Paper Number
GR10 

Session
Gallery of Rheology Contest

Title
Oscillating shear bands in a thixotropic yield-stress fluid

Presentation Date and Time
October 17, 2018 (Wednesday) 6:30

Track / Room
Gallery of Rheology / Woodway Foyer

Authors (Click on name to view author profile)

1. Wei, Yufei (University of Michigan, Chemical Engineering)
2. Solomon, Michael J. (University of Michigan, Chemical Engineering)
3. Larson, Ronald G. (University of Michigan, Department of Chemical Engineering)

Author and Affiliation Lines (in printed abstract book)
Yufei Wei, Michael J. Solomon, and Ronald G. Larson
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI

Speaker / Presenter 
Wei, Yufei

Text of Abstract
We measure the local velocimetry in a thixotropic fumed silica suspension undergoing a shearing deformation with a constant apparent shear rate. This image shows the temporal evolution of the velocity profile (x-axis, time; y-axis, normalized position along the velocity gradient direction; colormap, normalized velocity). The initially uniform flow gradually separates into bands with different local shear rates. The shear bands exhibit sustained periodic oscillations along with slow and irregular evolutions.