The role of dilation and confining stresses in shear thickening of dense suspensions

By Eric Brown, Heinrich M. Jaeger. 2010

300 citations recorded by the source corpus.

Many densely packed suspensions and colloids exhibit a behavior known as Discontinuous Shear Thickening in which the shear stress jumps dramatically and reversibly as the shear rate is increased. We performed rheometry and video microscopy measurements on a variety of suspensions to determine the mechanism for this behavior. We distinguish Discontinuous Shear Thickening from inertial effects by showing that the latter are characterized by a Reynolds number but are only found for lower packing fractions and higher shear rates than the former. Shear profiles and normal stress measurements indicate that, in the shear thickening regime, stresses are transmitted through frictional rather than viscous interactions. We come to the surprising conclusion that for concentrated suspensions such as cornstarch in water which exhibit the phenomenon of Discontinuous Shear Thickening, the local constitutive relation between stress and shear rate is not necessarily shear thickening. If the suspended particles are heavy en...

Subfields: Computational Mechanics, Fluid Flow and Transfer Processes, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d6dfb016a4c3aa535b149f839bddcfb7d02e4266

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Computational Mechanics

In Fluid Flow and Transfer Processes

In Materials Chemistry

Citations in the corpus

Shear thickening, frictionless and frictional rheologies in non-Brownian suspensions (2014, methodology): “…where it is observed that the stress in the high viscosity state is set by the weakest stress scale in the sample (which might be a large stress scale for the rheometer usage range), whether it is the particles’ stiffness or the surface tension on the edge of the rheometer [Brown and Jaeger 2012].”
The rheology of shear thickening fluids with various ceramic particle additives (2016, background): “As well as a purely hydro-clustering approach, the contribution of contact forces is suggested in recent studies [47]–[51].”
Gas migration regimes and outgassing in particle-rich suspensions (2015, unknown): “The strength of the particle networks is determined by the number of particles in contact with each other [22], the friction between particles [36], and the magnitude of the forces that resist particle displacement / dilation, such as the flexibility of the boundaries against which the force chains ”
Shear thickening in concentrated suspensions: phenomenology, mechanisms and relations to jamming (2013, background): “The maximum particle size at which shear thickening was found is about 1 mm (Brown and Jaeger, 2012).”