Department of Physics Papers

Document Type

Journal Article

Date of this Version

9-2000

Publication Source

Physical Review E

Volume

62

Issue

3

Start Page

4442

Last Page

4445

DOI

10.1103/PhysRevE.62.4442

Abstract

The packing fraction and the pressure drop across gas-fluidized beds of granular media exhibit hysteresis as the gas-flow rate is cycled up and down across the fluidization transition. Presumably this is due to contact forces and transfer of stress to the surrounding walls, and hence should vary nontrivially with the aspect ratio of the sample. Here we present systematic measurements of the variation of hysteresis with particle size and aspect ratio of the sample. Remarkably, the hysteresis scales in a trivial way with these parameters, showing no evidence of long-range effects of the wall. Our measurements also show that the packing fraction becomes 0.590±0.004, independent of particle size and container shape, when the fluidizing flow of gas flow is slowly removed.

Copyright/Permission Statement

© 2000 American Physical Society. You can view the original article at: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.62.4442

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.

Included in

Physics Commons

Share

COinS
 

Date Posted:10 October 2017

This document has been peer reviewed.