Stationary state volume fluctuations in a granular medium

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Title: Stationary state volume fluctuations in a granular medium
Author: Schroeter, Matthias ; Goldman, Daniel I. ; Swinney, Harry L.
Abstract: A statistical description of static granular material requires ergodic sampling of the phase space spanned by the different configurations of the particles. We periodically fluidize a column of glass beads and find that the sequence of volume fractions ϕ of postfluidized states is history independent and Gaussian distributed about a stationary state. The standard deviation of ϕ exhibits, as a function of ϕ, a minimum corresponding to a maximum in the number of statistically independent regions. Measurements of the fluctuations enable us to determine the compactivity X, a temperaturelike state variable introduced in the statistical theory of Edwards and Oakeshott [Physica A 157, 1080 (1989)].
Description: © 2005 The American Physical Society The electronic version of this article is the complete one and can be found online at: DOI: 10.1103/PhysRevE.71.030301
Type: Article
ISSN: 1539-3755
Citation: Matthias Schroeter, Daniel I. Goldman and Harry L. Swinney, "Stationary state volume fluctuations in a granular medium," Physical Review E Rapid Communications, 71, 030301 (2005)
Date: 2005-03-30
Contributor: Georgia Institute of Technology. School of Physics
University of Texas at Austin. Center for Nonlinear Dynamics
University of Texas at Austin. Dept. of Physics
Publisher: Georgia Institute of Technology
American Physical Society
Subject: Granular systems
Fluctuation phenomena
Random processes
Brownian motion
Equations of state of specific substances
Particle-laden flows

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