Loose packings of frictional spheres

被引：72

作者：

Farrell, Greg R. ^{[1
]}

Martini, K. Michael ^{[1
]}

Menon, Narayanan ^{[1
]}

机构：

[1] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

来源：

SOFT MATTER | 2010年 / 6卷 / 13期

基金：

美国国家科学基金会;

关键词：

RANDOM CLOSE PACKING; DENSITY;

D O I：

10.1039/c0sm00038h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have produced loose packings of cohesionless, frictional spheres by sequential deposition of highly-spherical, monodisperse particles through a fluid. By varying the properties of the fluid and the particles, we have identified the Stokes number (St)-rather than the buoyancy of the particles in the fluid-as the parameter controlling the approach to the loose packing limit. The loose packing limit is attained at a threshold value of St at which the kinetic energy of a particle impinging on the packing is fully dissipated by the fluid. Thus, for cohesionless particles, the dynamics of the deposition process, rather than the stability of the static packing, defines the random loose packing limit. We have made direct measurements of the interparticle friction in the fluid, and present an experimental measurement of the loose packing volume fraction, phi(RLP), as a function of the friction coefficient mu(s).

引用

页码：2925 / 2930

页数：6

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