Mass transfer and modeling of deformed bubbles in square microchannel
Yang, Shuo LU
; Kong, Gaopan
LU
; Cao, Zhen
LU
and Wu, Zan
LU
(2023)
In Chemical Engineering Journal Advances
16.
- Abstract
Understanding of mass transfer in gas-liquid slug flow is imperative to design and optimize micro-reactors. There exist extensive studies on symmetric bubbles by the phase volume monitor technique, whereas deformed bubbles are rarely studied due to the limitation of volume calculation methods. In this work, CO2-water and N2-water two-phase flows were investigated in a square microchannel, obtaining annular flow, slug flow, and bubbly flow. A flow pattern map was then proposed and compared with the literature. A 3D slicing technique was developed to measure the volume and interfacial area of bubble, including symmetric bubbles and deformed bubbles, by slicing the bubble along the streamwise direction. Scaling laws... (More)
Understanding of mass transfer in gas-liquid slug flow is imperative to design and optimize micro-reactors. There exist extensive studies on symmetric bubbles by the phase volume monitor technique, whereas deformed bubbles are rarely studied due to the limitation of volume calculation methods. In this work, CO2-water and N2-water two-phase flows were investigated in a square microchannel, obtaining annular flow, slug flow, and bubbly flow. A flow pattern map was then proposed and compared with the literature. A 3D slicing technique was developed to measure the volume and interfacial area of bubble, including symmetric bubbles and deformed bubbles, by slicing the bubble along the streamwise direction. Scaling laws of the important parameters that characterize the micro-reactors were proposed. Mass transfer coefficients kLa were quantified from the time-changing volume. The empirical correlation involving dimensionless numbers were fitted, which shows accurate predictive performance for mass transfer coefficients in this study and literatures. The bigger index of Reynolds number ReG indicated that gas flow condition is the main influencing factor during mass transfer process. To have a better universality, a new semi-theoretical model involving the ratio of the size of the liquid and gas phases LL/LG was developed based on the Pigford and Higbie penetration theory because experimental data confirms that the degree of bubble deformation is related to LL/LG. The semi-theoretical model shows a satisfactory agreement over the whole range of slug flow in this study.
(Less)
- author
- Yang, Shuo
LU
; Kong, Gaopan
LU
; Cao, Zhen
LU
and Wu, Zan
LU
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- 3D reconstruction, Digital image analysis, Mass transfer, Microchannel, Scaling law, Slug flow
- in
- Chemical Engineering Journal Advances
- volume
- 16
- article number
- 100518
- publisher
- Elsevier
- external identifiers
-
- scopus:85162921032
- ISSN
- 2666-8211
- DOI
- 10.1016/j.ceja.2023.100518
- language
- English
- LU publication?
- yes
- id
- 1ccb1f01-96b6-461b-9dda-22fc62267a4a
- date added to LUP
- 2023-08-24 15:02:19
- date last changed
- 2024-01-20 02:09:21
@article{1ccb1f01-96b6-461b-9dda-22fc62267a4a,
abstract = {{<p>Understanding of mass transfer in gas-liquid slug flow is imperative to design and optimize micro-reactors. There exist extensive studies on symmetric bubbles by the phase volume monitor technique, whereas deformed bubbles are rarely studied due to the limitation of volume calculation methods. In this work, CO<sub>2</sub>-water and N<sub>2</sub>-water two-phase flows were investigated in a square microchannel, obtaining annular flow, slug flow, and bubbly flow. A flow pattern map was then proposed and compared with the literature. A 3D slicing technique was developed to measure the volume and interfacial area of bubble, including symmetric bubbles and deformed bubbles, by slicing the bubble along the streamwise direction. Scaling laws of the important parameters that characterize the micro-reactors were proposed. Mass transfer coefficients k<sub>L</sub>a were quantified from the time-changing volume. The empirical correlation involving dimensionless numbers were fitted, which shows accurate predictive performance for mass transfer coefficients in this study and literatures. The bigger index of Reynolds number Re<sub>G</sub> indicated that gas flow condition is the main influencing factor during mass transfer process. To have a better universality, a new semi-theoretical model involving the ratio of the size of the liquid and gas phases L<sub>L</sub>/L<sub>G</sub> was developed based on the Pigford and Higbie penetration theory because experimental data confirms that the degree of bubble deformation is related to L<sub>L</sub>/L<sub>G</sub>. The semi-theoretical model shows a satisfactory agreement over the whole range of slug flow in this study.</p>}},
author = {{Yang, Shuo and Kong, Gaopan and Cao, Zhen and Wu, Zan}},
issn = {{2666-8211}},
keywords = {{3D reconstruction; Digital image analysis; Mass transfer; Microchannel; Scaling law; Slug flow}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Chemical Engineering Journal Advances}},
title = {{Mass transfer and modeling of deformed bubbles in square microchannel}},
url = {{http://dx.doi.org/10.1016/j.ceja.2023.100518}},
doi = {{10.1016/j.ceja.2023.100518}},
volume = {{16}},
year = {{2023}},
}