MOBILITY OF A SPHERE IN VIBRATED GRANULAR MEDIA

被引：86

作者：

ZIK, O ^{[1
]}

STAVANS, J ^{[1
]}

RABIN, Y ^{[1
]}

机构：

[1] BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL

来源：

EUROPHYSICS LETTERS | 1992年 / 17卷 / 04期

关键词：

MECHANICS OF DISCRETE SYSTEMS; MECHANICAL PROPERTIES OF SOLIDS (RELATED TO MICROSCOPIC STRUCTURE); DISPERSE SYSTEMS;

D O I：

10.1209/0295-5075/17/4/006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：315 / 319

页数：5

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