Diffusing-Wave Spectroscopy of Dynamics in a Three-Dimensional Granular Flow |
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Authors: | N Menon DJ Durian |
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Affiliation: | Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547, USA. |
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Abstract: | Diffusing-wave spectroscopy was used to measure the microscopic dynamics of grains in the interior of a three-dimensional flow of sand. The correlation functions show that minutely separated grains fly from collision to collision with large random velocities. On a time scale 10(3) to 10(4) times longer than the average time between collisions, the grains displayed slow, collective rearrangements, which, at the long-time limit, produced diffusive dynamics. |
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