Department of Physics Papers
Document Type
Journal Article
Date of this Version
11-3-1997
Publication Source
Physical Review Letters
Volume
79
Issue
18
Start Page
3407
Last Page
3410
DOI
10.1103/PhysRevLett.79.3407
Abstract
We report measurements by diffusing-wave spectroscopy of particle motions in a gas-fluidized bed. The homogenous state of the bed known as the uniformly fluidized state is actually a weak solid in which particles are at rest. The only truly fluid state is an inhomogenous mixture of gas bubbles and of liquid regions in which microscopic particle dynamics are shown to be collisional. The motion of macroscopic bubbles is the source of particle motions in the bed. Measurements of mean free paths, collision rates, and velocity fluctuations (the “granular temperature”) show that dissipation occurs nonuniformly in the medium.
Copyright/Permission Statement
© 1997 American Physical Society. You van view the original article at: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.79.3407
Recommended Citation
Menon, N., & Durian, D. J. (1997). Particle Motions in a Gas-Fluidized Bed of Sand. Physical Review Letters, 79 (18), 3407-3410. http://dx.doi.org/10.1103/PhysRevLett.79.3407
Date Posted: 13 October 2017
This document has been peer reviewed.
Comments
At the time of publication, author Douglas J. Durian was affiliated with University of California, Los Angeles. Currently, he is a faculty member at the Physics Department at the University of Pennsylvania.