Sling Effect in Collisions of Water Droplets in Turbulent Clouds
- 1 December 2007
- journal article
- Published by American Meteorological Society in Journal of the Atmospheric Sciences
- Vol. 64 (12) , 4497-4505
Abstract
The effect of turbulence on the collision rate between droplets in clouds is investigated. Because of their inertia, water droplets can be shot out of curved streamlines of the turbulent airflow. The contribution of such a “sling effect” in the collision rate of the same-size water droplets is described and evaluated. It is shown that already for turbulence with the dissipation rate 103 cm2 s−3, the sling effect gives a contribution to the collision rate of 15-μm droplets comparable to that due to the local velocity gradient. That may explain why the formulas based on the local velocity gradient consistently underestimate the turbulent collision rate, even with the account of preferential concentration.Keywords
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This publication has 32 references indexed in Scilit:
- Advective collisionsEurophysics Letters, 2007
- Heavy Particle Concentration in Turbulence at Dissipative and Inertial ScalesPhysical Review Letters, 2007
- Clustering of aerosol particles in isotropic turbulenceJournal of Fluid Mechanics, 2005
- Collision Rates of Cloud Droplets in Turbulent FlowJournal of the Atmospheric Sciences, 2005
- Clustering and collisions of heavy particles in random smooth flowsPhysics of Fluids, 2005
- Coagulation of monodisperse aerosol particles by isotropic turbulencePhysics of Fluids, 2004
- Intermittent distribution of heavy particles in a turbulent flowPhysics of Fluids, 2004
- Acceleration of rain initiation by cloud turbulenceNature, 2002
- On the collision rate of particles in turbulent flow with gravityPhysics of Fluids, 2002
- Intermittent Distribution of Inertial Particles in Turbulent FlowsPhysical Review Letters, 2001