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Casimir-like effect on a granular pile.

Y Y Villanueva1, D V Denisov, S de Man

  • 1Division of Physics, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1081, 1081HV Amsterdam, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
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Summary
This summary is machine-generated.

Researchers observed a Casimir-like effect in rice piles, where avalanches pull two plates together. This phenomenon, driven by avalanche confinement, was studied over 25 hours, demonstrating significant distance changes.

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Area of Science:

  • Physics
  • Complex Systems
  • Granular Materials

Background:

  • The Casimir effect describes an attractive or repulsive force between two uncharged, conductive surfaces in a vacuum, arising from quantum fluctuations.
  • Granular materials, like rice, exhibit complex behaviors including avalanches with power-law size distributions, suggesting underlying collective dynamics.

Purpose of the Study:

  • To experimentally investigate a Casimir-like effect in a three-dimensional rice pile.
  • To analyze the relationship between rice avalanches and the confinement-induced force between parallel plates.

Main Methods:

  • A 3D rice pile was created with continuous, uniform grain addition.
  • Two parallel Plexiglas sheets were placed within the pile, aligned with the mean avalanche flow.
  • The change in distance between the sheets was measured over 25-hour experimental runs for various initial separations.

Main Results:

  • A Casimir-like effect was observed, where rice avalanches drove the two plates together.
  • The confinement of avalanches was identified as the mechanism responsible for the attractive force.
  • Observed distance changes ranged from 6.0 mm to less than 1.0 mm for initial distances of 20.0 to 90.0 mm.

Conclusions:

  • The study demonstrates a macroscopic Casimir-like effect in granular media, driven by avalanche dynamics.
  • A simple analytical model corroborated the experimental findings regarding distance dependence.
  • This research offers insights into force generation and confinement phenomena in complex granular systems.