Coagulation of particles in Saturn's rings - Measurements of the cohesive force of water frost

Physics

Scientific paper

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Coagulation, Cohesion, Ice Nuclei, Particle Size Distribution, Saturn Rings, Dynamic Characteristics, Energy Dissipation, Particle Collisions, Saturn, Rings, Particles, Water Ice, Frost, Shear Strength, Parameters, Ice, Velocity, Collisions, Models, Surface, Structure, Dynamics, Size, Tidal Effects, Laboratory Studies, Experiments, Procedure, Calculations, Thickness, Impacts

Scientific paper

Experimental data are presented on the sticking force of water ice particles which are indicative of the role that the cohesive properties of such particles could play in the dynamics of Saturn ring particles. Sticking forces are dependent on particle impact velocities; a 'Velcro' model is devised to describe the surface structure involved in sticking. The data indicate that below the critical impact velocity of about 0.03 cm/sec, particle cohesion always occurs. Due to the optical depth of micron-sized grains in the Saturn rings, particles are hypothesized to be coated with a layer of frost which will render cohesion an important ring-dynamics process.

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