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Water-silicone oil two-phase flow hydrodynamics in a square glass microchannel

Wu, Zan LU ; Svensson, Astrid LU ; Qian, Jin Yuan LU and Sunden, Bengt LU (2018) ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018 In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018
Abstract

This work visualized water-silicone oil two-phase flow patterns both at the inlet cross-junction and in the main square microchannel with a channel width of 400 µm. Tubing/threading, dripping and jetting were identified at the inlet junction while annular, slug and droplet flows were categorized in the main microchannel at 50 mm downstream of the junction. Flow patterns were represented in terms of superficial velocities and dimensionless numbers. Compared to water-silicone oil flow, addition of surfactant sodium dodecyl sulfate (SDS) in water, with a dilute SDS concentration of 1000 ppm, narrows the dripping regime and widens the jetting regime at the inlet junction, while narrows the slug flow regime and widens the droplet flow regime... (More)

This work visualized water-silicone oil two-phase flow patterns both at the inlet cross-junction and in the main square microchannel with a channel width of 400 µm. Tubing/threading, dripping and jetting were identified at the inlet junction while annular, slug and droplet flows were categorized in the main microchannel at 50 mm downstream of the junction. Flow patterns were represented in terms of superficial velocities and dimensionless numbers. Compared to water-silicone oil flow, addition of surfactant sodium dodecyl sulfate (SDS) in water, with a dilute SDS concentration of 1000 ppm, narrows the dripping regime and widens the jetting regime at the inlet junction, while narrows the slug flow regime and widens the droplet flow regime in the main microchannel. A decrease in dynamic interfacial tension due to SDS addition is supposed to be the reason for such a flow pattern modification. Besides, for slug flow, the slug length can be scaled as a power law of the flow rate ratio and the Capillary number of the organic phase. The slug velocity is linearly dependent on the bulk average velocity for both cases with and without SDS addition.

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Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018
publisher
American Society of Mechanical Engineers(ASME)
conference name
ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018
conference location
Dubrovnik, Croatia
conference dates
2018-06-10 - 2018-06-13
external identifiers
  • scopus:85053932928
ISBN
9780791851197
DOI
10.1115/ICNMM2018-7661
language
English
LU publication?
yes
id
79c111cb-0eda-4894-8431-fc2a0a7d91f2
date added to LUP
2018-10-22 14:44:44
date last changed
2018-10-22 15:42:05
@inproceedings{79c111cb-0eda-4894-8431-fc2a0a7d91f2,
  abstract     = {<p>This work visualized water-silicone oil two-phase flow patterns both at the inlet cross-junction and in the main square microchannel with a channel width of 400 µm. Tubing/threading, dripping and jetting were identified at the inlet junction while annular, slug and droplet flows were categorized in the main microchannel at 50 mm downstream of the junction. Flow patterns were represented in terms of superficial velocities and dimensionless numbers. Compared to water-silicone oil flow, addition of surfactant sodium dodecyl sulfate (SDS) in water, with a dilute SDS concentration of 1000 ppm, narrows the dripping regime and widens the jetting regime at the inlet junction, while narrows the slug flow regime and widens the droplet flow regime in the main microchannel. A decrease in dynamic interfacial tension due to SDS addition is supposed to be the reason for such a flow pattern modification. Besides, for slug flow, the slug length can be scaled as a power law of the flow rate ratio and the Capillary number of the organic phase. The slug velocity is linearly dependent on the bulk average velocity for both cases with and without SDS addition.</p>},
  author       = {Wu, Zan and Svensson, Astrid and Qian, Jin Yuan and Sunden, Bengt},
  booktitle    = {ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018},
  isbn         = {9780791851197},
  language     = {eng},
  location     = {Dubrovnik, Croatia},
  publisher    = {American Society of Mechanical Engineers(ASME)},
  title        = {Water-silicone oil two-phase flow hydrodynamics in a square glass microchannel},
  url          = {http://dx.doi.org/10.1115/ICNMM2018-7661},
  year         = {2018},
}