Function generators Rolling friction Particle interactions Packing fractions Colloidal dispersions
American Physical Society
Lozano C, Zuriguel I, Garcimartín A, Mullin T. Granular segregation driven by particle interactions. Phys Rev Lett (2015, May);114(17).
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.