Materials such as foams, concentrated emulsions, dense suspensions or colloidal gels, are yield stress fluids. Their steady flow behavior, characterized by standard rheometric techniques, is usually modeled by a Herschel-Bulkley law. The emergence of techniques that allow the measurement of their local flow properties (velocity and volume fraction fields) has led to observe new complex behavior...

The behavior of colloidal gels under pressure-driven flow in square microchannels is quantified by microscopic particle image velocimetry (muPIV) and compared to predictions of available rheological models. The gels consist of hydrophobically modified silica microspheres (phi = 0.15-0.33) suspended in a refractive index-matched fluid along with fluorescent tracers to aid visualization. Measured...

Solid-fluid interaction vitally influences the flow dynamics of particles in a geophysical flow. A coupled computational fluid and discrete element method (CFD-DEM) is used this study to model multiphase as mixture solid phases. The two non-Newtonian fluids (i.e., Bingham Hershcel-Bulkley fluids) water mixed with are considered simulation, while dry granular same volume simulated control test. ...

To study the hydrodynamics of the arterial system a knowledge of the elastic constants of the arterial wall, from which one can predict the ‘natural’ velocity, is of fundamental importance (Mc Donald, 1974).The aim of the present study is to analyze the effect of non-Newtonian nature of blood through an Elastic artery. The artery is considered elastic and blood is considered under power-law mod...

The effect of polycarboxylate superplasticizer on the fluidity and rheology cement - silica fume water paste was investigated. changes dispersion degree, yield stress plastic viscosity with different content were analyzed. results show that rheological properties conform to Herschel-Bulkley model. shear thinning slurry is manifested as a typical yielding pseudoplastic fluid characteristic. When...

ANN model was designed to study the effect of blood flow and cross sectional area through tapered artery with mild stenosis , considering blood flow as a two-fluid model with the suspension of all the erythrocytes in the core region as Herschel-Bulkley fluid and the plasma in the peripheral layer as Newtonian fluid. Different ANN architecture were tested by varying network topology, resulting i...

An asymptotic model is constructed to describe the bending of thin sheets, or plates, viscoplastic fluid described by Herschel–Bulkley constitutive law, which incorporates von Mises yield condition and a nonlinear viscous stress. The reduces number previous ones from plasticity theory mechanics in various limits. It characterized criterion proposed Ilyushin compactly combines effect moment in-p...