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Onsager variational principle for granular fluids.

M Noirhomme1, E Opsomer1, N Vandewalle1

  • 1GRASP, Institute of Physics B5a, <a href="https://ror.org/00afp2z80">University of Liège</a>, B4000 Liège, Belgium.

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Summary
This summary is machine-generated.

Granular fluids exhibit a gas-liquid transition due to particle collisions. The Onsager principle accurately models this, predicting phenomena like the Maxwell demon in these complex systems.

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Area of Science:

  • Physics
  • Non-equilibrium thermodynamics
  • Soft matter physics

Background:

  • Granular fluids are dissipative systems out of equilibrium.
  • Inelastic collisions drive a gas-to-liquid-like state transition.
  • Classical models struggle with phenomena like condensation and Maxwell demon effects in granular systems.

Purpose of the Study:

  • To demonstrate the applicability of the Onsager variational principle to granular fluids.
  • To accurately predict gas-liquid coexistence in granular systems.
  • To provide a framework for modeling other complex granular phenomena.

Main Methods:

  • Application of the Onsager variational principle.
  • Theoretical modeling of granular fluid dynamics.
  • Analysis of particle collision effects on system states.

Main Results:

  • The Onsager variational principle accurately predicts gas-liquid state coexistence.
  • The model captures condensation and Maxwell demon-like localization.
  • The approach is validated for dissipative granular systems.

Conclusions:

  • The Onsager variational principle offers a powerful tool for understanding granular fluids.
  • This method can model complex non-equilibrium phenomena.
  • Opens avenues for studying granular segregation and jamming transitions.