Hydrodynamics and mass transfer characteristics of liquid–liquid slug flow in microchannels: The effects of temperature, fluid properties and channel size
Hydrodynamics and mass transfer characteristics of liquid–liquid slug flow in microchannels: The effects of temperature, fluid properties and channel size
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微通道中液-液段塞流的流体动力学和传质特性：温度、流体性质和通道尺寸的影响
DOI：
10.1016/j.cej.2018.10.056
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发表时间：
2019-02
影响因子：
15.1
通讯作者：
Chen Guangwen
中科院分区：
文献类型：
--
作者：
Zhang Qi;Liu Hongchen;Zhao Shuainan;Yao Chaoqun;Chen Guangwen
使用甲苯-硫酸、甲苯-水和乙酸乙酯-水系统，研究了圆形 PTFE 毛细管中不混溶的液-液流动模式和传质。通过比较不同温度和毛细管直径下的段塞流运行范围，结果揭示了惯性和粘性力在段塞流向液滴流、段塞流向环形流转变中的作用。提出了基于C a C R e C 0.5 和C a D 0.7 R e D 0.5 复合项的通用流图来表示界面张力与惯性/粘性力之间的竞争，该图可以很好地预测流体粘度范围为0.85至1200 mPa·s的实验数据和文献结果。此外，还研究和讨论了温度对分散相段塞速度、比表面积和传质的影响，提供了对流动流体动力学的增量理解，并为优化反应器设计提供了更好的指导。
Immiscible liquid–liquid flow patterns and mass transfer were investigated in circular PTFE capillaries, with toluene-sulfuric acid, toluene-water and ethyl acetate-water systems. By comparing the slug flow operation range at different temperatures and capillary diameters, the results revealed the roles of inertia and viscous force in the transition from slug flow to droplet flow, and from slug flow to annular flow. A universal flow map based on composite terms of C a C R e C 0.5 and C a D 0.7 R e D 0.5 was proposed to represent the competition between interfacial tension and the inertia/viscous force, which can excellently predict experimental data and literature results with fluid viscosity ranging from 0.85 to 1200 mPa· s. Additionally, the effect of temperature on the dispersed phase slug velocity, specific surface area and mass transfer was investigated and discussed, providing incremental understanding on the flow hydrodynamics and better guidance for optimized reactor design.
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