Prevalence of the sling effect for enhancing collision rates in turbulent suspensions

Abstract

Turbulence facilitates collisions between particles suspended in a turbulent flow. Two effects have been proposed which can enhance the collision rate at high turbulence intensities: 'preferential concentration' (a clustering phenomenon) and the 'sling effect' (arising from the formation of caustic folds in the phase-space of the suspended particles). We have determined numerically the collision rate of small heavy particles as a function of their size and densities. The dependence on particle densities reveals that the enhancement by turbulence of the collision rate of particles with significant inertia is due almost entirely to the sling effect.

5 pages, 4 figures

References in corpus (9)

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Cited by in corpus (29)

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• Multiscale fluid--particle thermal interaction in isotropic turbulence
• Effect of turbulence on collisional growth of cloud droplets
• Flow structures govern particle collisions in turbulence
• Bubble-particle collisions in turbulence: insights from point-particle simulations
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• Relative velocities in bi-disperse turbulent aerosols: simulations and theory
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• Inertial particles distribute in turbulence as Poissonian points with random intensity inducing clustering and supervoiding
• Quantitative prediction of sling events in turbulence at high Reynolds numbers
• Collision rate for suspensions at large Stokes numbers - comparing Navier-Stokes and synthetic turbulence
• Caustics in turbulent aerosols form along the Vieillefosse line at weak particle inertia
• Rate of formation of caustics in heavy particles advected by turbulence
• Coagulation of inertial particles in supersonic turbulence
• Heavy particles in a persistent random flow with traps
• The effect of gravity on bubble-particle collisions in turbulence
• Convective Ripening and Initiation of Rainfall
• Fractal dimensions and trajectory crossings in correlated random walks
• Polydisperse collision kernels in droplet-laden turbulence with implications for rain formation
• Effects of correlated collisions and intermittency on the growth of lucky droplets