Volume 87, Number 5, September 2009
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 September 2009|
Oscillatory instability of interacting grains in a turbulent flow
Laboratoire de Physique Statistique, Ecole Normale Supérieure, CNRS UMR 8550 - 24 rue Lhomond, 75005 Paris, France, EU
Accepted: 24 August 2009
We present an instability occuring in a turbulent flow containing grains that interact via a dipole-dipole force. Above a critical intensity of the interaction, the local density of grains displays a noisy oscillation. This instability takes place in a spatially and temporally fluctuating medium. We identify the control parameter of the instability and study the statistical properties of the local density. In spite of the turbulent fluctuations, measurements performed at different positions show that a spatially coherent mode is generated.
PACS: 45.70.Mg – Granular flow: mixing, segregation and stratification / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.45.-a – Nonlinear dynamics and chaos
© EPLA, 2009
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