Europhys. Lett.
Volume 74, Number 5, June 2006
Page(s) 830 - 836
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 10 May 2006
Europhys. Lett., 74 (5), pp. 830-836 (2006)
DOI: 10.1209/epl/i2005-10589-8

Collision statistics in a dilute granular gas fluidized by vibrations in low gravity

E. Falcon1, S. Aumaître2, P. Évesque3, F. Palencia4, C. Lecoutre-Chabot4, S. Fauve2, D. Beysens4 and Y. Garrabos4

1  Laboratoire de Physique, ENS Lyon, UMR 5672 CNRS 46 allée d'Italie, 69007 Lyon, France
2  LPS, ENS Paris, UMR 8550 CNRS - 24 rue Lhomond, 75005 Paris, France
3  Laboratoire MSSMat, École Centrale Paris, UMR 8579 CNRS 92295 Chatenay-Malabry, France
4  ESEME-CEA-CNRS, ICMCB, 87 av. Schweitzer, Université Bordeaux 1 33608 Pessac Cedex, France

received 28 October 2005; accepted in final form 11 April 2006
published online 10 May 2006

We report an experimental study of a dilute "gas" of inelastically colliding particles excited by vibrations in low gravity. We show that recording the collision frequency together with the impulses on a wall of the container gives access to several quantities of interest. We observe that the mean collision frequency does not scale linearly with the number N of particles in the container. This is due to the dissipative nature of the collisions and is also directly related to the non-extensive behaviour of the kinetic energy (the granular temperature is not intensive).

45.70.-n - Granular systems.
81.70.Ha - Testing in microgravity environments.
45.50.-j - Dynamics and kinematics of a particle and a system of particles.

© EDP Sciences 2006