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Related Experiment Videos

Hydrodynamic Maxwell demon in granular systems.

J Javier Brey1, F Moreno, R García-Rojo

  • 1Física Teórica, Universidad de Sevilla, Apartado de Correos 1065, 41080 Sevilla, Spain.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 22, 2002
PubMed
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Spontaneous symmetry breaking occurs in vibrated granular systems. Beyond a critical particle number, systems transition to asymmetric states, accurately modeled by granular gas hydrodynamics.

Area of Science:

  • Physics
  • Nonlinear Dynamics
  • Statistical Mechanics

Background:

  • Spontaneous symmetry breaking is a fundamental concept in physics.
  • Granular materials exhibit complex behaviors under vibration, including phase transitions.
  • Understanding particle distribution in confined systems is crucial for material science.

Purpose of the Study:

  • To investigate spontaneous symmetry breaking in a vibrated granular system with two connected compartments.
  • To identify the critical conditions leading to asymmetric particle distribution.
  • To model the observed phase transition using hydrodynamic equations.

Main Methods:

  • Experimental setup involving a vibrated system with two connected compartments.
  • Systematic variation of particle number to observe phase transitions.

Related Experiment Videos

  • Analysis of particle distribution in steady states.
  • Comparison with theoretical models, specifically hydrodynamic equations for granular gases.

    • Main Results:

    • For low particle numbers, grains are equipartitioned between compartments.
    • Above a critical particle density, spontaneous symmetry breaking occurs.
    • One compartment monotonically decreases particle number towards a stable, asymmetric state.
    • The observed phase transition is accurately described by granular gas hydrodynamics.

    Conclusions:

    • Vibrated granular systems can exhibit spontaneous symmetry breaking without external fields.
    • A critical particle density triggers a transition to asymmetric states.
    • Hydrodynamic equations for granular gases provide an effective model for this phenomenon.
    • The study offers insights into phase separation in vibrofluidized granular materials.