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Liquid-liquid flow patterns and slug hydrodynamics in square microchannels of cross-shaped junctions

Wu, Zan LU ; Cao, Zhen LU and Sundén, Bengt LU (2017) In Chemical Engineering Science 174. p.56-66
Abstract

Flow patterns for water-butanol, water-toluene, water-hexane, water-oil and water/glycerol (weight ratio 60:40) mixture-oil two-phase flows were visualized in the cross-shaped junctions of three square glass microchannels with hydraulic diameters of 200 µm, 400 µm and 600 µm. The aqueous phase is the continuous phase contacting the channel walls while the organic phase is the dispersed phase in the experiments. Three main flow pattern groups were observed, including the tubing/threading regime group, the dripping regime and the jetting regime. The flow regimes were mapped based on the Capillary number of the continuous phase and the Weber number of the dispersed phase. The flow rate ratio and the Capillary number of the dispersed phase... (More)

Flow patterns for water-butanol, water-toluene, water-hexane, water-oil and water/glycerol (weight ratio 60:40) mixture-oil two-phase flows were visualized in the cross-shaped junctions of three square glass microchannels with hydraulic diameters of 200 µm, 400 µm and 600 µm. The aqueous phase is the continuous phase contacting the channel walls while the organic phase is the dispersed phase in the experiments. Three main flow pattern groups were observed, including the tubing/threading regime group, the dripping regime and the jetting regime. The flow regimes were mapped based on the Capillary number of the continuous phase and the Weber number of the dispersed phase. The flow rate ratio and the Capillary number of the dispersed phase were also employed to present flow patterns. The effects of hydraulic diameter of the square microchannels, flow rates, and physical properties, e.g., the interfacial tension and the viscosities of the aqueous and organic phases on flow pattern transitions were clarified. Besides, in the dripping regime, the dimensionless slug length can be scaled as a function of the Capillary number of the continuous phase for cross-shaped junctions. The slug velocity is linearly dependent on the average flow velocity in the dripping regime.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cross-shaped junction, Dripping, Flow pattern map, Liquid-liquid flow, Microreactor, Slug hydrodynamics
in
Chemical Engineering Science
volume
174
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85028958085
  • wos:000413321000005
ISSN
0009-2509
DOI
10.1016/j.ces.2017.08.032
language
English
LU publication?
yes
id
f0edb4f5-d3a7-42f0-8c1b-31f2d8728f4c
date added to LUP
2017-09-25 13:12:41
date last changed
2018-01-16 13:26:19
@article{f0edb4f5-d3a7-42f0-8c1b-31f2d8728f4c,
  abstract     = {<p>Flow patterns for water-butanol, water-toluene, water-hexane, water-oil and water/glycerol (weight ratio 60:40) mixture-oil two-phase flows were visualized in the cross-shaped junctions of three square glass microchannels with hydraulic diameters of 200 µm, 400 µm and 600 µm. The aqueous phase is the continuous phase contacting the channel walls while the organic phase is the dispersed phase in the experiments. Three main flow pattern groups were observed, including the tubing/threading regime group, the dripping regime and the jetting regime. The flow regimes were mapped based on the Capillary number of the continuous phase and the Weber number of the dispersed phase. The flow rate ratio and the Capillary number of the dispersed phase were also employed to present flow patterns. The effects of hydraulic diameter of the square microchannels, flow rates, and physical properties, e.g., the interfacial tension and the viscosities of the aqueous and organic phases on flow pattern transitions were clarified. Besides, in the dripping regime, the dimensionless slug length can be scaled as a function of the Capillary number of the continuous phase for cross-shaped junctions. The slug velocity is linearly dependent on the average flow velocity in the dripping regime.</p>},
  author       = {Wu, Zan and Cao, Zhen and Sundén, Bengt},
  issn         = {0009-2509},
  keyword      = {Cross-shaped junction,Dripping,Flow pattern map,Liquid-liquid flow,Microreactor,Slug hydrodynamics},
  language     = {eng},
  month        = {12},
  pages        = {56--66},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Science},
  title        = {Liquid-liquid flow patterns and slug hydrodynamics in square microchannels of cross-shaped junctions},
  url          = {http://dx.doi.org/10.1016/j.ces.2017.08.032},
  volume       = {174},
  year         = {2017},
}