Landau Days 2015
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Landau Days 2015
June, 22-25
Chernogolovka, Russia
 
   

Localization-delocalization transition in the distribution of inertial particles in wall-bounded random flows
Date/Time: 10:10 24-Jun-2015
Abstract:
Turbophoresis is the tendency of dispersed particles to migrate in the direction of minima of turbulence intensity (say, a wall). It was recently suggested that the sign of turbophoresis can be actually opposite, so that particles agitated by turbulent fluid fluctuations go away from minima of fluctuations intensity if they are inertial enough. That means localization-delocalization transition upon the change of inertia: particles with small inertia concentrate in the minimum of turbulence, while sufficiently inertial particles escape to infinity. We consider the motion of dispersed inertial particles in wall-bounded random flow in the case of inelastic particle-wall collisions. The phase diagram for the transition in the inertia-elasticity plane is found. If the restitution coefficient of particle velocity is smaller than some critical value, then the inelastic collapse occurs: the particles are localized near the wall for any inertia. The theoretical predictions are in a good agreement with the results of direct numerical simulations.



Authors
Belan Sergey Alexandrovich (Presenter)
(no additional information)

 
 
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