Energy loss at propagating jamming fronts in granular gas clusters.
We explore the initial moments of impact between two dense granular clusters in a two-dimensional geometry. The particles are composed of solid CO(2) and are levitated on a hot surface. Upon collision, the propagation of a dynamic "jamming front" produces a distinct regime for energy dissipation in a granular gas in which the translational kinetic energy decreases by over 90%. Experiments and associated simulations show that the initial loss of kinetic energy obeys a power law in time ΔE = -Kt(3/2), a form that can be predicted from kinetic arguments.
James Franck Institute, Enrico Fermi Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.
Justin C
JC
Burton
Peter Y
PY
Lu
Sidney R
SR
Nagel