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Vertical Squeezing Route Taylor Flow with Angled Microchannel Junctions
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-21 , DOI: 10.1021/acs.iecr.1c02324
An Eng Lim 1 , Yee Cheong Lam 1
Affiliation  

Heretofore, the microchannel junction angle θ dependent behavior on Taylor flow with a vertical squeezing route lacks a comprehensive understanding. An experimental study was performed on the vertical squeezing route Taylor flow for θ = 20, 45, 90, 135, and 160° at different flow rates of helium (He) and ethanol. By employing extreme θ of 20 and 160°, an in-depth knowledge of the associated mechanics is gained. Through the formulated theoretical model, the sizes of the bubble and slug were predicted quantitatively for various fluid flow rates and θ, with good qualitative and quantitative agreement with experimental results. With increasing liquid or decreasing gas flow rate, all the employed junction angle channels had insensitive unit cell volume VU variation with flow rate changes because of the near cancellation of the effect of increased liquid slug volume VS with the effect of decreased gas bubble volume VB. Using the 90° channel as the reference, the 20, 45, 135, and 160° channels generated larger VB and VS resulting in a larger VU. This is attributed to the wider junction width WJ when θ deviated from 90°. With the wider WJ, it produces a longer gas neck length that leads to a larger bubble length LB during the blocking process. The longer time due to the slower squeezing rate from the wider WJ results in LB growth during the squeezing process. As WJ values of 20 and 160° channels are similar (similar WJ for 45 and 135° channels), parabolic (U-shaped) trends for VB, VS, and VU against θ were observed for the various fluid flow rates. The understanding gained may be exploited for precise bubble and slug generation control for targeted applications.

中文翻译:

具有倾斜微通道连接点的垂直挤压路径泰勒流

迄今为止,对具有垂直挤压路线的泰勒流的微通道连接角 θ 依赖行为缺乏全面的理解。对 θ = 20、45、90、135 和 160° 在不同流速的氦 (He) 和乙醇下的垂直挤压路线泰勒流进行了实验研究。通过使用 20 和 160° 的极端 θ,可以获得对相关力学的深入了解。通过建立的理论模型,定量预测了各种流体流速和θ下气泡和段塞的尺寸,与实验结果具有良好的定性和定量一致性。随着液体流速的增加或气体流速的降低,所有采用的结角通道均具有不敏感的晶胞体积V U由于增加的液塞体积V S的影响与减小的气泡体积V B的影响几乎抵消了,因此随流速变化的变化。使用 90° 通道作为参考,20、45、135 和 160° 通道会产生更大的V BV S ,从而导致更大的V U。这归因于当 θ 偏离 90° 时更宽的结宽度W J。W J越宽,它产生的气颈长度越长,导致气泡长度L B越大在阻塞过程中。由于较宽的W J的较慢的挤压速率导致的较长时间导致挤压过程中的L B增长。由于20° 和 160° 通道的W J值相似(45°和 135° 通道的W J相似),因此观察到V BV SV U 相对于 θ 的各种流体流动的抛物线(U 形)趋势率。所获得的理解可用于针对目标应用的精确气泡和段塞生成控制。
更新日期:2021-10-06
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