Year: 2019
Type: article
Abstract: Colloidal suspensions in industrial processes often exhibit shear thickening that is difficult to control actively. Here, we use piezoelectric transducers to apply acoustic perturbations to dynamically tune the suspension viscosity in the shear-thickening regime. We attribute the mechanism of dethickening to the disruption of shear-induced force chains via perturbations that are large relative to the particle roughness scale. The ease with which this technique can be adapted to various flow geometries makes it a powerful tool for actively controlling suspension flow properties and investigating system dynamics.
Source: Physical Review Letters
Authors: Prateek Sehgal, Meera Ramaswamy, Itai Cohen, Brian J. Kirby
Institutions: Cornell University, Weill Cornell Medicine
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: green
Funder: National Science Foundation
Awards: Using confocal rheometry to investigate shear thickening suspensions, Real-time, Acoustic Tuning of the Rheology of Shear-Thickening Suspensions, NNCI: Cornell Nanoscale Science and Technology Facility (CNF), UNS: Imaging inhomogeneous stress networks in colloidal glasses and gels to determine their role in the bulk response of disordered suspensions
OpenAlex ID: W2945950238