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A comprehensive review on liquid–liquid two-phase flow in microchannel: flow pattern and mass transfer

  • Jin-yuan QianEmail author
  • Xiao-juan Li
  • Zan Wu
  • Zhi-jiang Jin
  • Bengt Sunden
Review
  • 207 Downloads

Abstract

Liquid–liquid two-phase flow in microchannel is very common in micro-chemical and micro-biological system, etc. Deep understanding of the liquid–liquid two-phase flow mechanisms and mass transfer in microchannel can promote industrial applications significantly. To summarize the recent research progress on the liquid–liquid two-phase flow in microchannel, this paper collects research work about this topic, especially focusing on flow pattern and mass transfer. To begin with, flow patterns observed in various conditions are identified and factors which influence the flow patterns are analyzed. Then, mass transfer in liquid–liquid two-phase flow is discussed, especially the mass transfer during droplet flow, with both experiments and simulations. Furthermore, energy dissipation involved in liquid–liquid two-phase flow in microchannel is also briefly discussed. Finally, future needs are proposed for extending the researches on liquid–liquid two-phase flow and enlarging its application fields.

Keywords

Flow pattern Mass transfer efficiency Energy dissipation Liquid–liquid two-phase flow Microchannel 

List of symbols

C

Concentration of solute

Ci

Arbitrary node concentration of the scalar

Cσ

Standard deviation

\( \bar{C} \)

Concentration which the mixing is achieving at ideal condition

\( \left\langle C \right\rangle \)

Statistical average value of the normalized concentration in the analyzed droplet

C*

Equilibrium concentration of solute

Ca

Capillary number

ci

Constant, i = 1, 2,3, …

dh

Hydraulic diameter

h

Channel depth or film thickness

IOS

Intensity of segregation

kLa

Overall volumetric mass transfer coefficient

ld

Droplet length

lU

Droplet unit length

MI

Mixing index

N

Number of the nodes in the analyzed droplet

Qd

Flow rate of the dispersed phase

Qc

Flow rate of the continuous phase

R

Radius of droplet cap

Re

Reynolds number

uc

Velocity of the continuous phase

ud

Velocity of the dispersed phase

v

Droplet velocity

wc

Continuous phase channel width

wd

Dispersed phase channel width

We

Weber number

Greek symbols

α

Dispersed phase length fraction

δ

Dimensionless surface roughness

εd

Dispersed phase fraction

λ

Viscosity ratio of the dispersed phase to the continuous phase

μ

Viscosity

θ

Contact angle

ρ

Density

σ

Interfacial tension

τ

Residence time

Φ

Flow rate ratio of the dispersed phase to the continuous phase

Γ

Ratio of channel depth to the continuous phase channel width

Λ

Ratio of the dispersed phase channel width to the continuous channel width

Ω

Dimensionless interfacial tension

Subscripts

aqu

Aqueous phase

c

Continuous phase

d

Dispersed phase

IL

Ionic liquid

KS

Kerosene phase

MF

Moving film

org

Organic phase

SF

Stagnant film

WF

With fim

WOF

Without film

WS

Water phase

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China through Grant No. 51805470, the Youth Funds of the State Key Laboratory of Fluid Power and Mechatronic Systems (Zhejiang University) through Grant No. SKLoFP-QN-1801, and the Fundamental Research Funds for the Central Universities through Grant No. 2018QNA4013.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Process Equipment, College of Energy EngineeringZhejiang UniversityHangzhouPeople’s Republic of China
  2. 2.State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhouPeople’s Republic of China
  3. 3.Department of Energy SciencesLund UniversityLundSweden

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