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N. Albers, F. Spahn (Universitaet Potsdam)
Including adhesive effects in the description of viscoelastic binary particle collisions, we are able to reproduce the main features of lab experiments done for icy particles at low temperatures. In terms of the coefficient of restitution, it is furthermore possible to tell aggregation from restitution. A critical impact velocity for aggregation to occur has been obtained. Collisional outcomes are crucially determined by the impacting speed and masses of the collision partners. Since collisions can either result in aggregation, restitution, or fragmentation, the velocity-mass parameter space will be devided accordingly and thus the validity of kinetic equations such as the Smoluchowski equation will be limited. We numerically simulated the size distribution dynamics of a granular particle ensemble. Here we present a combined kinetic description and discuss the influence of fragmentation due to catastrophic impacts on otherwise reduced growth processes.
This work is funded by the Studienstiftung des deutschen Volkes.
The author(s) of this abstract have provided an email address for comments about the abstract: nalbers@agnld.uni-potsdam.de
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Bulletin of the American Astronomical Society, 37 #3
© 2004. The American Astronomical Soceity.