Numéro
J. Phys. I France
Volume 4, Numéro 8, August 1994
Page(s) 1161 - 1172
DOI https://doi.org/10.1051/jp1:1994246
DOI: 10.1051/jp1:1994246
J. Phys. I France 4 (1994) 1161-1172

Different characteristics of the motion of a single particle on a bumpy inclined line

Gerald H. Ristow, François-Xavier Riguidel and Daniel Bideau

Groupe Matière Condensée et Matériaux, Université de Rennes I, 35042 Rennes Cedex, France


(Received 18 January 1994, revised 24 March 1994, accepted 15 April 1994)

Abstract
In order to better understand the yole of friction and disorder in segregation mechanism in surface flow, we investigate the motion of a single ball of radius R on a onedimensional bumpy line made of balls of radius r. The smoothness is then controlled by R/r, the ratio of radii. In addition to experimental results for different ratios, we perform numerical simulations where the bumpiness - disorder in spacing between the balls forming the line - is also controlled. Different kinds of behavior are observed. In particular, we obtain a regime where the ball quickly reaches a constant mean velocity. In this regime, we investigate the friction forces during contacts and identify in a generalized model the regions which are dominated by solid friction or by loss due to collisions. We show that smaller balls get trapped more easily on a rough surface which might explain the origin of the segregation process found in rotating drums and sandpiles. We also study this system for different values of the bumpiness of the line and find conditions under which the constant velocity regime disappears completely.



© Les Editions de Physique 1994

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.