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研究生:陳德翰
研究生(外文):De-han Chen
論文名稱:具彎曲流道之微混合器中非牛頓流體的混合
論文名稱(外文):Mixing behavior of non-Newtonian fluids in micromixers with curved channel
指導教授:吳志陽
指導教授(外文):C.Y.Wu
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:88
中文關鍵詞:微混合器非牛頓流體雷諾數深寬比
外文關鍵詞:non-Newtonian fluidsaspect ratioRenolds numbermicromixer
相關次數:
  • 被引用被引用:2
  • 點閱點閱:129
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  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
本研究探討非牛頓流體在弧型流道中的混合現象,使用之非牛頓流體為含微量玫瑰紅螢光劑及不含玫瑰紅螢光劑之羧甲基纖維素水溶液,並使用冪次法則去描述非牛頓流體的剪應力和剪應變率的非線性關係;而弧形流道的形狀包括了弧形、S形及連續彎曲的流道。本研究利用數值模擬及實驗來探討流量、主流道截面深寬比、主流道彎曲之半徑及非牛頓水溶液之濃度對於混合效率的影響。其中,實驗過程包含:利用光微影技術製作母模、使用PDMS翻模,並將PDMS與載玻片接合成流道,再使用共軛焦顯微鏡取得流道內螢光溶液之流動及濃度分布的影像,及使用數值軟體CFD-ACE+模擬在微混合器中的三維流動及擴散現象,結果顯示數值模擬與實驗之結果相當一致,並得知在以下條件中微混合器有較佳的混合效率:(1)雷諾數越高;(2)非牛頓流體的濃度越高;(3)主流道截面深寬比越大;(4)主流道彎曲半徑越小。
Mixing of non-Newtonian fluids in curved channels is investigated in this work. The non-Newtonian fluids considered are the aqueous solutions of Carboxymethyl Cellulose Sodium with Rhodamine B and without Rhodamine B. The relation between shear stress and shear strain rate of the non-Newtonian fluids is modeled by a power law. The shapes of the curved channels include arcs, S-shaped channels and a combination of many S-shaped channel. The effects of the flow rate, the concentration of non-Newtonian fluid, and the aspect ratio and the curved radius of main channel on mixing efficiency are examined by numerical simulation and experiment. The fabrication process of the micromixers includes applying the photolithography method to fabricate SU-8 mold, replicating the mold by PDMS (polydimethysiloxane) and bonding the former with a sheet of cover glass. The fluid flow and mixing is observed by a confocal spectral microscope, Leica TCS SP2. Besides, we apply the commercial package, CFD-ACE+, to simulate the three-dimensional flow and mixing in the micromixer. Agreement of simulation and experiment results is found for the case considered. The results of this research show that the mixing efficiency can be improved by increasing the Reynolds numbers, the concentration of non-Newtonian fluids and the aspect ratio of the main channel section, and decreasing the curved radius of the main channel section.
摘要 i
英文摘要 ii
致謝 iii
目錄 iv
圖目錄 vii
符號說明 xii

第一章 緒論 1
1-1 研究背景 1
1-2 文獻回顧 1
1-3 研究動機 3
1-4 本文架構 4
第二章 理論與數值模擬 5
2-1 基本假設 5
2-2 微混合器的幾何尺寸 6
2-2-1 直流道混合器 6
2-2-2 單一彎曲流道混合器 6
2-2-3 S型流道混合器 6
2-2-4 多重彎曲流道混合器 6
2-3 統御方程式 7
2-4 邊界條件 8
2-5 無因次分析 10
2-5-1 方程式的無因次化 10
2-5-2 邊界條件的無因次化 11
2-6 數值模擬 12
2-6-1 CFD-GEOM幾何形狀與網格建立 12
2-6-2 CFD-ACE+模擬計算求解 12
2-6-3 CFD-VIEW後處理 13
2-7 混合指標 13
第三章 微型混合器的製作與觀測 15
3-1 實驗流程 15
3-1-1 光罩製作 15
3-1-2 母模製作 15
3-1-3 翻模製作微混合器 17
3-1-4 PDMS成品接合與管線接合 18
3-2 實驗流程 18
3-2-1 工作流體與微量式注射幫浦 18
3-2-2 微混合器實驗前置作業 19
3-2-3 影像擷取 19
第四章 結果與討論 20
4-1 簡介 20
4-2 以S型微混合器作格點測試 20
4-3 數值結果與實驗結果之比較 21
4-4 非牛頓系流體在S型流道混合器中之混合與流率(雷諾數)之關係 21
4-5 不同流體在S型流道混合器中之混合的比較 23
4-6 幾何參數對彎曲流道混合器中非牛頓流體之混合的影響 25
4-6-1 具S形流道之微混合器與具直流道之微混合器之比較 25
4-6-2 彎曲程度對混合效率的影響 25
4-6-3 主流道截面形狀對混合效率的影響 26
4-6-4 連續彎曲流道對混合效率的影響 27
第五章 結論與展望 28
5-1 結論 28
5-2 展望 28
參考文獻 29
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