Physics – Mathematical Physics
Scientific paper
2011-03-04
2011 J. Phys. A: Math. Theor. 44 285001
Physics
Mathematical Physics
22 pages,5 figures
Scientific paper
10.1088/1751-8113/44/28/285001
We study the origin of buoyancy forces acting on a larger particle moving in a granular medium subject to horizontal shaking and its corrections before fluidization. In the fluid limit Archimedes' law is verified; before the limit memory effects counteract buoyancy, as also found experimentally. The origin of the friction is an excluded volume effect between active particles, which we study more exactly for a random walker in a random environment. The same excluded volume effect is also responsible for the mutual attraction between bodies moving in the granular medium. Our theoretical modeling proceeds via an asymmetric exclusion process, i.e., via a dissipative lattice gas dynamics simulating the position degrees of freedom of a low density granular sea.
Maes Christian
Thomas Randall S.
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