Mobility of a sphere in vibrated granular media

O. Zik, J. Stavans, Y. Rabin

Research output: Contribution to journalLetterpeer-review

85 Scopus citations


We report the results of the first measurements of the mobility/friction coefficients of a sphere dragged horizontally through a vertically vibrated granular medium. The friction coefficient depends on the state of excitation of the medium and drops rapidly when the acceleration of the vibrated cell exceeds that of gravity. We propose a simple model involving fluidization/solidification events during a period of vibration of the cell. We argue that the observed mobility is proportional to the fraction of the time spent in the «fluid» state and discuss the origin of the observed dependence on the various parameters.

Original languageEnglish
Pages (from-to)315-319
Number of pages5
Issue number4
StatePublished - 21 Jan 1992


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