The dynamics of dense particle disks

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrodynamics, Particle Size Distribution, Planetary Rings, Boltzmann Transport Equation, Magnetohydrodynamic Stability, Particle Collisions, Plasma Density, Plasma Dynamics, Plasma Equilibrium, Planets, Dynamics, Particles, Equilibrium, Collisions, Transport, Disks, Theroretical Studies, Viscosity, Models, Structure, Rings, Saturn, B Ring, Phases, Dynamics, Zoning

Scientific paper

The authors investigate the mechanical equilibrium and collisional transport processes in differentially rotating dense particle disks in which the filling factor is not small, so that the ordinary Boltzmann kinetic theory is not accurate. The treatment is based on the Enskog theory of dense hard sphere gases, except that the spheres are inelastic. It is shown that the viscous instability which has been suggested as a source of the structure in Saturn's B ring does not arise in the authors' models. However, the ring may be subject to a phase transition similar to the liquid-solid transition seen in molecular dynamics simulations of elastic hard spheres; in this case the ring could have alternating zero-shear ("solid") and high-shear ("liquid") zones.

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