title: Flow, ordering, and jamming of sheared granular suspensions.
abstract: 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 or 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.
authors: Dip.to di Scienze Fisiche, Universitá di Napoli Federico II and INFN, Naples, Italy. denis.grebenkov@polytechnique.edu
authors: Denis S
authors: DS
authors: Grebenkov
authors: Massimo Pica
authors: MP
authors: Ciamarra
authors: Mario
authors: M
authors: Nicodemi
authors: Antonio
authors: A
authors: Coniglio