Other
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.1595p&link_type=abstract
Advances in Space Research, Volume 20, Issue 8, p. 1595-1604.
Other
18
Scientific paper
In the solar nebula, the formation of planetesimals and cometesimals is believed to be due to inelastic collisions between dust grains and due to van der Waals and other attractive surface forces. The low velocity collisions result from Brownian motion for the micron-sized pre-planetary dust particles, from differential sedimentation and gas drag-induced orbital decay for mm-sized dust aggregates, and from decoupling from gas turbulence for larger bodies. Modelling these processes is extremely difficult as there exists no theoretical description on the outcome of multiple aggregate-aggregate collisions including physical processes as coagulation, restructuring, compaction, and fragmentation. To investigate these problems from the experimental side, we developed several simulation experiments with analogous micron-sized particles. One set of experiments investigates individual grain-target collisions to determine the collisional and sticking properties of small grains. Another type of experiments deals with the production of fractal dust aggregates which are then used to observe single and multiple collisional events.
Blum Jacques
Poppe Torsten
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