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Stationary state volume fluctuations in a granular medium.
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 phi
of postfluidized states is history independent and Gaussian distributed about a stationary
state. The standard deviation of phi exhibits, as a function of phi, 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)].
Type
Journal articleSubject
Science & TechnologyPhysical Sciences
Physics, Fluids & Plasmas
Physics, Mathematical
Physics
STATISTICAL-MECHANICS
FLUIDIZED-BEDS
DYNAMICS
POWDERS
MODEL
COMPACTION
MIXTURES
PACKING
SPHERES
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https://hdl.handle.net/10161/20168Published Version (Please cite this version)
10.1103/physreve.71.030301Publication Info
Schröter, Matthias; Goldman, Daniel I; & Swinney, Harry L (2005). Stationary state volume fluctuations in a granular medium. Physical review. E, Statistical, nonlinear, and soft matter physics, 71(3 Pt 1). pp. 030301. 10.1103/physreve.71.030301. Retrieved from https://hdl.handle.net/10161/20168.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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