Flow reversal triggers discontinuous shear thickening response across an erodible granular bed in a Couette-Poiseuille-like flow
Journal
Physical Review E
Journal Volume
105
Journal Issue
5
Date Issued
2022
Author(s)
Lee K.-L
Abstract
Granular rheology is experimentally investigated in a vertical Couette-Poiseuille-like channel flow of photoelastic disks, where an erodible bed is sheared intermittently by an upward-moving shear band and a gravity-induced reverse flow. The shear band conforms to the existing nonlocal Eyring-like rheology but the bed exhibits discontinuous shear thickening from the Bagnold inertial regime near the band-bed interface to the Herschel-Bulkley plastic regime near the static wall. This newly discovered bed rheology is rate dependent and is associated with the fragility of the contact networks indicated by the statistics of local stress states inferred from the material photoelastic responses. © 2022 American Physical Society.
Other Subjects
Elasticity; Shear flow; Couette; Erodible beds; Flow reversals; Granular beds; Herschel-Bulkley; Inertial regimes; Nonlocal; Reverse flow; Shear thickening; Upward-moving; Shear bands; article; flow kinetics; gravity; physiological stress
Type
journal article