Kavli Affiliate: Itai Cohen
| First 5 Authors: Anna R. Barth, Anna R. Barth, , ,
| Summary:
Tuning shear thickening behavior is a longstanding problem in the field of
dense suspensions. Acoustic perturbations offer a convenient way to control
shear thickening in real time, opening the door to a new class of smart
materials. However, complete control over shear thickening requires a
quantitative description for how suspension viscosity varies under acoustic
perturbation. Here, we achieve this goal by experimentally probing suspensions
with acoustic perturbations and incorporating their effect on the suspension
viscosity into a universal scaling framework where the viscosity is described
by a scaling function, which captures a crossover from the frictionless jamming
critical point to a frictional shear jamming critical point. Our analysis
reveals that the effect of acoustic perturbations may be explained by the
introduction of an effective interparticle repulsion whose magnitude is roughly
equal to the acoustic energy density. Furthermore, we demonstrate how this
scaling framework may be leveraged to produce explicit predictions for the
viscosity of a dense suspension under acoustic perturbation. Our results
demonstrate the utility of the scaling framework for experimentally
manipulating shear thickening systems.
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