From single bubble to global mixing: Added mass, drift, wake

Energy field of spherical-cap bubble. [Display omitted] •Three multiphase phenomena analysed: added mass, drift, wake.•These micro-scale events produce large-scale transport and mixing.•The spherical-cap bubble was used as the object for demonstration. The goal was to present an approach where the m...

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Bibliographic Details
Published in:Chemical engineering research & design 2021-08, Vol.172, p.280-290
Main Authors: Ruzicka, M.C., Puncochar, M., Simcik, M.
Format: Article
Language:English
Subjects:
Acceleration
Added mass effects
Bubbles
Cap bubble
Drift
Estimating techniques
Kinematics
Kinetics
Large-scale circulation
Mixing
Particle motion
Small-scale motion
Spherical caps
Studies
Transport phenomena
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Summary:Energy field of spherical-cap bubble. [Display omitted] •Three multiphase phenomena analysed: added mass, drift, wake.•These micro-scale events produce large-scale transport and mixing.•The spherical-cap bubble was used as the object for demonstration. The goal was to present an approach where the micro-scale events related to single-particle motion directly translate onto higher levels and produce large-scale observable phenomena related to transport and mixing. Three multiphase hydrodynamic effects were considered, analysed and discussed: added mass, drift, wake. Although the results are of general validity, the spherical-cap shape (cap bubble) was used as the definite object for demonstration. It was shown how the unsteady inertial effect of added mass (coefficient C), irrelevant for mixing, is related to the steady kinematic concept of Darwin drift (coefficient D) that is directly associated with mixing. It was shown how the inviscid drift and the viscous wake operate and contribute to the resulting circulation and mixing. List of currently available formulas for C was completed, which are usable for estimation of D.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2021.06.015