Department of Physics Papers

Document Type

Journal Article

Date of this Version

1-2005

Publication Source

Physical Review E

Volume

71

Issue

1

Start Page

016313-1

Last Page

016313-7

DOI

10.1103/PhysRevE.71.016313

Abstract

The dynamics of a sphere fluidized in a nearly levitating upflow of air were previously found to be identical to those of a Brownian particle in a two-dimensional harmonic trap, consistent with a Langevin equation [Ojha et al., Nature (London) 427, 521 (2004)]. The random forcing, the drag, and the trapping potential represent different aspects of the interaction of the sphere with the air flow. In this paper we vary the experimental conditions for a single sphere, and report on how the force terms in the Langevin equation scale with air flow speed, sphere radius, sphere density, and system size. We also report on the effective interaction potential between two spheres in an upflow of air.

Copyright/Permission Statement

© 2005 American Physical Society. You can view the original article at: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.71.016313

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 the University of Pennsylvania.

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Date Posted:10 October 2017

This document has been peer reviewed.