fluid Mechanics in Crystal Growth-The 1982 Freeman Scholar Lecture," ASME J. Fluid EnRineering, Vo1.105, pp.5-20. Paul, A., and DebRoy, T., 1988, "Free Surface Flow and Heat Transfer in Conduction Mode Laser Welding," Metallurgical Transactions B, Vol. 19B, pp.851-858. Pearson, J. R. A., 1958,"0n Convection Cells Induced by Surface Tension," J. Fluid Mechanics, Vo1.4, pp.489-500. Rivas, D., and Ostrach, S., 1989, "Low-Prandtl-Number Thermocapillary Flows in Shallow Enclosures," PCH PhysicoChemical Hydrodynamics, Vol. 11, pp. 765-783. 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Heat Transfer, Vol. 1 18, pp. 960-969. Wei, P. S., and Chiou, L. R., 1988, "Molten Metal Flow Around the Base of a Cavity During a High-Energy Beam Penetrating Process," ASME J. of Heat Transfer, Vol. I 10, pp.9 1 8-923. Zacharia, T., David, S. A., Vitek, J. M., and DebRoy, T., 1989, "Weld Pool Development during GTA and Laser Beam Welding of Type 304 Stainless Steel, Part I-Theoretical Analysis,"Welding J., Vo1.68, pp.499-s to 509-s. Zebib, A., Homsy, G. M., and Meiburg, E., 1985,"High Marangoni Number Convection in a Square Cavity," Physics of'Fluids, Vo1.28, pp.3467-3476. Zehr, R., Chen, M. M., and Mazumder, J., 1988, "Generic Structure of Thermocapillary Flow in Weld Pools and Its Influence on Computational Strategy," Modeling and Control of Casting and Welding Processes IV, edited by A. F. Giamei and G. J. Abbaschian, Palm Coast, Florida, April 17-22, 1988, The Minerals, Metals & Materials Society, pp. 433-446. |
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