Investigation on the Flow and Mixing in Millimeter Cross Flo

发布时间：2023-05-19 23:03

　　本文采用激光诱导荧光(LIF)和粒子图像测速(PIV)技术,对毫米级错流(CF)通道中的快速流动(FF)和混合进行了研究。对毫米错流混合器中的快速混和行为的实验研究为进一步的数值模拟提供了基础数据。在快速流动压力条件下,刻有毫米通道的组装而成的PMMA板顺利通过了强度测试。为了研究混合效率与混合室尺寸的关系,我们对混合腔室尺寸分别为1 × 1 × 1、3×3×1、5×5×1、7×7×1 mm(长×宽×高)的混合通道进行了实验研究。在高雷诺数下,混合腔室的尺寸越大,当流线形成特定的模式时,越多的液体停留在混合腔室内。在不明显增加界面面积的情况下,较宽腔室中液体的停留时间增加,进而在初始的扇形区域内可获得更好的混合效果。对比于简单的T形1 × 1 × 1mm通道,3 × 3 × 1mm腔室通道在分层混合区,扩散时间几乎没有增加。在5×5 × 1mm的混合腔室中,当速度为4.5 m/s时出现了涡流混合区。当流速超过6 m/s时,液体在混合通道入口处形成涡流。此时,流体会刮掉混合区域过渡壁的轮廓。实验表明,使用PIV技术测量的流速与使用流量估计的流速吻合较好。在撞击区,速度的分布与混合通道的末...

【文章页数】：75 页

【学位级别】：硕士

【文章目录】：
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



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