Europhys. Lett, 44 (3), pp. 386-392 (1998)
Filling a silo with a mixture of grains:
A. Károlyi 1,2,3, J. Kertész 1, S. Havlin 3,4, H. A. Makse 3,5 and H. E. Stanley 3
1 Department of Theoretical Physics, Technical University of
Budafoki u. 8, 1111 Hungary
2 Theoretische Physik, FB 10, Gerhard-Mercator Universität - 47048 Duisburg, Germany
3 Center for Polymer Studies and Physics Department, Boston University
Boston, MA 02215, USA
4 Minerva Center and Department of Physics, Bar-Ilan University - Ramat Gan, Israel
5 Schlumberger-Doll Research, Old Quarry Road - Ridgefield, CT 06877, USA
(received 17 June 1998; accepted in final form 10 September 1998)
PACS. 83.70Fn - Granular solids.
PACS. 64.75 - Solubility, segregation, and mixing; phase separation.
PACS. 46.10 - Mechanics of discrete systems.
We study the filling process of a two-dimensional silo with inelastic particles by simulation of a granular-media lattice gas (GMLG) model. We calculate the surface shape and flow profiles for a monodisperse system and we introduce a novel generalization of the GMLG model for a binary mixture of particles of different friction properties where, for the first time, we measure the segregation process on the surface. The results are in good agreement with a recent theory, and we explain the observed small deviations by the nonuniform velocity profile.