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Related Experiment Videos

Close-packed floating clusters: granular hydrodynamics beyond the freezing point?

Baruch Meerson1, Thorsten Pöschel, Yaron Bromberg

  • 1Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Physical Review Letters
|August 9, 2003
PubMed
Summary

Granular flows with inelastic hard spheres form hexagonal close-packed clusters. Surprisingly, this dense structure is accurately predicted by Navier-Stokes granular hydrodynamics (NSGH), even beyond its typical applicability.

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Area of Science:

  • Physics
  • Complex Systems
  • Granular Materials

Background:

  • Monodisperse granular flows can exhibit ordered structures.
  • Hexagonal close packing is a common arrangement in dense granular systems.

Purpose of the Study:

  • Investigate the formation of hexagonal close-packed regions in granular flows.
  • Determine the applicability of granular hydrodynamics to these dense structures.

Main Methods:

  • Molecular dynamics simulations of inelastic hard spheres.
  • Utilizing a "thermal" plate for particle driving.

Main Results:

  • Observed formation of a close-packed cluster supported by a low-density region.
  • Demonstrated that Navier-Stokes granular hydrodynamics (NSGH) accurately describes the density profile, including the close-packed cluster.

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  • Identified parameters where NSGH is effective beyond the freezing point.

    • Conclusions:

    • The formation of close-packed clusters in granular flows is a robust phenomenon.
    • Navier-Stokes granular hydrodynamics provides a surprisingly accurate description of these dense granular systems.
    • A simple explanation for the success of NSGH beyond the freezing point is proposed.