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Bubble behaviour in a horizontal high-speed solid-body rotating flow

Published online by Cambridge University Press:  27 August 2021

Majid Rodgar ,
Hélène Scolan ,
Jean-Louis Marié ,
Delphine Doppler  and
Jean-Philippe Matas Open the ORCID record for Jean-Philippe Matas [Opens in a new window]
Majid Rodgar
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, Univ Claude Bernard Lyon 1, CNRS, INSA Lyon, LMFA, UMR5509, 69130, Ecully, France
Hélène Scolan
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, Univ Claude Bernard Lyon 1, CNRS, INSA Lyon, LMFA, UMR5509, 69130, Ecully, France
Jean-Louis Marié*
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, Univ Claude Bernard Lyon 1, CNRS, INSA Lyon, LMFA, UMR5509, 69130, Ecully, France
Delphine Doppler
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, Univ Claude Bernard Lyon 1, CNRS, INSA Lyon, LMFA, UMR5509, 69130, Ecully, France
Jean-Philippe Matas
Affiliation:
Univ Lyon, Ecole Centrale de Lyon, Univ Claude Bernard Lyon 1, CNRS, INSA Lyon, LMFA, UMR5509, 69130, Ecully, France
*
†Email address for correspondence: [email protected]
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Abstract

We study experimentally the behaviour of a bubble injected into a horizontal liquid solid-body rotating flow, in a range of rotational velocities where the bubble is close to the axis of rotation. We first study the stretching of the bubble as a function of its size and of the rotation of the cell. We show that the bubble aspect ratio can be predicted as a function of the bubble Weber number by the model of Rosenthal (J. Fluid Mech., vol. 12, 1962, 358–366) provided an appropriate correction due to the impact of buoyancy is included. We next deduce the drag and lift coefficients from the mean bubble position. For large bubbles straddling the axis of rotation, we show that the drag coefficient $C_D$ is solely dependent on the Rossby number $Ro$, with $C_D \approx 1.5/Ro$. In the same limit of large bubbles, we show that the lift coefficient $C_L$ is controlled by the shear Reynolds number $Re_{shear}$ at the scale of the bubble. For $Re_{shear}$ larger than 3000 we observe a sharp transition, wherein large fluctuations in the bubble aspect ratio and mean position occur, and can lead to the break-up of the bubble. We interpret this regime as a resonance between the periodic forcing of the rotating cell and the eigenmodes of the stretched bubble.

JFM classification

Drops and Bubbles: Bubble dynamics Drops and Bubbles: Breakup/coalescence
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 925 , 25 October 2021 , A34
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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