Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-02-27
Phys. Rev. Lett. 100, 078001 (2008)
Physics
Condensed Matter
Soft Condensed Matter
4 pages
Scientific paper
10.1103/PhysRevLett.100.078001
We study the rheological properties of a granular suspension subject to constant shear stress by constant volume molecular dynamics simulations. We derive the system `flow diagram' in the volume fraction/stress plane $(\phi,F)$: at low $\phi$ the flow is disordered, with the viscosity obeying a Bagnold-like scaling only at small $F$ and diverging as the jamming point is approached; if the shear stress is strong enough, at higher $\phi$ an ordered flow regime is found, the order/disorder transition being marked by a sharp drop of the viscosity. A broad jamming region is also observed where, in analogy with the glassy region of thermal systems, slow dynamics followed by kinetic arrest occurs when the ordering transition is prevented.
Ciamarra Massimo Pica
Coniglio Antonio
Grebenkov Denis S.
Nicodemi Mario
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