Dynamics and stress in gravity-driven granular flow

Citation
C. Denniston et H. Li, Dynamics and stress in gravity-driven granular flow, PHYS REV E, 59(3), 1999, pp. 3289-3292
Citations number
16
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW E
ISSN journal
1063651X → ACNP
Volume
59
Issue
3
Year of publication
1999
Part
B
Pages
3289 - 3292
Database
ISI
SICI code
1063-651X(199903)59:3<3289:DASIGG>2.0.ZU;2-0
Abstract
We study, using simulations, the steady-state flow of dry sand driven by gr avity in two dimensions. An investigation of the microscopic grain dynamics reveals that grains remain separated but with a power-law distribution of distances and times between collisions. While there are large random grain velocities, many of these fluctuations are correlated across the system and local rearrangements are very slow. Stresses in the system are almost enti rely transfered by collisions and the structure of the stress tensor comes almost entirely from a bias in the directions in which collisions occur. [S 1063-651X(99)14903-1].