Two-way interaction between isotropic turbulence and dispersed bubbles

Two-way interaction-mediated modification of isotropic turbulence and bubble dispersion is investigated using direct numerical simulations. The asymmetric coupling force on vortical structures generates horizontal force gradients, transiently enhancing the flow vorticity, while the cumulative buoyan...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2021, 35(4), , pp.1527-1537
Main Authors: Shim, Hyoeun, Lee, Changhoon
Format: Article
Language:English
Subjects:
Attenuation
Bubbles
Computational fluid dynamics
Control
Coupling
Direct numerical simulation
Dispersion
Dynamical Systems
Energy dissipation
Engineering
Flow velocity
Industrial and Production Engineering
Isotropic turbulence
Mechanical Engineering
Original Article
Vibration
Vorticity
기계공학
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Summary:Two-way interaction-mediated modification of isotropic turbulence and bubble dispersion is investigated using direct numerical simulations. The asymmetric coupling force on vortical structures generates horizontal force gradients, transiently enhancing the flow vorticity, while the cumulative buoyant transfer induced by bubbles in the downflow regions decreases it by attenuating the horizontal gradients of the downward flow velocity. These vorticity fluctuations affect the non-uniform distortion in the flow dissipation spectrum with a large-scale energy reduction, decreasing the flow dissipation. In addition, the buoyancy force acting on the bubbles affects the bubble distribution. Smaller inhomogeneities in the bubble distribution with turbulence attenuation, owing to the two-way coupling effects, also contribute to the bubble dispersion.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-021-0317-6