Hierarchically related processes and macroscopic emergence of fluctuations in weakly perturbed granular media
We report an experiment where a torsion oscillator is forced to penetrate a granular system over a small distance as, and the angular deflection is continuously detected. From angular deflections time series we deduce the granular noise and obtain insights on the grain-level mechanisms. In particular, we identify a control parameter, as, on which the granular noise depends exponentially. At very low as, the granular noise follows a Vogel–Fulcher–Tammann glass-like law. We explain this dependence with the idea that the macroscopic granular dynamics, seen by the oscillator, is governed by the emergence of extreme mesoscopic fluctuations.
Year of publication: |
2003
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Authors: | D'Anna, Gianfranco ; Mayor, Patrick |
Published in: |
Physica A: Statistical Mechanics and its Applications. - Elsevier, ISSN 0378-4371. - Vol. 325.2003, 1, p. 267-273
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Publisher: |
Elsevier |
Subject: | Granular matter | Grain-level mechanisms | Glassy behavior | Extreme order statistics |
Saved in:
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