臺灣博碩士論文加值系統

本實驗設計七種不同混合角度的微混合器，採用電滲驅動的方式驅動流體(Ex = 5 - 25 kV/m)，利用微質點影像測速儀(μPIV)，量測渠道中的速度場分佈，並分析兩入口渠道對衝所產生的停滯區大小對混合長度的影響。本實驗並以微雷射誘發螢光技術(μLIF)量測各微渠道之混合長度與混合效率，分析混合角度及焦耳熱效應對混合效率的影響。實驗結果顯示，停滯區能夠增加混合效率，其中尤以-60°混合角度之停滯區最大，混合效率最好，同時焦耳熱效應也對混合效率有些微的幫助。

This study proposed a Y-type mixer which was driven by electroosmotic flow (Ex = 5 - 25 kV/m) with 7 different mixing angles (30°, 60°, 90°, 120°, -120°, -90°, -60°) to enhance mixing efficiency . The mixing performance of the device was demonstrated by using micro laser-induced fluorescence (μLIF) technology to quantify the concentration distribution in the microchannel. Also, micro particle image velocimetry (μPIV) was used for velocity measurements and analysis. It was found that the negative mixing angle could induce larger dead zone area than the positive one. The joule heating effect was found when electric field strength was larger than 15 kV/m. The combined dead zone and joule heating effect could enhance the mixing performance slightly. Although it has only a marginal effect on the mixing length for the positive mixing angles. Negative mixing angles allow a reduction of mixer size, which means a more efficient use of material and space. Finally, the best mixing angle was found to be -60°.

目錄 i
表目錄 iii
圖目錄 iv
符號說明 vi
中文摘要 viii
Abstract ix
第一章　序論 1
1-1 前言 1
1-2 微流體系統 2
1-3 混合器種類與混合機制 3
1-4 電滲現象 4
1-5 焦耳熱效應 5
1-6 研究背景與目的 5
1-7 文獻回顧 6
第二章　實驗系統與設備 10
2-1 μPIV及μLIF系統 10
2-2 製程設備 11
2-3 實驗相關設備 13
第三章　實驗方法及步驟 26
3-1 微混合器設計與製程 26
3-2 工作流體配製 28
3-3 μPIV/μLIF量測系統建立 28
3-4 分析方法 29
3-5 實驗參數及範圍 32
第四章　理論分析 42
4-1 雷諾數 (Reynolds number) 42
4-2 培克數 (Peclet number) 42
4-3 電滲之理論方程式 42
4-4 速度分析 43
4-5 布朗運動與Einstein-Smoluchowski 方程式 44
4-6 混合效率 44
第五章　誤差分析 46
第六章　結果與討論 50
6-1 μPIV之流場量測 50
6-2 停滯區(Dead zone)分析 50
6-3 μLIF之濃度場量測 51
6-4 混合角度對混合效率之影響 52
6-5 電場強度對混合效率之影響 53
6-6 關係式建立 53
第七章　結論與建議 67
7-1 結論 67
7-2 建議與改進 68
參考文獻 69
附錄 A 75

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