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Effects of size and sodium dodecyl sulfate on mass transfer for liquid-liquid two-phase flow in non-circular glass microchannels

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

This study concerns effects of two main variables on hydrodynamics and mass transfer in the liquid-liquid two-phase slug flow regime. The influence of size of square and rectangular microchannels and presence of sodium dodecyl sulfate (SDS) are investigated. Three microchannels with dimensions 600x600 (MC600), 400x400 (MC400) and 600x300 (MC300) µm were used with hydraulic diameters of 600, 400 and 400 µm respectively. The results revealed that decreasing the hydraulic diameter improved the interfacial area due to slug length enlargement in both phases. Furthermore, mass transfer resistance was reduced because of enhanced internal circulations, leading to considerable enhancement of the overall mass transfer coefficient KL. It was also... (More)

This study concerns effects of two main variables on hydrodynamics and mass transfer in the liquid-liquid two-phase slug flow regime. The influence of size of square and rectangular microchannels and presence of sodium dodecyl sulfate (SDS) are investigated. Three microchannels with dimensions 600x600 (MC600), 400x400 (MC400) and 600x300 (MC300) µm were used with hydraulic diameters of 600, 400 and 400 µm respectively. The results revealed that decreasing the hydraulic diameter improved the interfacial area due to slug length enlargement in both phases. Furthermore, mass transfer resistance was reduced because of enhanced internal circulations, leading to considerable enhancement of the overall mass transfer coefficient KL. It was also found that the enhancement of KL was greater in the square MC400 microchannel than in the rectangular MC300, as compared to the MC600. The enhancing benefit from internal circulations in organic slugs in rectangular microchannels decreased at higher aqueous flow rates due to enlarged stagnant liquid film flow between the organic slug and the microchannel wall. The presence of SDS slightly increased the interfacial area by reducing the slug length in both phases. However, there was a significant decrement in KL, due to a greater mass transfer resistance.

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type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018
article number
ICNMM2018-7626
pages
11 pages
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:85086056927
ISBN
9780791851197
DOI
10.1115/ICNMM2018-7626
language
English
LU publication?
yes
id
b266902d-35e7-43e4-b58b-33f0396d3c42
date added to LUP
2018-10-22 12:00:07
date last changed
2021-10-06 04:51:33
@inproceedings{b266902d-35e7-43e4-b58b-33f0396d3c42,
  abstract     = {<p>This study concerns effects of two main variables on hydrodynamics and mass transfer in the liquid-liquid two-phase slug flow regime. The influence of size of square and rectangular microchannels and presence of sodium dodecyl sulfate (SDS) are investigated. Three microchannels with dimensions 600x600 (MC600), 400x400 (MC400) and 600x300 (MC300) µm were used with hydraulic diameters of 600, 400 and 400 µm respectively. The results revealed that decreasing the hydraulic diameter improved the interfacial area due to slug length enlargement in both phases. Furthermore, mass transfer resistance was reduced because of enhanced internal circulations, leading to considerable enhancement of the overall mass transfer coefficient KL. It was also found that the enhancement of KL was greater in the square MC400 microchannel than in the rectangular MC300, as compared to the MC600. The enhancing benefit from internal circulations in organic slugs in rectangular microchannels decreased at higher aqueous flow rates due to enlarged stagnant liquid film flow between the organic slug and the microchannel wall. The presence of SDS slightly increased the interfacial area by reducing the slug length in both phases. However, there was a significant decrement in KL, due to a greater mass transfer resistance.</p>},
  author       = {Svensson, Astrid and Wu, Zan and Sunden, Bengt},
  booktitle    = {ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM 2018},
  isbn         = {9780791851197},
  language     = {eng},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Effects of size and sodium dodecyl sulfate on mass transfer for liquid-liquid two-phase flow in non-circular glass microchannels},
  url          = {http://dx.doi.org/10.1115/ICNMM2018-7626},
  doi          = {10.1115/ICNMM2018-7626},
  year         = {2018},
}