DENSITY PATTERNS IN 2-DIMENSIONAL HOPPERS

Authors
RISTOW GH HERRMANN HJ
Citation
Gh. Ristow et Hj. Herrmann, DENSITY PATTERNS IN 2-DIMENSIONAL HOPPERS, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 50(1), 1994, pp. 180000005-180000008
Citations number
56
Categorie Soggetti
Physycs, Mathematical","Phsycs, Fluid & Plasmas
Journal title
Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics → ACNP
ISSN journal
1063651X
Volume
50
Issue
1
Year of publication
1994
Pages
180000005 - 180000008
Database
ISI
SICI code
1063-651X(1994)50:1<180000005:DPI2H>2.0.ZU;2-1
Abstract
Recent experiments by Baxter et al. [Phys. Rev. Lett. 62, 2825 (1989)) showed the existence of density waves in granular material flowing ou t of a hopper. We show, using molecular dynamics simulations, that thi s effect is a consequence of static friction and find that these densi ty fluctuations follow a 1/f(alpha) spectrum. The effect is enhanced w hen the opening angle of the hopper decreases.