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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 |
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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 |
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 |
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統計 Statistics |
本論文已被瀏覽 5667 次,被下載 0 次 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 |
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