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Dynamics and mass transfer of rising bubbles in a homogenous swarm at large gas volume fraction

Published online by Cambridge University Press:  16 December 2014

Damien Colombet ,
Dominique Legendre ,
Frédéric Risso ,
Arnaud Cockx  and
Pascal Guiraud
Damien Colombet
Affiliation:
Institut de Mécanique des Fluides de Toulouse, CNRS and Université de Toulouse, Allée Camille Soula, 31400 Toulouse, France Université de Toulouse; INSA, UPS, INP; LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France CNRS, UMR5504, F-31400 Toulouse, France SOLVAY R&I – Rhodia, 85 Avenue des Frères Perret, BP 62, 69192 Saint Fons, France
Dominique Legendre*
Affiliation:
Institut de Mécanique des Fluides de Toulouse, CNRS and Université de Toulouse, Allée Camille Soula, 31400 Toulouse, France
Frédéric Risso
Affiliation:
Institut de Mécanique des Fluides de Toulouse, CNRS and Université de Toulouse, Allée Camille Soula, 31400 Toulouse, France
Arnaud Cockx
Affiliation:
Université de Toulouse; INSA, UPS, INP; LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France CNRS, UMR5504, F-31400 Toulouse, France
Pascal Guiraud
Affiliation:
Université de Toulouse; INSA, UPS, INP; LISBP, 135 Avenue de Rangueil, F-31077 Toulouse, France INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, F-31400 Toulouse, France CNRS, UMR5504, F-31400 Toulouse, France
*
†Email address for correspondence: legendre@imft.fr
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Abstract

The present work focuses on the collective effect on both bubble dynamics and mass transfer in a dense homogeneous bubble swarm for gas volume fractions ${\it\alpha}$ up to 30 %. The experimental investigation is carried out with air bubbles rising in a square column filled with water. Bubble size and shape are determined by means of a high-speed camera equipped with a telecentric lens. Gas volume fraction and bubble velocity are measured by using a dual-tip optical probe. The combination of these two techniques allows us to determine the interfacial area between the gas and the liquid. The transfer of oxygen from the bubbles to the water is measured from the time evolution of the concentration of oxygen dissolved in water, which is obtained by means of the gassing-out method. Concerning the bubble dynamics, the average vertical velocity is observed to decrease with ${\it\alpha}$ in agreement with previous experimental and numerical investigations, while the bubble agitation turns out to be weakly dependent on ${\it\alpha}$. Concerning mass transfer, the Sherwood number is found to be very close to that of a single bubble rising at the same Reynolds number, provided the latter is based on the average vertical bubble velocity, which accounts for the effect of the gas volume fraction on the bubble rise velocity. This conclusion is valid for situations where the diffusion coefficient of the gas in the liquid is very low (high Péclet number) and the dissolved gas is well mixed at the scale of the bubble. It is understood by considering that the transfer occurs at the front part of the bubbles through a diffusion layer which is very thin compared with all flow length scales and where the flow remains similar to that of a single rising bubble.

JFM classification

Drops and Bubbles: Bubble dynamics Drops and Bubbles: Drops and Bubbles
Type
Papers
Information
Journal of Fluid Mechanics , Volume 763 , 25 January 2015 , pp. 254 - 285
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Copyright
© 2014 Cambridge University Press 

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Footnotes

‡

Present address: LEGI, Energetic Team, Joseph Fourier University, Grenoble, France.

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