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博碩士論文 etd-0712114-161220 詳細資訊
Title page for etd-0712114-161220
論文名稱
Title
高能量束鑽孔其鎖孔之形成機制
Mechanisms of keyhole formation during high intensity beam drilling
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
49
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2014-07-24
繳交日期
Date of Submission
2014-08-12
關鍵字
Keywords
質量方程式、相位場法、二相流、熱毛細力、動量方程式、等位函數、鎖孔、能量方程式
mass conservation equation, keyhole, Two-phase flow, Phase-field method, thermocapillary, Level-set function, energy equation, momentum equation
統計
Statistics
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The thesis/dissertation has been browsed 5667 times, has been downloaded 0 times.
中文摘要
本研究係以能量集中打在金屬上,使得金屬表面受一集中熱源加熱達到熔融狀態,並向下產生鎖孔的暫態熱流行為。
此研究為二為暫態模型,使用二相流(two phase flow)之相位場法(phase-field method)來模擬金屬表面。在研究中考量了質量方程式、動量方程式、能量方程式,以及等位函數,不考慮因濃度擴散造成的影響。最後可以得到溫度變化產生熱毛細力造成之熔區流動,以及向下鑽孔之現象。
Abstract
This study focuses on transient heat flow behavior in which centralizing energy on the metal makes metal surface come to a heat molten state and produce a keyhole with centralized heat source. This flow field is based on two-dimensional transient model, using Phase-field method and Two-phase flow to simulate metal surface. This study is under considerations of the mass conservation equation, momentum equation, energy equation and the level-set function, regardless of the impact due to the concentration diffusion. At last it will show the flow of the molten zone caused by temperature, the phenomenon of drilling a keyhole, and the flows in molten zone forced by thermocapillary which is caused by variation of temperature.
目次 Table of Contents
論文審定書 i
謝誌 ii
中文摘要 iii
Abstract iv
目錄 v
符號說明 vii
圖目錄 x
第一章 緒論 1
1.1 文獻回顧 1
1.2 研究目的 1
1.3 論文簡介 2
1.4 相位場法 (phase-field method) 2
第二章 數學模型之假設與統御方程式 4
2.1 基本假設與物理模型 4
(2.1-1) 基本假設 4
(2.1-2)物理模型 5
2.2 數學模型與統御方程式 5
(2.2-1) 等位函數 5
(2.2-2) 連續方程式 7
(2.2-3) 動量方程式 7
(2.2-4) 能量方程式 10
2.3 模型架構與邊界條件 10
(2.3-1) 模型架構 10
(2.3-2) 網格設定 11
(2.3-3) 邊界條件和初始值設定 13
第三章 模擬結果與討論 15
3.1 模擬條件 15
(3.1-1) 各種基本性質 15
(3.1-2) 基本性質的模擬圖 16
(3.1-3) 模擬說明 18
3.2 結果討論 32
第四章 結論與未來展望 34
4.1結論 34
4.2未來展望 34
参考文獻 35
參考文獻 References
[1] C.Lampa, A.F.H.Kaplan, J.Powell, and C. Magnusson,1977, “An analytical thermodynamic model of laser welding“, Journal of Physics D: Applied Physics 30,pp.1293-1299
[2] K. Ishizaki, N. Araki, and H. Murai, 1965, “Penetration in Arc Welding and Convection in Molten Metal”, J. Japan Welding Society, Vol. 34, pp.146-153.
[3] E. Friedman, 1978, “Analysis of Weld Puddle Distortion and its Effect on Penetration“, J. Welding, Vol.57, pp.161-s-166-s.
[4] C. R. Heiple and J. R. Roper, 1982, “Mechanism for Minor Element Effect on GTA Fusion Zone Geometry”, J. Welding, Vol.61, pp.97-s-102-s
[5] S. Kuo and Y. H. Wang, 1986, “Weld pool Convection and Its Effect”, J. Welding, Vol.65, pp.63-s-70-s.
[6] A. Paul and T. Debroy, 1988, “Free Surface Flow and Heat Transfer in Conduction Mode Laser Welding”, Metal. Trans. Vol.19B, pp.851-858.
[7] C. Chan, J. Mazumder and M. M. Chan, 1984, ”A Two-Dimension Transient Modle for Convection in Laser Melted Pool”, Metal. Trans., Vol.15A, pp.2175-2184.
[8] Pengtao Yue and James J. Feng, 2004, “A diffuse-interface method for simulating two-phase flows of complex fluids”, J. Fluid Mech, Vol 515, pp. 293-317
[9]Heike Emmerich,2003,The diffuse interface approach in materials science,Springer-Verlag. New York
[10] Nele Moelans, Bart Blanpain, Patrick Wollants,2008, “An introduction to phase-field modeling of microstructure evolution”,Computer Coupling of Phase Diagrams and Thermochemistry 32pp.269-270.
[11] Pengtao Yue and James J. Feng, 2004, “A diffuse-interface method for simulating two-phase flows of complex fluids”, J. Fluid Mech, Vol 515, pp. 293-317
[12] F. Kong, H. Zhang and G. Wang, 2008, “Numerical Simulation of Transient Multiphase Field during Hybrid Plasma-Laser Deposition Manufacturing”, J. Heat Transfer, Vol.130, NO.112101, 1-7.
[13] Y. Sun, C. Beckermann, 2006“, Sharp interface tracking using the phase-field equation”, Journal of Computational Physics 220 (2007) 626–653
[14] comsol1998–2008, “Chemical Engineering MODULE”,B O I L I N G WA T E R ,155-156
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