Core precession and global modes in granular bulk flow

被引：53

作者：

Fenistein, D ^{[1
]}

van de Meent, JW ^{[1
]}

van Hecke, M ^{[1
]}

机构：

[1] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.96.118001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a novel transition to core precession for granular flows in a split-bottomed shear cell. This transition is related to a qualitative change in the 3D flow structure: For shallow layers of granular material, the shear zones emanating from the split reach the free surface, while for deep layers the shear zones meet below the surface, causing precession. The surface velocities reflect this transition by a change of symmetry. As a function of layer depth, we find that three qualitatively different smooth and robust granular flows can be created in this simple shearing geometry.

引用

页数：4

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