COMPACTION AND DENSITY FLUCTUATIONS IN VIBRATED GRANULAR MEDIA
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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.
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1969 ◽
Vol 37
(4)
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pp. 689-699
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1988 ◽
Vol 66
(5-6)
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pp. 325-328
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1998 ◽
Vol 39
(1)
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pp. 1-11
2013 ◽
Vol 50
(3)
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pp. 612-631
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2010 ◽
Vol 114
(2)
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pp. 704-714
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