Dans les milieux granulaires, la dissipation conduit à des phénomènes intéressants comme la formation d'amas dans des états dynamiques hors-équilibre. A titre d'exemple, nous examinons la perte d'énergie et l'évolution des amas avec le temps d'un système qui se refroidit librement. De plus, nous analysons la distribution de probabilité de la fréquence de collision. Dans un système homogène, la fréquence de collision d'événements non corrélés conduit à une distribution de Poisson, alors que les phénomènes coopératifs sont caractérisés par une probabilité de collision par unité de temps qui décroı̂t comme une loi de puissance.
In granular media, dissipation leads to interesting phenomena like cluster formation in non-equilibrium dynamical states. As an example, the freely cooling system is examined concerning the energy decay and the cluster evolution with time. Furthermore, the probability distribution of the collision frequency is discussed. Uncorrelated events lead to a Poisson distribution for the collision frequencies in the homogeneous system, whereas cooperative phenomena can be related to a power-law decay of the collision probability per unit time.
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Mots clés : refroidissement libre et inhomogène, phénomènes coopératifs, dynamique moléculaire gérée par les événements
Stefan Luding 1, 2
@article{CRPHYS_2002__3_2_153_0, author = {Stefan Luding}, title = {Structures and non-equilibrium dynamics in granular media}, journal = {Comptes Rendus. Physique}, pages = {153--161}, publisher = {Elsevier}, volume = {3}, number = {2}, year = {2002}, doi = {10.1016/S1631-0705(02)01308-7}, language = {en}, }
Stefan Luding. Structures and non-equilibrium dynamics in granular media. Comptes Rendus. Physique, Volume 3 (2002) no. 2, pp. 153-161. doi : 10.1016/S1631-0705(02)01308-7. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/S1631-0705(02)01308-7/
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