Mass transfer in the wake of non-spherical air bubbles quantified by quenching of fluorescence
Jimenez, M. and Dietrich, N. and Hébrard, G. (2013) Mass transfer in the wake of non-spherical air bubbles quantified by quenching of fluorescence. Chemical Engineering Science, 100. pp. 160-171. ISSN 0009-2509 (https://doi.org/10.1016/j.ces.2013.01.036)
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Abstract
Based on planar laser induced fluorescence with inhibition (PLIFI) experiments, the mass transfer behavior in the wake of single rising air bubbles is investigated. Bubbles of equivalent diameters ranging from 0.90 to 2.24. mm are studied, exhibiting vertical and zigzagging paths when they rise in the liquid. The transferred mass in the wake of such bubbles, considered as spherical or oblate ellipsoids, is directly visualized and represented in three dimensions for some cases. A specific image processing and mathematical approach are proposed to accurately quantify the mass transfer rate by estimating the liquid side mass transfer coefficient and flux density. After a comparison of liquid side mass transfer coefficients with values of the literature, this approach is tested to evaluate first the influence of bubble diameters and that of the liquid composition on the mass transfer. Liquid media with small amount of salt, glucose and glycerol, inducing surface tension and/or viscosity changes, are considered. A significant decrease in the mass transfer efficiencies, down to 88% depending in the added component, is observed and analyzed for these different liquids.
ORCID iDs
Jimenez, M. ORCID: https://orcid.org/0000-0002-4631-0608, Dietrich, N. and Hébrard, G.;-
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Item type: Article ID code: 90163 Dates: DateEvent30 August 2013Published31 January 2013Published Online17 January 2013AcceptedSubjects: Technology > Chemical engineering Department: Faculty of Engineering > Biomedical Engineering Depositing user: Pure Administrator Date deposited: 07 Aug 2024 10:54 Last modified: 13 Oct 2024 00:53 URI: https://strathprints.strath.ac.uk/id/eprint/90163