Structure of propagating high-stress fronts in a shear-thickening suspension.

ABSTRACT: We report direct measurements of spatially resolved stress at the boundary of a shear-thickening cornstarch suspension revealing persistent regions of high local stress propagating in the flow direction at the speed of the top boundary. The persistence of these propagating fronts enables precise measurements of their structure, including the profile of boundary stress measured by boundary stress microscopy (BSM) and the nonaffine velocity of particles at the bottom boundary of the suspension measured by particle image velocimetry (PIV). In addition, we directly measure the relative flow between the particle phase and the suspending fluid (fluid migration) and find the migration is highly localized to the fronts and changes direction across the front, indicating that the fronts are composed

SUBMITTER: Rathee V 

PROVIDER: S-EPMC9371692 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature