Impulse distributions in dense granular flows: Signatures of large-scale spatial structuresA. Ferguson, B. Fisher and B. Chakraborty
Martin Fisher School of Physics, Brandeis University Mailstop 057, Waltham, MA 02454-9110, USA
(Received 12 September 2003; accepted in final form 11 February 2004)
We study the impulse distribution in a model of gravity-driven granular flow and show that changes in the distribution are correlated with the appearance of clusters of "frequently-colliding" particles. Our simulations show increasingly large linear clusters as the flow velocity decreases. The dissipative nature of the collisions leads to an increase of small-impulse events as the size of these clusters grow and can explain the observed changes in the impulse distribution as the flow rate decreases.
81.05.Rm - Porous materials; granular materials.
45.70.-n - Granular systems.
83.10.Pp - Particle dynamics.
© EDP Sciences 2004