Energy Loss at Propagating Jamming Fronts in Granular Gas Clusters

Abstract

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, $\Delta E=-K{t}^{3/2}$, a form that can be predicted from kinetic arguments.

4 pages, 3 figures

References in corpus (2)

• Jamming at Zero Temperature and Zero Applied Stress: the Epitome of Disorder
• Experimental investigation of the freely cooling granular gas

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