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Journal Articles Chemical Engineering Research and Design Year : 2022

Effects of liquid viscosity and bubble size distribution on bubble plume hydrodynamics

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1
Claude Le Men
Arnaud Cockx
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  • PersonId : 1178972
Alain Liné

Abstract

The present paper provides a complete databank of bubble plume hydrodynamics in various media characterized by different viscosities in the range 1-100 mPa.s. Thus, the influence of the viscosity on bubble plume oscillations and on both liquid and gas velocity fields is studied. The role of the bubble size distribution at different viscosities was also analysed by using two different spargers: a membrane to create ellipsoidal millimetrice bubbles and a slugflow tube to create spherical cap bubbles. Mean velocity profiles, averaged over a large number of plume oscillation periods and corresponding root mean square profiles are discussed, in both phases. Furthermore, void fraction profiles, plume oscillation periods, and bubble size distributions are given for all experimental conditions. Finally, probability density functions and phase averaged profiles in the liquid phase provide additional information. The dependence of bubble plume hydrodynamics on liquid viscosity is huge. At large viscosity, the oscillating plume is damped, regardless of the sparger. Concerning the membrane sparger the viscosity increase modifies the plume oscillation period and its lateral plume expansion, whereas, in the case of the slugflow sparger, only the plume expansion is impacted. Liquid phase hyrdodynamics are weakly affected by the choice of sparger, especially at high viscosities.

Dates and versions

hal-03699127 , version 1 (20-06-2022)

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David Laupsien, Claude Le Men, Arnaud Cockx, Alain Liné. Effects of liquid viscosity and bubble size distribution on bubble plume hydrodynamics. Chemical Engineering Research and Design, 2022, 180, pp.451-469. ⟨10.1016/j.cherd.2021.09.025⟩. ⟨hal-03699127⟩
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