Interaction network analysis in shear thickening suspensions

Abstract

Dense, stabilized, frictional particulate suspensions in a viscous liquid undergo increasingly strong continuous shear thickening (CST) as the solid packing fraction, $\varphi$, increases above a critical volume fraction, and discontinuous shear thickening (DST) is observed for even higher packing fractions. Recent studies have related shear thickening to a transition from mostly lubricated to predominantly frictional contacts with the increase in stress. The rheology and networks of frictional forces from two and three-dimensional simulations of shear-thickening suspensions are studied. These are analyzed using measures of the topology of the network, including tools of persistent homology. We observe that at low stress the frictional interaction networks are predominantly quasi-linear along the compression axis. With an increase in stress, the force networks become more isotropic, forming loops in addition to chain-like structures. The topological measures of Betti numbers and total persistence provide a compact means of describing the mean properties of the frictional force networks and provide a key link between macroscopic rheology and the microscopic interactions. A total persistence measure describing the significance of loops in the force network structure, as a function of stress and packing fraction, shows behavior similar to that of relative viscosity and displays a scaling law near the jamming fraction for both dimensionalities simulated.

15 pages

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• Failure of confined granular media due to pullout of an intruder: From force networks to a system wide response
• Lasting effects of discontinuous shear thickening in cornstarch suspensions upon flow cessation
• Impact-induced hardening in dense frictional suspensions
• Capillary flow of a suspension in the presence of discontinuous shear thickening
• Rigid clusters in shear-thickening suspensions: a nonequilibrium critical transition
• Two approaches to quantification of force networks in particulate systems
• Correlating the force network evolution and dynamics in slider experiments