Jamming transitions in a schematic model of suspension rheology
School of Physics, The University of Edinburgh - JCMB, The Kings Buildings Edinburgh, EH9 3JZ, UK
2 Institut Charles Sadron - 6 rue Boussingault, 67083 Strasbourg Cedex, France
Accepted: 12 May 2003
We study the steady-state response to applied stress in a simple scalar model of sheared colloids. Our model is based on a schematic (F2) model of the glass transition, with a memory term that depends on both stress and shear rate. For suitable parameters, we find transitions from a fluid to a nonergodic, jammed state, showing zero flow rate in an interval of applied stress. Although the jammed state is a glass, we predict that jamming transitions have an analytical structure distinct from that of the conventional mode-coupling glass transition. The static jamming transition we discuss is also distinct from hydrodynamic shear thickening.
PACS: 64.70.Pf – Glass transitions / 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening)
© EDP Sciences, 2003