Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-09-09
Powders and Grains 2009, American Institute of Physics (Melville, New York, 2009), p. 859-862
Physics
Condensed Matter
Statistical Mechanics
4 pages, 8 figures
Scientific paper
Cohesive powders form agglomerates that can be very porous. Hence they are also very fragile. Consider a process of complete fragmentation on a characteristic length scale $\ell$, where the fragments are subsequently allowed to settle under gravity. If this fragmentation-reagglomeration cycle is repeated sufficiently often, the powder develops a fractal substructure with robust statistical properties. The structural evolution is discussed for two different models: The first one is an off-lattice model, in which a fragment does not stick to the surface of other fragments that have already settled, but rolls down until it finds a locally stable position. The second one is a simpler lattice model, in which a fragment sticks at first contact with the agglomerate of fragments that have already settled. Results for the fragment size distribution are shown as well. One can distinguish scale invariant dust and fragments of a characteristic size. Their role in the process of structure formation will be addressed.
Brendel Lothar
Poeschel Thorsten
Schwager Thomas
Weuster Alexander
Wolf Dietrich E.
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