Sudden Chain Energy Transfer Events in Vibrated Granular Media

Nicolás Rivas, Suomi Ponce, Basile Gallet, Dino Risso, Rodrigo Soto, Patricio Cordero, Nicolás Mujica
2011 Physical Review Letters  
In a mixture of two species of grains of equal size but different mass, placed in a vertically vibrated shallow box, there is spontaneous segregation. Once the system is at least partly segregated and clusters of the heavy particles have formed, there are sudden peaks of the horizontal kinetic energy of the heavy particles, that is otherwise small. Together with the energy peaks the clusters rapidly expand and the segregation is partially lost. The process repeats once segregation has taken
more » ... ation has taken place again. Depending on the experimental or numerical parameters, the energy bursts can occur either randomly or with some regularity in time. An explanation for these events is provided based on the existence of a fixed point for an isolated particle bouncing with only vertical motion. The horizontal energy peaks occur when the energy stored in the vertical motion is partly transferred into horizontal energy through a chain reaction of collisions between heavy particles. A necessary condition for the observed regularity of the events is that chain reactions involve most of the heavy particles.
doi:10.1103/physrevlett.106.088001 pmid:21405602 fatcat:ule6apslcvgxpndsj22k4smwaa