Liquid Migration in Shear Thickening Suspensions Flowing through Constrictions

2018/08/31 by Rory E. O'Neill, Rory E. O’Neill, J Royer +2
Chemical Engineering · Engineering · Physics and Astronomy · #Composite material #Dilatant #Fluid Dynamics and Heat Transfer #Granular flow and fluidized beds #Materials science #Mechanics #Physics #Rheology and Fluid Dynamics Studies #Shear (geology) #Thickening #cond-mat.soft

paper · pdf · doi:10.1103/physrevlett.123.128002

published as Phys. Rev. Lett. 123, 128002 (2019) · 5 pages, 5 figures

openalex created_date 2018/09/07 · openalex publication_date 2019/09/16 · arxiv created 2019/09/17 · arxiv updated 2019/09/25 · openalex updated_date 2026/08/06

Abstract

Dense suspensions often become more dilute as they move downstream through a constriction. We find that as a shear-thickening suspension is extruded through a narrow die and undergoes such liquid migration, the extrudate maintains a steady concentration ϕ_out^LM, independent of time or initial concentration. At low volumetric flow rate Q, ϕ_out^LM is a universal function of Q/r_d³, a characteristic shear rate in the die of radius r_d, and coincides with the critical input concentration for the onset of LM, ϕ_in^crit. We predict this function by coupling the Wyart-Cates model for shear thickening and the "suspension balance model" for solvent permeation through particles.

Citations

• Towards a Unified Description of the Rheology of Hard-Particle Suspensions
• Discontinuous Shear Thickening without Inertia in Dense Non-Brownian Suspensions
• Discontinuous Shear Thickening of Frictional Hard-Sphere Suspensions