發(fā)布時間：2023-05-19 23:03

　　本文采用激光誘導(dǎo)熒光(LIF)和粒子圖像測速(PIV)技術(shù),對毫米級錯流(CF)通道中的快速流動(FF)和混合進行了研究。對毫米錯流混合器中的快速混和行為的實驗研究為進一步的數(shù)值模擬提供了基礎(chǔ)數(shù)據(jù)。在快速流動壓力條件下,刻有毫米通道的組裝而成的PMMA板順利通過了強度測試。為了研究混合效率與混合室尺寸的關(guān)系,我們對混合腔室尺寸分別為1 × 1 × 1、3×3×1、5×5×1、7×7×1 mm(長×寬×高)的混合通道進行了實驗研究。在高雷諾數(shù)下,混合腔室的尺寸越大,當(dāng)流線形成特定的模式時,越多的液體停留在混合腔室內(nèi)。在不明顯增加界面面積的情況下,較寬腔室中液體的停留時間增加,進而在初始的扇形區(qū)域內(nèi)可獲得更好的混合效果。對比于簡單的T形1 × 1 × 1mm通道,3 × 3 × 1mm腔室通道在分層混合區(qū),擴散時間幾乎沒有增加。在5×5 × 1mm的混合腔室中,當(dāng)速度為4.5 m/s時出現(xiàn)了渦流混合區(qū)。當(dāng)流速超過6 m/s時,液體在混合通道入口處形成渦流。此時,流體會刮掉混合區(qū)域過渡壁的輪廓。實驗表明,使用PIV技術(shù)測量的流速與使用流量估計的流速吻合較好。在撞擊區(qū),速度的分布與混合通道的末...

【文章頁數(shù)】：75 頁

【學(xué)位級別】：碩士

【文章目錄】：
abstract
摘要
CHAPTER 1: INTRODUCTION
    1.1 Development of microreactors
    1.2 Active and passive mixing regimes
    1.3 Research objectives and motivation
        1.3.1 Objectives
        1.3.2 Layouts of the thesis
CHAPTER 2: EXPERIMENTAL SETUP AND CFD MODELS
    2.1 Experimental setup
    2.2 Channel manufacturing process
        2.2.1 Drilling channel patterns
        2.2.2 Bonding of the substrates
    2.3 Calibration preparation
    2.4 CFD Model
    2.5 Mesh comparison
CHAPTER 3: PIV EXPERIMENT ANALYSIS. VELOCITY DISTRIBUTION ANDCFD SIMULATION ON VELOCITY MAGNITUDE
    3.1 PIV Technique
    3.2 Velocity behavior in the chamber
        3.2.1 Experimental data vector results
CHAPTER 4: FAST MIXING ANALYSIS AND COMPARISON OF EXPERIMENTALDATA AND SIMULATION DATA
    4.1 Major observations at the impinging point
    4.2 Simulation works on additional cross flow channel designs
        4.2.2 Velocity distribution in various cijr designs
    4.3 Comparision of experimental results on vortex T-mixer with computational 3D models
        4.3.1 Agreement of the simulation models with experimental data
CHAPTER 5: CONCLUSION
    5.1 Summary on the lif mixing investigation
    5.2 Piv system results of the velocity calculation
    5.3 Simulation correspondence of the mixing experiment
REFERENCES
ACKNOWLEDGEMENTS
INTRODUCTION TO SUPERVISOR AND AUTHOR
附件



本文編號：3820051