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DYNAMICS OF LARGE PARTICLES IN A VON KÁRMÁN SWIRLING FLOW

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We study the dynamics of large particles in a turbulent von Kármán swirling flow, tracking the particles in the whole volume. We observe a transition with increasing particle diameter in the dynamics from homogeneous toward inhomogeneous sampling of the apparatus. Large particles tend to avoid the center of the flow, an effect almost insensitive to the Reynolds number or inertia of the par- ticles. Studying the Lagrangian position power spectrum, we observe three distinct regimes. The observed slopes can be qualitatively understood in the framework of Brownian motion in a double well potential.

Author(s):

Nathanaël Machicoane    
Laboratoire de Physique, École Normale Supérieure Lyon
France

Lionel Fiabane    
Laboratoire de Physique, École Normale Supérieure Lyon
France

Robert Zimmermann    
Laboratoire de Physique, École Normale Supérieure Lyon
France

Jean-François Pinton    
Laboratoire de Physique, École Normale Supérieure Lyon
France

Mickael Bourgoin    
Laboratoire des Écoulements Géophysiques et Industriels
France

Romain Volk    
Laboratoire de Physique, École Normale Supérieure Lyon
France