Volume 102, Number 4, May 2013
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||27 May 2013|
Dynamic jamming fronts
1 Department of Physics and James Franck Institute at the University of Chicago - Chicago, IL 60637, USA
2 Department of Physics, St. Olaf College - Northfield, MN 55057, USA
3 Instituut-Lorentz for Theoretical Physics, Leiden University - Leiden NL 2333 CA, The Netherlands, EU
Received: 7 March 2013
Accepted: 30 April 2013
We describe a model experiment for dynamic jamming: a two-dimensional collection of initially unjammed disks that are forced into the jammed state by uniaxial compression via a rake. This leads to a stable densification front that travels ahead of the rake, leaving regions behind it jammed. Using disk conservation in conjunction with an upper limit to the packing fraction at jamming onset, we predict the front speed as a function of packing fraction and rake speed. However, we find that the jamming front has a finite width, a feature that cannot be explained by disk conservation alone. This width appears to diverge on approach to jamming, which suggests that it may be related to growing lengthscales encountered in other jamming studies.
PACS: 45.70.Cc – Static sandpiles; granular compaction / 83.80.Fg – Granular solids / 05.45.-a – Nonlinear dynamics and chaos
© EPLA, 2013
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