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Liquid-liquid two-phase flow patterns in ultra-shallow straight and serpentine microchannels

Wu, Zan LU and Sundén, Bengt LU (2019) In Heat and Mass Transfer/Waerme- und Stoffuebertragung 55(4). p.1095-1108
Abstract

Water-butanol and water-hexane flows were visualized in ultra-shallow straight and serpentine microchannels with a cross-junction. At the inlet cross-junction, three major flow patterns including tubing/threading, dripping and jetting were mapped using the aqueous Capillary number versus the organic Weber number. Correspondingly, in the main microchannel, annular flow, slug flow and droplet flow were mapped using combined dimensionless numbers (Weber number times Ohnesorge number) of both phases. The flow pattern transitions were explained based on a force analysis, considering the phase flow rates, junction angle between the side feeding channels and the central feeding channel as well as aspect ratios. Compared to the straight... (More)

Water-butanol and water-hexane flows were visualized in ultra-shallow straight and serpentine microchannels with a cross-junction. At the inlet cross-junction, three major flow patterns including tubing/threading, dripping and jetting were mapped using the aqueous Capillary number versus the organic Weber number. Correspondingly, in the main microchannel, annular flow, slug flow and droplet flow were mapped using combined dimensionless numbers (Weber number times Ohnesorge number) of both phases. The flow pattern transitions were explained based on a force analysis, considering the phase flow rates, junction angle between the side feeding channels and the central feeding channel as well as aspect ratios. Compared to the straight microchannel, the dripping regime at the inlet junction and the slug flow occupy larger zones in serpentine microchannels because the centrifugal force tends to break up the organic annular core into slugs and droplets over the bends.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Heat and Mass Transfer/Waerme- und Stoffuebertragung
volume
55
issue
4
pages
1095 - 1108
publisher
Springer
external identifiers
  • scopus:85054576938
ISSN
0947-7411
DOI
10.1007/s00231-018-2494-0
language
English
LU publication?
yes
id
057dbe48-c433-4416-bdfb-c63f9e543fc4
date added to LUP
2018-11-01 09:23:22
date last changed
2020-03-24 06:28:01
@article{057dbe48-c433-4416-bdfb-c63f9e543fc4,
  abstract     = {<p>Water-butanol and water-hexane flows were visualized in ultra-shallow straight and serpentine microchannels with a cross-junction. At the inlet cross-junction, three major flow patterns including tubing/threading, dripping and jetting were mapped using the aqueous Capillary number versus the organic Weber number. Correspondingly, in the main microchannel, annular flow, slug flow and droplet flow were mapped using combined dimensionless numbers (Weber number times Ohnesorge number) of both phases. The flow pattern transitions were explained based on a force analysis, considering the phase flow rates, junction angle between the side feeding channels and the central feeding channel as well as aspect ratios. Compared to the straight microchannel, the dripping regime at the inlet junction and the slug flow occupy larger zones in serpentine microchannels because the centrifugal force tends to break up the organic annular core into slugs and droplets over the bends.</p>},
  author       = {Wu, Zan and Sundén, Bengt},
  issn         = {0947-7411},
  language     = {eng},
  number       = {4},
  pages        = {1095--1108},
  publisher    = {Springer},
  series       = {Heat and Mass Transfer/Waerme- und Stoffuebertragung},
  title        = {Liquid-liquid two-phase flow patterns in ultra-shallow straight and serpentine microchannels},
  url          = {http://dx.doi.org/10.1007/s00231-018-2494-0},
  doi          = {10.1007/s00231-018-2494-0},
  volume       = {55},
  year         = {2019},
}