Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

doi:10.1016/j.cjche.2022.07.013

Chinese Journal of Chemical Engineering ›› 2023, Vol. 56 ›› Issue (4): 281-289.DOI: 10.1016/j.cjche.2022.07.013

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Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

Ming Chen¹, Huiyan Jiao¹, Jun Li¹, Zhibin Wang², Feng He², Yang Jin¹

1. Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. The Key Laboratory of Fine Chemical Application Technology of Luzhou, Sichuan Vocational College of Chemical Technology, Luzhou 646300, China

Received:2022-01-12 Revised:2022-07-07 Online:2023-06-13 Published:2023-04-28
Contact: Yang Jin,E-mail:jinyangyoung@126.com
Supported by:
Financial supports from the following programs: the National Natural Science Foundation of China (21776180, 22108177), and the open project of the Key Laboratory of Fine Chemical Application Technology of Luzhou (HYJH-2102-A).

Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

Ming Chen¹, Huiyan Jiao¹, Jun Li¹, Zhibin Wang², Feng He², Yang Jin¹

1. Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. The Key Laboratory of Fine Chemical Application Technology of Luzhou, Sichuan Vocational College of Chemical Technology, Luzhou 646300, China

通讯作者: Yang Jin,E-mail:jinyangyoung@126.com
基金资助:
Financial supports from the following programs: the National Natural Science Foundation of China (21776180, 22108177), and the open project of the Key Laboratory of Fine Chemical Application Technology of Luzhou (HYJH-2102-A).

Abstract

Abstract: In this work, flow pattern and mass transfer of liquid–liquid two-phase flow in a wire-embedded concentric microchannel are studied using toluene–water system. Droplet flow, slug flow, oval flow and annular flow are observed in the wire-embedded concentric microchannel. The effects of embedded wires and physical properties on flow patterns are investigated. The embedded wire insert is conducive to the formation of annular flow. The flow pattern distribution regions are distinguished by the Ca_aq (capillary number)–We_org (Weber number) flow pattern map. When We_org<0.001, slug flow is the main flow pattern, and when We_org>0.1, annular flow is the main flow pattern. Oval flow and droplet flow are between We_org = 0.001–0.1, and oval flow is transformed into droplet flow with the increase of Ca_aq. The effect of flow rate, phase ratio, initial acetic acid concentration, insert shape and flow patterns on mass transfers are studied. Mass transfer process is enhanced under annular flow conditions, the volumetric mass transfer coefficient is up to 0.36 s^-1 because of the high interfacial area and interface renewal rate of annular flow.

Key words: Flow pattern, Mass transfer, Microchannels, Two-phase flow

摘要： In this work, flow pattern and mass transfer of liquid–liquid two-phase flow in a wire-embedded concentric microchannel are studied using toluene–water system. Droplet flow, slug flow, oval flow and annular flow are observed in the wire-embedded concentric microchannel. The effects of embedded wires and physical properties on flow patterns are investigated. The embedded wire insert is conducive to the formation of annular flow. The flow pattern distribution regions are distinguished by the Ca_aq (capillary number)–We_org (Weber number) flow pattern map. When We_org<0.001, slug flow is the main flow pattern, and when We_org>0.1, annular flow is the main flow pattern. Oval flow and droplet flow are between We_org = 0.001–0.1, and oval flow is transformed into droplet flow with the increase of Ca_aq. The effect of flow rate, phase ratio, initial acetic acid concentration, insert shape and flow patterns on mass transfers are studied. Mass transfer process is enhanced under annular flow conditions, the volumetric mass transfer coefficient is up to 0.36 s^-1 because of the high interfacial area and interface renewal rate of annular flow.

关键词: Flow pattern, Mass transfer, Microchannels, Two-phase flow

Ming Chen, Huiyan Jiao, Jun Li, Zhibin Wang, Feng He, Yang Jin. Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance[J]. Chinese Journal of Chemical Engineering, 2023, 56(4): 281-289.

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Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

Liquid–liquid two-phase flow in a wire-embedded concentric microchannel: Flow pattern and mass transfer performance

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