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Granular Impact Dynamics: Acoustics and Fluctuations
Abstract
In the corresponding fluid dynamics video, created for the APS DFD 2012 Gallery of
Fluid Motion, we show high-speed videos of 2D granular impact experiments, where an
intruder strikes a collection of bidisperse photoelastic disks from above. We discuss
the force beneath the intruder, which is strongly fluctuating in space and time. These
fluctuations correspond to acoustic pulses which propagate into the medium. Analysis
shows that this process, in our experiments, is dominated by collisions with grain
clusters. The energy from these collisions is carried into the granular medium along
networks of grains, where is it dissipated.
Type
Journal articlePermalink
https://hdl.handle.net/10161/10951Collections
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Show full item recordScholars@Duke
Robert P. Behringer
James B. Duke Professor of Physics
Dr. Behringer's research interests include granular materials: friction, earthquakes,
jamming; nonlinear dynamics; and fluids: Rayleigh-Benard convection, the flow of thin
liquid films, porous media flow, and quantum fluids. His studies focus particularly
on experiments (with some theory/simulation) that yield new insights into the dynamics
and complex behavior of these systems. His experiments involve a number of highly
novel approaches, including the use of photoelasticity for probing granular
This author no longer has a Scholars@Duke profile, so the information shown here reflects
their Duke status at the time this item was deposited.
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