Diffusing-wave spectroscopy of dynamics in a three-dimensional granular flow.

Physics – Fluid Dynamics

Scientific paper

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Grains: Fluid Dynamics

Scientific paper

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 103 to 104times 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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