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Liquid velocity fluctuations and energy spectra in three-dimensional buoyancy-driven bubbly flows
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Liquid velocity fluctuations and energy spectra in three-dimensional buoyancy-driven bubbly flows
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Journal Article
Liquid velocity fluctuations and energy spectra in three-dimensional buoyancy-driven bubbly flows
2020
Overview
We present a direct numerical simulation (DNS) study of pseudo-turbulence in buoyancy-driven bubbly flows for a range of Reynolds ($150\\leqslant Re\\leqslant 546$) and Atwood ($0.04\\leqslant At\\leqslant 0.9$) numbers. We study the probability distribution function of the horizontal and vertical liquid velocity fluctuations and find them to be in quantitative agreement with the experiments. The energy spectrum shows a$k^{-3}$scaling at high$Re$and becomes steeper on reducing$Re$. To investigate spectral transfers in the flow, we derive the scale-by-scale energy budget equation. Our analysis shows that, for scales smaller than the bubble diameter, the net transfer because of the surface tension and the kinetic energy flux balances viscous dissipation to give$k^{-3}$scaling of the energy spectrum for both low and high$At$.
Publisher
Cambridge University Press
Subject
