COMPACTION AND DENSITY FLUCTUATIONS IN VIBRATED GRANULAR MEDIA
We report measurements of the density of a vibrated granular material as a function of time or taps. The material studied consists of monodisperse spherical glass beads confined to a long, thin cylindrical tube. Changes in vibration intensity are used to induce transitions between two steady state densities that depend on the intensity of the vibrations. We find a complex time evolution similar to previous work on the irreversible relaxation from a loose state toward a steady state. In addition, frequency dependent third order moments of the density fluctuations are measured. The data indicate a coupling between large variations in density on one time scale and noise power over a broad range of higher-frequency scales.
Year of publication: |
2001
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Authors: | BARNUM, A. C. B. ; OZBAY, ARIF ; NOWAK, E. R. |
Published in: |
Advances in Complex Systems (ACS). - World Scientific Publishing Co. Pte. Ltd., ISSN 1793-6802. - Vol. 04.2001, 04, p. 389-396
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Publisher: |
World Scientific Publishing Co. Pte. Ltd. |
Subject: | Granular compaction | packing | noise | nonlinear dynamics | nonequilibrium thermodynamics |
Saved in:
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