Liquid-liquid two-phase mass transfer characteristics in a rotating helical microchannel

doi:10.1016/j.cjche.2018.12.026

摘要/Abstract

摘要： In this work, the mass transfer characteristics of two immiscible fluids were investigated in a rotating helical microchannel with hydraulic diameter of 932 μm. Aqueous phosphoric acid solution and 80% tri-n-butyl phosphate (TBP) in kerosene were selected for the investigation of mass transfer performance in quartz glass/high density polyethylene (HDPE) microchannel. High dispersion between the two immiscible fluids can be obtained in the microchannel due to the intensifying action of centrifugal force, and the majority of the droplets with average diameter of 20-100 μm were produced in the microchannel. The flow rate and rotation speed were found to have great effects on the extraction efficiency and average residence time. The empirical correlation of average residence time based on experimental data was developed by theoretical analysis and data fitting method, and a mathematical model of the mass transfer coefficient in dispersed phase was proposed.

关键词: Microchannels, Mass transfer, Extraction, Immiscible fluids, Multiphase flow

Abstract: In this work, the mass transfer characteristics of two immiscible fluids were investigated in a rotating helical microchannel with hydraulic diameter of 932 μm. Aqueous phosphoric acid solution and 80% tri-n-butyl phosphate (TBP) in kerosene were selected for the investigation of mass transfer performance in quartz glass/high density polyethylene (HDPE) microchannel. High dispersion between the two immiscible fluids can be obtained in the microchannel due to the intensifying action of centrifugal force, and the majority of the droplets with average diameter of 20-100 μm were produced in the microchannel. The flow rate and rotation speed were found to have great effects on the extraction efficiency and average residence time. The empirical correlation of average residence time based on experimental data was developed by theoretical analysis and data fitting method, and a mathematical model of the mass transfer coefficient in dispersed phase was proposed.

Key words: Microchannels, Mass transfer, Extraction, Immiscible fluids, Multiphase flow

Yan Cao, Jun Li, Yang Jin, Jianhong Luo, Yubin Wang. Liquid-liquid two-phase mass transfer characteristics in a rotating helical microchannel[J]. 中国化学工程学报, 2019, 27(12): 2937-2947.

Yan Cao, Jun Li, Yang Jin, Jianhong Luo, Yubin Wang. Liquid-liquid two-phase mass transfer characteristics in a rotating helical microchannel[J]. Chinese Journal of Chemical Engineering, 2019, 27(12): 2937-2947.

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