Granular segregation driven by particle interactions
Keywords: 
Function generators
Rolling friction
Particle interactions
Packing fractions
Colloidal dispersions
Issue Date: 
2015
Publisher: 
American Physical Society
ISSN: 
0031-9007
Citation: 
Lozano C, Zuriguel I, Garcimartín A, Mullin T. Granular segregation driven by particle interactions. Phys Rev Lett (2015, May);114(17).
Abstract
We report the results of an experimental study of particle-particle interactions in a horizontally shaken granular layer that undergoes a second order phase transition from a binary gas to a segregation liquid as the packing fraction C is increased. By focusing on the behavior of individual particles, the effect of C is studied on (1) the process of cluster formation, (2) cluster dynamics, and (3) cluster destruction. The outcomes indicate that the segregation is driven by two mechanisms: attraction between particles with the same properties and random motion with a characteristic length that is inversely proportional to C. All clusters investigated are found to be transient and the probability distribution functions of the separation times display a power law tail, indicating that the splitting probability decreases with time.

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