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博碩士論文 etd-0712114-162723 詳細資訊
Title page for etd-0712114-162723
論文名稱
Title
熱毛細流場在電漿環境下自由表面變形之影響
The effects of thermaocapillary flow under plasma condition on surface deformation during solidification
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
52
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
電漿環境、熱毛細力、等位函數、二相流、相場法、磁性流體力學
Thermocapillary, Level-set equation, Magnetohydrodynamics, phase-field method, Two-phase flow, plasma condition
統計
Statistics
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中文摘要
本研究採用相場法(Phase-field method)與磁性流體力學模組(Magnetohydrodynamics;MHD),將空氣置換為氬氣(Argon:Ar)之電漿,以二相流(Two-phase flow)模擬金屬表面在電漿環境下受出入口熱通量影響後,其鎔融或固化之暫態熱流行為。本研究考慮質量守恆方程式、動量方程式、能量方程式、等位函數、電場及磁場效應、黏滯力效應、以及離子電子動量交換之間的碰撞效應,求得模擬流場的溫度、壓力、流線與等位數之分佈。本篇研究探討在氬氣之電漿環境下,由不同的邊界條件預測製造加工與加工件固化後自由表面流體之變化,譬如固化、渦流、漣漪或湧起形成;此等反應會直接影響表面熱處理與焊接成品的品質。
Abstract
This study uses the phase-field method and Magnetohydrodynamics (MHD) method to simulate thermaocapillary flow under plasma (Ar plasma) condition on surface of a metallic material ,molten or solidified by the heat flux during process.This research cosider by mass conservation equation,momentum equation,energy equation, level-set equation, electric fields and magnetic fields,viscous and momentum exchange collisions between electrons and ions particles.This project is to explore under plasma condition, formed on the surface morphology after curing and processing parts, such as surfacefilled, depression, or the formation of ripple; These reaction will directly affect the surface heat treament and welding quality of the finished product.
目次 Table of Contents
誌謝 i
摘要 ii
英文摘要 iii
符號說明 iv
目錄 viii
圖次 ix
第一章 緒論 1
1.1 研究背景 1
1.2 二相流、相場法與磁性流體力學模擬方法簡介 1
1.3本論文研究內容簡介 3
1.4論文架構 4
第二章 理論分析與方法 5
2.1 模型統御方程式 5
2.1.1二相流-相場法模組 5
2.1.2磁性流體力學模組 13
2.2 模型區域設定 24
2.2.1 模型幾何、邊界與網格設定: 24
2.2.2 各流體性質設定: 28
2.3研究與模擬之流程圖 29
第三章 模擬結果與討論 30
3.1 模擬條件與說明 30
3.2 模擬結果 30
第四章 結論 37
參考文獻 38
參考文獻 References
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