Physics
Size segregation of granular matter in silo discharges
Document Type
Article
Abstract
We present an experimental study of segregation of granular matter in a quasi-two-dimensional silo emptying out of an orifice. Size separation is observed when multisized particles are used with the larger particles found in the center of the silo in the region of fastest flow. We use imaging to study the flow inside the silo and quantitatively measure the concentration profiles of bidisperse beads as a function of position and time. The angle of the surface is given by the angle of repose of the particles, and the flow occurs in a few layers only near the top of this inclined surface. The flowing region becomes deeper near the center of the silo and is confined to a parabolic region centered at the orifice which is approximately described by the kinematic model. The experimental evidence suggests that the segregation occurs on the surface and not in the flow deep inside the silo where velocity gradients also are present. We report the time development of the concentrations of the bidisperse particles as a function of size ratios, flow rate, and the ratio of initial mixture. The qualitative aspects of the observed phenomena may be explained by a void filling model of segregation. © 1999 The American Physical Society.
Publication Title
Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Publication Date
1999
Volume
60
Issue
6
First Page
7203
Last Page
7209
ISSN
1063-651X
DOI
10.1103/PhysRevE.60.7203
Repository Citation
Samadani, Azadeh; Pradhan, A.; and Kudrolli, A., "Size segregation of granular matter in silo discharges" (1999). Physics. 144.
https://commons.clarku.edu/faculty_physics/144
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