Glass transitions and shear thickening suspension rheology

摘要: We introduce a class of simple models for shear thickening and/or “jamming” in colloidal suspensions. These are based on the schematic mode coupling theory (MCT) glass transition, having memory term that depends density variable, and both stress rate. (Tensorial aspects rheology, such as normal stresses, ignored simplicity.) calculate steady-state flow curves correlation functions. Depending model parameters, we find range rheological behaviors, including “S-shaped” curves, indicating discontinuous thickening, stress-induced transitions from fluid to nonergodic (jammed) state, showing zero rate an interval applied stress. The jamming scenarios explore appear broadly consistent with experiments dense colloids close despite fact ignore hydrodynamic interactions. In particular, transition propose is conceptually quite differen...