Shear Thickening and Dynamic Glass Transition of Concentrated Suspensions. State of the Problem

摘要

Contemporary interpretation of shear thickening and deformation (dynamic) glass transition phenomena in concentrated suspensions has been considered. The concentration limits that predetermine structuring resulting from volume effects, which control percolation and the randomly limiting volume filling, have been formulated. The former of them is responsible for the appearance of the yield point, while the latter determines the possibility of the dynamic glass transition, which leads to "jamming," i.e., impossibility of a flow. Physicochemical interactions lead to the fact that the yield point may appear at dispersion phase concentrations many orders of magnitude lower than the percolation threshold, while the interactions and friction between dispersed phase particles result in the glass transition at concentrations lower than the randomly limiting volume filling. The contemporary ideas of the possibility or impossibility of the existence of the maximal Newtonian viscosity at stresses below the yield point and the concept of the kinetic (thixotropic) transition through the yield point have been discussed.