https://doi.org/10.1007/s100510050613
Kinematic segregation of granular mixtures in sandpiles
Laboratoire de Physique de la Matière Condensée, Collège de
France,
11 place M. Berthelot, 75231 Paris Cedex 05, France
and Center for Polymer Studies, and Physics Dept., Boston
University, Boston, MA 02215, USA
Received:
6
July
1998
Accepted:
13
August
1998
Published online: 15 January 1999
We study the segregation of granular mixtures in two-dimensional silos using a recently proposed set of coupled equations for surface flows of grains. We study the thick flow regime, where the grains are segregated in the rolling phase. We incorporate this dynamical segregation process, called kinematic sieving, free-surface segregation or percolation, into the theoretical formalism and calculate the profiles of the rolling species and the concentration of grains in the bulk in the steady state. Our solution shows the segregation of the mixture with the large grains being found at the bottom of the pile in qualitative agreement with experiments.
PACS: 83.70.Fn – Granular solids / 83.10.Pp – Particle dynamics / 47.55.Kf – Multiphase and particle-laden flows
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
