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Lift and drag coefficients of deformable bubbles in intense turbulence determined from bubble rise velocity

Published online by Cambridge University Press:  05 May 2020

Ashwanth K. R. Salibindla ,
Ashik Ullah Mohammad Masuk ,
Shiyong Tan  and
Rui Ni Open the ORCID record for Rui Ni [Opens in a new window]
Ashwanth K. R. Salibindla
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD21210, USA
Ashik Ullah Mohammad Masuk
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD21210, USA
Shiyong Tan
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD21210, USA
Rui Ni*
Affiliation:
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD21210, USA
*
†Email address for correspondence: [email protected]
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Abstract

We experimentally investigate the rise velocity of finite-sized bubbles in turbulence with a high energy dissipation rate of $\unicode[STIX]{x1D716}\gtrsim 0.5~\text{m}^{2}~\text{s}^{-3}$. In contrast to a 30–40 % reduction in rise velocity previously reported in weak turbulence (the Weber number ($We$) is much smaller than the Eötvös number ($Eo$); $We\ll 1<Eo$), the bubble rise velocity in intense turbulence shows a surprising new behaviour: an abrupt transition from an order of magnitude slower to a factor of two faster than rising in an otherwise quiescent medium. This transition occurs when $We$ increases from below one to above one, underscoring the key role played by the turbulence-induced deformation. We also formulate a model based on bubble–eddy coupling, and the results show an excellent agreement with not only our data in intense turbulence but also other works on weak turbulence. The model also helps us to extract the lift and drag coefficients of bubbles in intense turbulence for a wide range of $We$ and Reynolds numbers in situ.

JFM classification

Drops and Bubbles: Bubble dynamics Multiphase and Particle-laden Flows: Multiphase flow Turbulent Flows: Isotropic turbulence
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 894 , 10 July 2020 , A20
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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