The Effect of the Size of Square Microchannels on Hydrodynamics and Mass Transfer during Liquid-Liquid Slug Flow

被引:42
作者
Sattari-Najafabadi, Mehdi [1 ,2 ]
Esfahany, Mohsen Nasr [1 ]
Wu, Zan [2 ]
Sunden, Bengt [2 ]
机构
[1] Isfahan Univ Technol, Dept Chem Engn, Esfahan 8415683111, Iran
[2] Lund Univ, Dept Energy Sci, SE-22100 Lund, Sweden
基金
瑞典研究理事会;
关键词
mass-transfer coefficient; interfacial area; slug flow; microchannel; diameter; EXTRACTION COLUMN; CAPILLARY MICROREACTOR; SILICA NANOPARTICLES; DYNAMIC-BEHAVIOR; CO2; ABSORPTION; PACKED-COLUMN; PRESSURE-DROP; PERFORMANCE; REACTORS; INTENSIFICATION;
D O I
10.1002/aic.15822
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The present study investigated the influence of square microchannel (MC) size on hydrodynamics and mass transfer in the liquid-liquid slug flow regime. Three square MCs with the hydraulic diameters of 200, 400, and 600 m were used. The employed method for estimating mass-transfer coefficients remarkably increased the accuracy of the results. The findings revealed that decreasing the MC size improved the interfacial area due to plug length enlargement and deteriorated mass-transfer resistances because of augmented internal circulations, leading to the considerable enhancement of mass-transfer coefficients. The increasing effect on the overall mass-transfer coefficient became greater with flow velocity, showing that size effect on mass-transfer resistances was more profound at higher flow velocities. The influence of size on the interfacial area was significantly greater than that on mass-transfer resistances due to the significant increment of wall film length with the decrease in channel size. (c) 2017 American Institute of Chemical Engineers
引用
收藏
页码:5019 / 5028
页数:10
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