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Title: Multifractal intermittency in granular flow through bottlenecks
Author: Gella, D.
Zuriguel, Iker
Ortín, Jordi, 1959-
Keywords: Materials granulars
Física estadística
Granular materials
Statistical physics
Issue Date: 22-Nov-2019
Publisher: American Physical Society
Abstract: We experimentally analyze the intermittent nature of granular silo flow when the discharge is controlled by an extracting belt at the bottom. We discover the existence of four different scenarios. For low extraction rates, the system is characterized by an on-off intermittency. When the extraction rate is increased the structure functions of the grains velocity increments, calculated for different lag times, reveal the emergence of multifractal intermittency. Finally, for very high extraction rates that approach the purely gravitational discharge, we observe that the dynamics become dependent on the outlet size. For large orifices the behavior is monofractal, whereas for small ones, the fluctuations of the velocity increments deviate from Gaussianity even for very large time lags.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2019, vol. 123, num. 21, p. 218004
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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