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Experimental study of gas-Liquid Mass transfer in a rectangular microchannel by digital image analysis method

Yang, Shuo LU orcid ; Kong, Gaopan LU and Wu, Zan LU (2021) ASME 2021 International Mechanical Engineering Congress and Exposition
Abstract
Study of mass transfer in microchannels is indispensable for
the design of microreactors. Gas-phase volume monitoring
method has been widely used to study the mass transfer process.
When using this method, bubble length was measured in most
studies to calculate the bubble volume by assuming a
symmetrical bubble shape. Therefore, this method is not suitable
for asymmetric bubbles. The present study focuses on the mass
transfer of CO2 bubbles in a flat rectangular microchannel by
using the method of digital image analysis (DIA), especially for
deformed bubbles. The dynamics of gas-liquid flow at different
volumetric flow rates were observed by a high-speed recording
system. Flow patterns... (More)
Study of mass transfer in microchannels is indispensable for
the design of microreactors. Gas-phase volume monitoring
method has been widely used to study the mass transfer process.
When using this method, bubble length was measured in most
studies to calculate the bubble volume by assuming a
symmetrical bubble shape. Therefore, this method is not suitable
for asymmetric bubbles. The present study focuses on the mass
transfer of CO2 bubbles in a flat rectangular microchannel by
using the method of digital image analysis (DIA), especially for
deformed bubbles. The dynamics of gas-liquid flow at different
volumetric flow rates were observed by a high-speed recording
system. Flow patterns were mapped and scaling laws were given
for bubble size and bubble velocity. The results showed that the
bubble volume increases as gas flow rate increases, while
decreases as liquid flow rate increases. It can be explained by the
bubble breakup mechanism. Besides, the bubble velocity
increases as gas and liquid flow rates increase. The mass transfer
of CO2 from bubbles to liquid slugs was quantitatively
characterized by volumetric mass transfer coefficient kLa. The
results showed that kLa and kL increase with increasing of
superficial gas and liquid velocities. The same tendencies can be
found in the literature. Finally, new mass transfer correlations
were proposed. Predictions from the correlations showed a good
agreement with the experimental data. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Rectangular microchannel, mass transfer, digital image analysis, gas-liquid, scaling law
host publication
ASME International Mechanical Engineering Congress and Exposition : Volume 10: Fluids Engineering - Volume 10: Fluids Engineering
article number
IMECE2021-69095, V010T10A040
pages
9 pages
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME 2021 International Mechanical Engineering Congress and Exposition
conference location
Virtual
conference dates
2021-11-01 - 2021-11-05
external identifiers
  • scopus:85124380210
ISBN
978-0-7918-8566-6
DOI
10.1115/IMECE2021-69095
language
English
LU publication?
yes
id
635a2e8e-fdff-4c02-8c55-5787f5481847
date added to LUP
2022-11-11 14:48:48
date last changed
2024-01-30 10:06:36
@inproceedings{635a2e8e-fdff-4c02-8c55-5787f5481847,
  abstract     = {{Study of mass transfer in microchannels is indispensable for <br/>the design of microreactors. Gas-phase volume monitoring <br/>method has been widely used to study the mass transfer process.<br/>When using this method, bubble length was measured in most <br/>studies to calculate the bubble volume by assuming a <br/>symmetrical bubble shape. Therefore, this method is not suitable <br/>for asymmetric bubbles. The present study focuses on the mass <br/>transfer of CO2 bubbles in a flat rectangular microchannel by <br/>using the method of digital image analysis (DIA), especially for <br/>deformed bubbles. The dynamics of gas-liquid flow at different <br/>volumetric flow rates were observed by a high-speed recording <br/>system. Flow patterns were mapped and scaling laws were given <br/>for bubble size and bubble velocity. The results showed that the <br/>bubble volume increases as gas flow rate increases, while <br/>decreases as liquid flow rate increases. It can be explained by the <br/>bubble breakup mechanism. Besides, the bubble velocity <br/>increases as gas and liquid flow rates increase. The mass transfer <br/>of CO2 from bubbles to liquid slugs was quantitatively <br/>characterized by volumetric mass transfer coefficient kLa. The <br/>results showed that kLa and kL increase with increasing of <br/>superficial gas and liquid velocities. The same tendencies can be <br/>found in the literature. Finally, new mass transfer correlations <br/>were proposed. Predictions from the correlations showed a good <br/>agreement with the experimental data.}},
  author       = {{Yang, Shuo and Kong, Gaopan and Wu, Zan}},
  booktitle    = {{ASME International Mechanical Engineering Congress and Exposition : Volume 10: Fluids Engineering}},
  isbn         = {{978-0-7918-8566-6}},
  keywords     = {{Rectangular microchannel; mass transfer; digital image analysis; gas-liquid; scaling law}},
  language     = {{eng}},
  month        = {{11}},
  publisher    = {{American Society Of Mechanical Engineers (ASME)}},
  title        = {{Experimental study of gas-Liquid Mass transfer in a rectangular microchannel by digital image analysis method}},
  url          = {{http://dx.doi.org/10.1115/IMECE2021-69095}},
  doi          = {{10.1115/IMECE2021-69095}},
  year         = {{2021}},
}