Discontinuous Shear Thickening of Frictional Hard-Sphere Suspensions

作者：Seto, Ryohei^*; Mari, Romain; Morris, Jeffrey F.; Denn, Morton M.

来源：Physical Review Letters, 2013, 111(21): 218301.

DOI：10.1103/PhysRevLett.111.218301

• CONCENTRATED COLLOIDAL SUSPENSIONS
• STOKESIAN DYNAMICS SIMULATION
• DILATANT VISCOSITY BEHAVIOR
• BROWNIAN SUSPENSIONS
• RIGID SPHERES
• RHEOLOGY
• FLOW
• DISPERSIONS
• MICROSTRUCTURE
• TRANSITIONS

Discontinuous shear thickening (DST) observed in many dense athermal suspensions has proven difficult to understand and to reproduce by numerical simulation. By introducing a numerical scheme including both relevant hydrodynamic interactions and granularlike contacts, we show that contact friction is essential for having DST. Above a critical volume fraction, we observe the existence of two states: a low viscosity, contactless (hence, frictionless) state, and a high viscosity frictional shear jammed state. These two states are separated by a critical shear stress, associated with a critical shear rate where DST occurs. The shear jammed state is reminiscent of the jamming phase of granular matter. Continuous shear thickening is seen as a lower volume fraction vestige of the jamming transition.

• 出版日期2013-11-18