The role of particle collisions for the dynamics in planetary rings.

Details The role of particle collisions for the dynamics in planetary rings. The role of particle collisions for the dynamics in planetary rings.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995csf.....5.1945s&link_type=abstract

Chaos Solitons Fractals, Vol. 5, No. 10, p. 1945 - 1964

Computer Science

10

Planetary Rings: Dynamics, Planetary Rings: Collisions, Planetary Rings: Numerical Simulations

Scientific paper

A new model of collisions between particles in planetary rings is proposed, where the bulk friction of the material of the ring particles (mainly ice for Saturn's rings) as well as the friction between their surfaces are taken into account at the collision. The normal and tangential restitution coefficients, ɛN and ɛT, respectively, which measure the loss of kinetic energy due to collisions, have been obtained by numerical integration of collision equations. In the case of ɛN the authors have developed a new model for colliding spheres, basing on the Hertz contact theory, which has been extended to plastic, or dissipative deformations. The results are compared with those of laboratory experiments. For ɛT the authors try to account for the sub-microscopic properties of the surfaces of the particles. The authors assume that asperities can be deformed either elastically at low relative tangential velocities, or plastically (sticking) in the case of higher tangential impact velocities. The authors discuss the results of their numerical investigations with respect to the kinetics of the particle ensemble in planetary rings.

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