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Granular avalanches: Deterministic, correlated and decorrelated dynamics


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Author: Sánchez Quintanilla, Miguel Angel
Castellanos Mata, Antonio
Valverde Millán, José Manuel
Department: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Date: 2004-12-15
Published in: Europhysics Letters, 68 (6), 818-824.
Document type: Article
Abstract: A statistical analysis of granular avalanches in a half-filled and slowly rotated drum is presented. For large-sized grains the classical coherent oscillation is reproduced, i.e. we observe a quasi-periodic succession of regularly sized avalanches. As particle size is decreased, we see a crossover to a new complex dynamics characterized by long-range time correlations of local avalanches without a typical size, although the size distribution is not scale invariant. In the limit of large values of the time lag avalanches turn gradually to be decorrelated. The trend observed in the system dynamics as particle size is decreased is ascribed to the increase of cohesiveness which promotes bulk disorder. We argue that our experimental findings can be qualitatively predicted by theoretical models with adjustable parameters such as unquenched disorder, random critical slope, fluidization length, inertia and dissipation.
Cite: Sánchez Quintanilla, M.A., Castellanos Mata, A. y Valverde Millán, J.M. (2004). Granular avalanches: Deterministic, correlated and decorrelated dynamics. Europhysics Letters, 68 (6), 818-824.
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DOI: 10.1209/epl/i2004-10283-5

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