Les vibrations induisent des gradients de vitesse dans un milieu où la densité est inhomogène. L'absence d'accélération terrestre simplifie les nombreux comportements qui en découlent. Ainsi, dans les milieux granulaires, une paroi vibrante thermalise par choc les particules. Suivant la densité volumique de celles-ci, on peut observer une résonance à une particule, un gaz (de Knudsen), des clusters « solides ». Dans les milieux fluides, et plus particulièrement près d'un point critique liquide–vapeur, des vibrations de « haute fréquence » peuvent induire des écoulements moyens à grande échelle, sous gradient thermique ou lors d'une transition liquide–solide ou liquide–gaz.
Vibrations induce velocity gradients in a density-inhomogeneous medium. The absence of earth gravity simplifies the various behaviors resulting from this situation. In granular media, a vibrating wall thermalizes the particles by means of collisions. According to the particle density, various behaviours can be observed: resonance with a single particle, (Knudsen) gas, ‘solid’ clusters. In fluids, quite interesting phenomena are related with ‘high frequency’ vibrations. Large-scale mean flows appear, which can generate various phenomena, especially near a liquid–vapour critical point: thermovibrational convection, modifications of the dynamics of liquid–solid or liquid–gas transitions.
Keywords: Granular media, Vibrational phenomena, Liquid–gas critical point
@article{CRMECA_2004__332_5-6_457_0,
author = {Daniel Beysens},
title = {L'effet des vibrations sur la mati\`ere inhomog\`ene : quelques \'etudes en apesanteur},
journal = {Comptes Rendus. M\'ecanique},
pages = {457--465},
publisher = {Elsevier},
volume = {332},
number = {5-6},
year = {2004},
doi = {10.1016/j.crme.2004.02.016},
language = {fr},
}
Daniel Beysens. L'effet des vibrations sur la matière inhomogène : quelques études en apesanteur. Comptes Rendus. Mécanique, Volume 332 (2004) no. 5-6, pp. 457-465. doi : 10.1016/j.crme.2004.02.016. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.02.016/
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