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  5. Dynamics of a particle-laden bubble colliding with an air-liquid interface
 
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Dynamics of a particle-laden bubble colliding with an air-liquid interface
File(s)
Supplemental file.docx (12.95 KB)
Supporting information
CEJ-D-21-09445-ACCEPTED.pdf (1.58 MB)
Accepted version
Author(s)
Wang, Peipei
Brito-Parada, Pablo R
Type
Journal Article
Abstract
The collision, bouncing and potential bursting of air bubbles with air-liquid interfaces are key processes involved in the initial stage of foam formation. While fundamental studies of these processes, especially for gas-liquid-solid froth systems, are very valuable for a better understanding of various chemical engineering separation systems, these are scarce. This paper investigates the dynamics of rising bubbles, without particles attached and with various particle coverages, as they collide with an air-liquid interface. For uncoated bubbles, an increase in distance from the bubble releasing point to the air-liquid interface resulted in higher bubble approach velocities, although with minor changes in the velocity fluctuation frequency. This increase in approach velocity was not observed for bubbles with relatively high particle coverage. For particle-laden bubbles, the collision with the interface is associated with movement of the particles over the surface of the decelerating bubble. This particle motion on the bubble surface, combined with bubble shape pulsation, contributes to the kinetic energy dissipation of the approaching bubble. A damped oscillation model was derived to represent the velocity of the bubble interacting with the interface, which shows that the amplitude of the velocity decreases gradually with the increase in particle coverage. The damping coefficient in the model, introduced to quantify the influence of attached particles, is shown to increase with particle coverage, confirming the key role that particles play in bubble collision dynamics at an air-liquid interface and allowing, for the first time, the prediction of their behavior.
Date Issued
2022-02
Date Acceptance
2021-09-08
Citation
Chemical Engineering Journal, 2022, 429, pp.1-10
URI
http://hdl.handle.net/10044/1/91899
URL
https://www.sciencedirect.com/science/article/pii/S1385894721040055?via%3Dihub
DOI
https://www.dx.doi.org/10.1016/j.cej.2021.132427
ISSN
1385-8947
Publisher
Elsevier BV
Start Page
1
End Page
10
Journal / Book Title
Chemical Engineering Journal
Volume
429
Copyright Statement
© 2021 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
License URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S1385894721040055?via%3Dihub
Subjects
0904 Chemical Engineering
0905 Civil Engineering
0907 Environmental Engineering
Chemical Engineering
Publication Status
Published
Article Number
132427
Date Publish Online
2021-09-13
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