Shear rejuvenation, aging and shear banding in yield stress fluids
AuthorAlexandrou, Andreas N.
SourceJournal of Non-Newtonian Fluid Mechanics
Google Scholar check
MetadataShow full item record
The purpose of this work is to simulate shear rejuvenation and aging effects in shear thinning yield stress fluids in a typical rotational rheometer and to provide a common framework to describe the behavior of yield stress materials in general. This is particularly important in the determination of material constants under both steady and unsteady conditions. The breakdown and buildup of structure are studied using a theory based on the Herschel-Bulkley flow model that it is consistent with experimental data. The theory is implemented using a novel computational method. Interestingly, the simulations reveal the existence of time-dependent shear banding that occurs within the gap when the macroscopically imposed shear rate is below a certain critical value. Shear banding is analyzed in detail and results showing the effects of major parameters on the phenomenon are presented. © 2009 Elsevier B.V. All rights reserved.
Showing items related by title, author, creator and subject.
Megalooikonomou, K. G.; Tastani, S. P.; Pantazopoulou, Stavroula J. (2018)The required confined zone in critical regions of columns and piers undergoing lateral sway during earthquakes is related to the plastic hinge length where inelastic deformation and damage develops. The exact definition ...
The Influence of Crack-Face Normal and Shear Stress Loading on Hydraulic Fracture-Tip Singular Plastic Fields Papanastasiou, Panos C.; Durban, D. (2018)We investigated the singular plastic fields at the crack tip of a fracture that is loaded with normal and shear loads due to a viscous flow in a hydraulic fracturing. The level of the expected shear load in comparison with ...
Effect of turbulent pulsating flow around a near-wall submerged cylinder on the potential motion of bed and suspended loads Fonias, E. N.; Grigoriadis, D. G. E. (International Society of Offshore and Polar Engineers, 2016)In the present work, the pulsating flow around a submerged cylinder close to the impermeable seabed is examined by means of Large Eddy Simulations (LES). A Reynolds number equal to Re = 5000 is considered, based on the ...