Injected power and entropy flow in a heated granular gas

Paolo Visco (1, 2) , Andrea Puglisi (1) , Alain Barrat (1) , Emmanuel Trizac (2) , Frédéric van Wijland (1, 3)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]
2 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques
3 MSC - Matière et Systèmes Complexes

Our interest goes to the power injected in a heated granular gas and to the possibility to interpret it in terms of entropy flow. We numerically determine the distribution of the injected power by means of Monte-Carlo simulations. Then, we provide a kinetic theory approach to the computation of such a distribution function. Finally, after showing why the injected power does not satisfy a Fluctuation Relation a la Gallavotti-Cohen, we put forward a new quantity which does fulfill such a relation, and is not only applicable in a variety of frameworks outside the granular world, but also experimentally accessible.

Domaines: Mécanique statistique [cond-mat.stat-mech]

Paolo Visco, Andrea Puglisi, Alain Barrat, Emmanuel Trizac, Frédéric van Wijland. Injected power and entropy flow in a heated granular gas. EPL - Europhysics Letters, 2005, 72 (1), pp.55-61. ⟨10.1209/epl/i2005-10213-1⟩. ⟨hal-00009051⟩