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Turbulence modulation in buoyancy-driven bubbly flows

Published online by Cambridge University Press:  03 December 2021

Vikash Pandey Open the ORCID record for Vikash Pandey [Opens in a new window] ,
Dhrubaditya Mitra Open the ORCID record for Dhrubaditya Mitra [Opens in a new window]  and
Prasad Perlekar Open the ORCID record for Prasad Perlekar [Opens in a new window]
Vikash Pandey
Affiliation:
TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Gopanpally, Hyderabad 500046, India
Dhrubaditya Mitra
Affiliation:
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, 10691 Stockholm, Sweden
Prasad Perlekar*
Affiliation:
TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Gopanpally, Hyderabad 500046, India
*
†Email address for correspondence: perlekar@tifrh.res.in
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Abstract

We present a direct numerical simulation (DNS) study of buoyancy-driven bubbly flows in the presence of large-scale driving that generates turbulence. On increasing the turbulence intensity: (a) the bubble trajectories become more curved and (b) the average rise velocity of the bubbles decreases. We find that the energy spectrum of the flow shows a pseudo-turbulence scaling for length scales smaller than the bubble diameter and a Kolmogorov scaling for scales larger than the bubble diameter. We conduct a scale-by-scale energy budget analysis to understand the scaling behaviour observed in the spectrum. Although our bubbles are weakly buoyant, the statistical properties of our DNS are consistent with the experiments that investigate turbulence modulation by air bubbles in water.

JFM classification

Multiphase and Particle-laden Flows: Multiphase flow Turbulent Flows: Turbulence simulation Drops and Bubbles: Bubble dynamics

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Type
JFM Papers
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Journal of Fluid Mechanics , Volume 932 , 10 February 2022 , A19
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© The Author(s), 2021. Published by Cambridge University Press

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References

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