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系統識別號 U0026-1708201020201000
論文名稱(中文) 浮力對T型管微混合器混合效率之影響
論文名稱(英文) The Effects of Buoyancy on The Mixing Efficiency of T-tube Micromixers
校院名稱 成功大學
系所名稱(中) 航空太空工程學系碩博士班
系所名稱(英) Department of Aeronautics & Astronautics
學年度 98
學期 2
出版年 99
研究生(中文) 郭勝欣
研究生(英文) Sheng-Hsin Kuo
學號 p4697141
學位類別 碩士
語文別 中文
論文頁數 95頁
口試委員 指導教授-潘大知
口試委員-宛同
口試委員-牛仰堯
中文關鍵字 T型管微混合器  浮力  自然對流  葛拉秀浮數(Gr)  混合效率 
英文關鍵字 T-tube Micromixer  Buoyancy  Natural Convection  Grashof Number  Mixing Efficiency 
學科別分類
中文摘要 本次研究以計算流體力學為工具,在三維T型管微混合器中利用冷牆和熱牆的溫度差所產生的自然對流,來探討浮力對混合效率的影響。研究結果顯示,在T型管主流道中,因浮力而產生的漩渦其會隨冷熱牆的溫度差增加而增強,而此漩渦在待混合流體間之接觸面有拉伸捲曲的作用,因此接觸面面積變大有助於混合效率增加。同時漩渦的渦度越強,表示T型管截面上的速度分量越大,截面上待混合流體間的對流現象越旺盛,也有助於混合效率的提升。
英文摘要 The effect of buoyancy on the mixing efficiency of a T-tube micromixer is studied in this work using computational fluid dynamics. Natural convection generated by the temperature difference between the cold side wall and the hot side wall of the T-tube main channel will induce a vortex whose core is roughly in parallel to the main channel axis. This vortex generates cross-sectional velocity components which are advantageous to the mixing efficiency in two aspects. First, the mixing interface will be stretched and elongated by the cross-sectional velocity, and consequently the mixing interface area will be increased. Second, the cross-sectional velocity components will cause convective flows in the direction normal to the mixing interface, which increases the mixing efficiency.
論文目次 中文摘要...........................................I
英文摘要...........................................I
謝誌.............................................III
目錄...............................................V
表目錄...........................................VIII
圖目錄.............................................IX
符號說明...........................................XXI


第一章 緒論..........................................1
1-1 研究背景.........................................1
1-2 微混合器分類.....................................4
1-3 主動式微混合器....................................6
1-3-1 壓力擾動式(I)...................................6
1-3-2 壓力擾動式(II)..................................7
1-3-3 順序交換式......................................7
1-3-4 電解擾動式......................................8
1-3-5 自然對流式微混合器...............................9
1-3-6 氣泡式幫浦微混合器..............................11
1-4 被動式微混合器...................................12
1-4-1 層疊式微混合器(Lamination Micromixer) .........12
1-4-2 注射式微混合器.................................13
1-4-3 二次流現象(Second Flow)微混合器.................14
1-4-4 分離現象(Separation)微混合器....................15
1-4-5 分子擴散作用(Molecular Diffusion)微混合器(I) ....16
1-4-6 分子擴散作用(Molecular Diffusion)微混合器(II)....17
1-4-7 混沌對流(Chaotic Advection)微混合器.............18
1-5 研究概念.........................................19

第二章 統御方程式和數值方法............................20
2-1 基本假設........................................20
2-2 統御方程式......................................21
2-3 CFD 模擬工具....................................23
2-4 邊界條件設定....................................23
2-5 重要參數.......................................24

第三章 二維T型管微混合器之數值分析....................28
3-1 T型管微混合器..................................28
3-2 一維擴散原理驗證...............................32
3-3 自然對流對於正方形空穴之驗證.................... 44

第四章 浮力對T型管混合器之影響........................51
4-1 定義完全混合長度 ..............................51
4-2 浮力型T型管微混合器之設計........................52
4-3 以水為工作流體之基本浮力型T型管微混合器............53
4-4 以酒精為工作流體之基本浮力型T型管微混合器..........64
4-5 以甲醇為工作流體之基本浮力型T型管微混合器...........75
4-6 不同工作流體浮力效應比較..........................86
4-7 底部加熱之T型管微混合器...........................87
4-8 冷熱牆縮短之浮力型T型管微混合器....................90

第五章 結論..........................................92

參考文獻............................................94
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