Large-scale clustering of light small particles in developed turbulence

Small solid particles, droplets, and bubbles can form clusters in turbulent flows by the action of coherent vortices. This phenomenon, sometimes called the preferential concentration, was often thought to be most conspicuous when the velocity relaxation time τp of particles is comparable with the Ko...

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Bibliographic Details
Published inPhysics of fluids (1994) Vol. 33; no. 3
Main Authors Oka, Sunao, Watanabe, Daiki, Goto, Susumu
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.03.2021
Subjects
Clustering
Coherence
Computational fluid dynamics
Direct numerical simulation
Fluid dynamics
Fluid flow
High Reynolds number
Physics
Relaxation time
Reynolds number
Turbulence
Vortices
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Summary:Small solid particles, droplets, and bubbles can form clusters in turbulent flows by the action of coherent vortices. This phenomenon, sometimes called the preferential concentration, was often thought to be most conspicuous when the velocity relaxation time τp of particles is comparable with the Kolmogorov time τ η. However, since high-Reynolds number turbulence consists of coherent eddies with different timescales, particles can form clusters even when τ p ≫ τ η. We demonstrate, by direct numerical simulations, that light particles with different τp values form clusters around axes of coherent vortices with different sizes in developed turbulence.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0041873