Volume 43, Number 1, July I 1998
|Page(s)||1 - 6|
|Published online||01 September 2002|
Microscopic model for granular stratification and segregation
PMMH, Ecole Supérieure de Physique et de Chimie
Industielles 10 rue Vauquelin,
75231 Paris Cedex 05, France
2 Center for Polymer Studies, Physics Department, Boston University Boston, MA 02215 USA
3 Institute for Computer Applications 1, University of Stuttgart, Pfaffenwaldring 27, 70569 Stuttgart, Germany
Accepted: 11 May 1998
We study segregation and stratification of mixtures of grains differing in size, shape and material properties poured into two-dimensional silos using a microscopic lattice model for surface flows of grains. The model incorporates the dissipation of energy in collisions between rolling and static grains and an energy barrier describing the geometrical asperities of the grains. We study the phase diagram of the different morphologies predicted by the model as a function of the two parameters. We find regions of segregation and stratification, in agreement with experimental finding, as well as a region of total mixing.
PACS: 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion / 46.10.+z – Mechanics of discrete systems / 64.75.+g – Solubility, segregation, and mixing; phase separation
© EDP Sciences, 1998
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