VILQUIN, Alexandre; BOUDET, J. F.; KELLAY, H.

doi:10.1103/PhysRevE.94.022905

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VILQUIN, Alexandre
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

BOUDET, J. F.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

KELLAY, H.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Physical Review E. 2016-08, vol. 94, n° 2, p. 022905 (1-14)

American Physical Society (APS)

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Velocity distributions in normal shock waves obtained in dilute granular flows are studied. These distributions cannot be described by a simple functional shape and are believed to be bimodal. Our results show that these distributions are not strictly bimodal but a trimodal distribution is shown to be sufficient. The usual Mott-Smith bimodal description of these distributions, developed for molecular gases, and based on the coexistence of two subpopulations (a supersonic and a subsonic population) in the shock front, can be modified by adding a third subpopulation. Our experiments show that this additional population results from collisions between the supersonic and subsonic subpopulations. We propose a simple approach incorporating the role of this third intermediate population to model the measured probability distributions and apply it to granular shocks as well as shocks in molecular gases.< Réduire

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Structure of velocity distributions in shock waves in granular gases with extension to molecular gases

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