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

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.

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Date Posted:10 October 2017

This document has been peer reviewed.