Affiliation:
1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547, USA.
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.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
168 articles.
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