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Related Experiment Videos

Nearly smooth granular gases.

Isaac Goldhirsch1, S H Noskowicz, O Bar-Lev

  • 1Department of Fluid Mechanics and Heat Transfer, Tel-Aviv University, Ramat-Aviv, Tel-Aviv 69978, Israel. isaac@eng.tau.ac.il

Physical Review Letters
|August 11, 2005
PubMed
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Hydrodynamics of nearly smooth granular gases.

The journal of physical chemistry. Bยท2006
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Hydrodynamic equations for granular gases reveal that angular velocity distribution is crucial. This non-Maxwellian field significantly impacts granular gas behavior in various states.

Area of Science:

  • Physics
  • Statistical Mechanics
  • Fluid Dynamics

Background:

  • Granular gases, systems of macroscopic particles interacting via collisions, exhibit complex behaviors.
  • Traditional hydrodynamic descriptions often simplify particle velocity distributions, potentially missing key physics.

Purpose of the Study:

  • To derive hydrodynamic equations for nearly smooth granular gases.
  • To investigate the role of angular velocity distribution in granular gas dynamics.

Main Methods:

  • Derivation of hydrodynamic equations from the Boltzmann equation for granular gases.
  • Analysis of the angular velocity distribution function.

Main Results:

  • Hydrodynamic equations require inclusion of the angular velocity distribution field.

Related Experiment Videos

  • The angular velocity distribution is significantly non-Maxwellian in homogeneous cooling and steady states.
  • In wall-bounded shear flows, boundary-generated spin has a finite penetration depth.

    • Conclusions:

    • A more complete hydrodynamic description of granular gases necessitates considering angular velocity.
    • Non-Maxwellian angular velocity distributions are a key feature of granular gas dynamics.
    • Boundary effects on spin propagate into the bulk of granular gases.