LAPSE:2020.1273
Published Article
LAPSE:2020.1273
Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid
Przemysław Luty, Mateusz Prończuk
December 22, 2020
Bubble flow is present in many processes that are the subject of chemical engineering research. Many correlations for determination of the equivalent bubble diameter can be found in the scientific literature. However, there are only few describing the formation of gas bubbles in flowing liquid. Such a phenomenon occurs for instance in airlift apparatuses. Liquid flowing around the gas bubble creates a hydraulic drag force that leads to reduction of the formed bubble diameter. Usually the value of the hydraulic drag coefficient, cD, for bubble formation in the flowing liquid is assumed to be equal to the drag coefficient for bubbles rising in the stagnant liquid, which is far from the reality. Therefore, in this study, to determine the value of the drag coefficient of bubbles forming in flowing liquid, the diameter of the bubbles formed at different liquid velocity was measured using the shadowgraphy method. Using the balance of forces affecting the bubble formed in the coflowing liquid, the hydraulic drag coefficient was determined. The obtained values of the drag coefficient differed significantly from those calculated using the correlation for gas bubble rising in stagnant liquid. The proposed correlation allowed the determination of the diameter of the gas bubble with satisfactory accuracy.
Keywords
bubble diameter, bubble formation, concurrently flowing liquid, drag coefficient, force balance
Subject
Suggested Citation
Luty P, Prończuk M. Determination of a Bubble Drag Coefficient during the Formation of Single Gas Bubble in Upward Coflowing Liquid. (2020). LAPSE:2020.1273
Author Affiliations
Luty P: Faculty of Chemical Engineering and Technology, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland
Prończuk M: Faculty of Chemical Engineering and Technology, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland [ORCID]
Journal Name
Processes
Volume
8
Issue
8
Article Number
E999
Year
2020
Publication Date
2020-08-17
Published Version
ISSN
2227-9717
Version Comments
Original Submission
Other Meta
PII: pr8080999, Publication Type: Journal Article
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LAPSE:2020.1273
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doi:10.3390/pr8080999
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Dec 22, 2020
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CC BY 4.0
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[v1] (Original Submission)
Dec 22, 2020
 
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Dec 22, 2020
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https://psecommunity.org/LAPSE:2020.1273
 
Original Submitter
Calvin Tsay
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