Volume 60, Number 6, December 2002
|Page(s)||931 - 937|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2002|
Granular gravitational collapse and chute flow
ExxonMobil Research and Engineering - 1545 Route 22 East Annandale, NJ 08801,
Corresponding author: email@example.com
Accepted: 3 October 2002
We argue that inelastic grains in a flow under gravitation tend to collapse into states in which the relative normal velocities of two neighboring grains is zero. If the time scale for this gravitational collapse is shorter than inverse strain rates in the flow, we propose that this collapse will lead to the formation of “granular eddies”, large-scale condensed structures of particles moving coherently with one another. The scale of these eddies is determined by the gradient of the strain rate. Applying these concepts to chute flow of granular media (gravitationally driven flow down inclined planes), we predict the existence of a bulk flow region whose rheology is determined only by flow density. This theory yields the “Pouliquen flow rule”, correlating different chute flows; it also accounts for the different flow regimes observed.
PACS: 81.05.Rm – Porous materials; granular materials / 47.50.+d – Non-Newtonian fluid flows / 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening)
© EDP Sciences, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.