Velocity statistics in excited granular media.

Losert, W.; Cooper, D. G. W.; Delour, J.; Kudrolli, A.; Gollub, J. P.

Losert, W.; Cooper, D. G. W.; Delour, J.; Kudrolli, A.; Gollub, J. P..

Afiliación

Losert W; Department of Physics, Haverford College, Haverford, Pennsylvania 19041.

Chaos ; 9(3): 682-690, 1999 Sep.

Article en En | MEDLINE | ID: mdl-12779864

RESUMEN

We present an experimental study of velocity statistics for a partial layer of inelastic colliding beads driven by a vertically oscillating boundary. Over a wide range of parameters (accelerations 3-8 times the gravitational acceleration), the probability distribution P(v) deviates measurably from a Gaussian for the two horizontal velocity components. It can be described by P(v) approximately exp(-mid R:v/v(c)mid R:(1.5)), in agreement with a recent theory. The characteristic velocity v(c) is proportional to the peak velocity of the boundary. The granular temperature, defined as the mean square particle velocity, varies with particle density and exhibits a maximum at intermediate densities. On the other hand, for free cooling in the absence of excitation, we find an exponential velocity distribution. Finally, we examine the sharing of energy between particles of different mass. The more massive particles are found to have greater kinetic energy. (c) 1999 American Institute of Physics.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Chaos Asunto de la revista: CIENCIA Año: 1999 Tipo del documento: Article Pais de publicación: Estados Unidos

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