%0 Journal Article
%A Menon, Narayanan
%A Durian, Douglas J.
%T Diffusing-Wave Spectroscopy of Dynamics in a Three-Dimensional Granular Flow
%D 1997
%R 10.1126/science.275.5308.1920
%J Science
%P 1920-1922
%V 275
%N 5308
%X 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 104 times longer than the average time between collisions, the grains displayed slow, collective rearrangements, which, at the long-time limit, produced diffusive dynamics.
%U https://science.sciencemag.org/content/sci/275/5308/1920.full.pdf