Eur. Phys. J. E (2015) 38: 8
https://doi.org/10.1140/epje/i2015-15008-5

Regular Article

Translational and rotational temperatures of a 2D vibrated granular gas in microgravity

¹ LPMC UMR6622, University of Nice, Parc Valrose, 06108, Nice Cedex 2, France
² SKEMA Bachelors, 60 rue Dostoievski, BP085, 06902, Sophia Antipolis, France

^* e-mail: yan.grasselli@skema.edu

Received: 24 July 2014
Revised: 6 November 2014
Accepted: 19 January 2015
Published online: 18 February 2015

Abstract

We present an experimental study performed on a vibrated granular gas enclosed into a 2D rectangular cell. Experiments are performed in microgravity conditions achieved during parabolic flights. High speed video recording and optical tracking allow to obtain the full kinematics (translation and rotation) of the particles. The inelastic parameters are retrieved from the experimental trajectories as well as the translational and rotational velocity distributions. We report that the experimental ratio of translational versus rotational temperature decreases with the density of the medium but increases with the driving velocity of the cell. These experimental results are compared with existing theories and we point out the differences observed. We also present a model which fairly predicts the equilibrium experimental temperatures along the direction of vibration.