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Hydrodynamics and mass transfer in liquid-liquid non-circular microchannels : Comparison of two aspect ratios and three junction structures

Sattari, Mehdi LU ; Nasr Esfahany, Mohsen; Wu, Zan LU and Sundén, Bengt LU (2017) In Chemical Engineering Journal 322. p.328-338
Abstract

Hydrodynamics and mass transfer in liquid-liquid slug flow inside a square microchannel (MC-1, aspect ratio 1) and a rectangular microchannel (MC-2, aspect ratio 2) with identical hydraulic diameter (400 µm) were investigated experimentally. The results showed that the overall volumetric mass transfer coefficient (KLa) in MC-2 was 16.2% lower than that in MC-1 due to enlargement of the dispersed phase slugs in MC-2, leading to development of stagnant zones within plugs and reduction of wall film renewal. Three different junction configurations (JC) were studied. KLa was enhanced by up to 34.8% using JC-1, compared to JC-2 or JC-3 due to greater movement of the biphasic interface, resulting in higher mixing within... (More)

Hydrodynamics and mass transfer in liquid-liquid slug flow inside a square microchannel (MC-1, aspect ratio 1) and a rectangular microchannel (MC-2, aspect ratio 2) with identical hydraulic diameter (400 µm) were investigated experimentally. The results showed that the overall volumetric mass transfer coefficient (KLa) in MC-2 was 16.2% lower than that in MC-1 due to enlargement of the dispersed phase slugs in MC-2, leading to development of stagnant zones within plugs and reduction of wall film renewal. Three different junction configurations (JC) were studied. KLa was enhanced by up to 34.8% using JC-1, compared to JC-2 or JC-3 due to greater movement of the biphasic interface, resulting in higher mixing within slugs using JC-1. The junction arrangement influenced not only the mass transfer during the slug-formation stage, but also the slug-flowing stage due to effects on the vortex patterns along the microchannel.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aspect ratio, Interfacial area, Mass transfer, Microchannel, Mixing junction
in
Chemical Engineering Journal
volume
322
pages
11 pages
publisher
Elsevier
external identifiers
  • scopus:85017478729
  • wos:000401594200033
ISSN
1385-8947
DOI
10.1016/j.cej.2017.04.028
language
English
LU publication?
yes
id
1a051024-81e6-4012-aff4-178d6577d541
date added to LUP
2017-05-08 09:18:30
date last changed
2017-09-18 13:34:18
@article{1a051024-81e6-4012-aff4-178d6577d541,
  abstract     = {<p>Hydrodynamics and mass transfer in liquid-liquid slug flow inside a square microchannel (MC-1, aspect ratio 1) and a rectangular microchannel (MC-2, aspect ratio 2) with identical hydraulic diameter (400 µm) were investigated experimentally. The results showed that the overall volumetric mass transfer coefficient (K<sub>L</sub>a) in MC-2 was 16.2% lower than that in MC-1 due to enlargement of the dispersed phase slugs in MC-2, leading to development of stagnant zones within plugs and reduction of wall film renewal. Three different junction configurations (JC) were studied. K<sub>L</sub>a was enhanced by up to 34.8% using JC-1, compared to JC-2 or JC-3 due to greater movement of the biphasic interface, resulting in higher mixing within slugs using JC-1. The junction arrangement influenced not only the mass transfer during the slug-formation stage, but also the slug-flowing stage due to effects on the vortex patterns along the microchannel.</p>},
  author       = {Sattari, Mehdi and Nasr Esfahany, Mohsen and Wu, Zan and Sundén, Bengt},
  issn         = {1385-8947},
  keyword      = {Aspect ratio,Interfacial area,Mass transfer,Microchannel,Mixing junction},
  language     = {eng},
  month        = {08},
  pages        = {328--338},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Journal},
  title        = {Hydrodynamics and mass transfer in liquid-liquid non-circular microchannels : Comparison of two aspect ratios and three junction structures},
  url          = {http://dx.doi.org/10.1016/j.cej.2017.04.028},
  volume       = {322},
  year         = {2017},
}