COMPACTION AND DENSITY FLUCTUATIONS IN VIBRATED GRANULAR MEDIA

A. C. B. Barnum, Arif Ozbay and E. R. Nowak ()
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A. C. B. Barnum: Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
Arif Ozbay: Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
E. R. Nowak: Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA

Advances in Complex Systems (ACS), 2001, vol. 04, issue 04, 389-396

Abstract: 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.

Keywords: Granular compaction; packing; noise; nonlinear dynamics; nonequilibrium thermodynamics (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1142/S0219525901000243

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