Approach to jamming in an air-fluidized granular bed

Abstract

Quasi-2D bidisperse amorphous systems of steel beads are fluidized by a uniform upflow of air, so that the beads roll on a horizontal plane. The short-time ballistic motion of the beads is stochastic, with non-Gaussian speed distributions and with different average kinetic energies for the two species. The approach to jamming is studied as a function of increasing bead area fraction and also as a function of decreasing air speed. The structure of the system is measured in terms of both the Voronoi tessellation and the pair distribution function. The dynamics of the system is measured in terms of both displacement statistics and the density of vibrational states. These quantities all exhibit tell-tale features as the dynamics become more constrained closer to jamming. Though the system is driven and athermal, the behavior is remarkably reminiscent of that in dense colloidal suspensions and supercooled liquids.

experiment

References in corpus (3)

• Jamming at Zero Temperature and Zero Applied Stress: the Epitome of Disorder
• Crystallization of a quasi-two-dimensional granular fluid
• The partition of energy for air-fluidized grains

Cited by in corpus (8)

• Caging dynamics in a granular fluid
• The building blocks of dynamical heterogeneities in dense granular media
• Critical scaling and heterogeneous superdiffusion across the jamming/rigidity transition of a granular glass
• Scaling properties of granular rheology near the jamming transition
• Topological persistence and dynamical heterogeneities near jamming
• Growing length and time scales in a suspension of athermal particles
• Effective temperatures and activated dynamics for a two-dimensional air-driven granular system on two approaches to jamming
• Defect Fluctuations and Lifetimes in Disordered Yukawa Systems