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Related Experiment Videos

Propagating front in an excited granular layer.

W Losert1, D G Cooper, J P Gollub

  • 1Department of Physics, Haverford College, Haverford, Pennsylvania 19041, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
Summary

Vibrated steel beads exhibit ordering transitions. A disordered state transitions to an excited state via a propagating front, demonstrating cooperative behavior in granular materials.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Granular materials exhibit complex behaviors under vibration.
  • Understanding ordering transitions and cooperative phenomena is crucial for material science.

Purpose of the Study:

  • Investigate the stability of disordered states in vibrated granular monolayers.
  • Characterize the transition from amorphous to gaseous states and the role of perturbations.

Main Methods:

  • Vertical vibration of a steel bead monolayer on a flat plate.
  • Analysis of ordering transitions and cooperative behavior near 1g acceleration.
  • Modeling based on single vibrated particles with multiple attractors and collision perturbations.

Main Results:

Related Experiment Videos

  • Remarkable ordering transitions and cooperative behavior observed below 1g acceleration.
  • The transition from amorphous to gaseous state is typically subcritical, initiated by perturbations.
  • Front velocity was measured as a function of applied acceleration.
  • A model explains the phenomenon, with simulations showing collision rates preventing ground state trapping.

Conclusions:

  • Vibrated granular systems display complex dynamics and phase transitions.
  • Perturbation-initiated propagating fronts drive transitions between disordered and ordered states.
  • Interparticle collisions play a key role in preventing system collapse into a non-moving ground state.