An important class of non-Newtonian fluids presents a yield stress limit which must be exceeded before significant deformation can occur – the so-called viscoplastic fluids or Bingham plastics. In order to model the stress-strain relation in these fluids, some fitting have been proposed such as the linear Bingham equation and the non-linear Herschel-Bulkley and Casson models.

xanthan gum solutions, which have a shear thinning behavior with yield stress (viscoplastic). The Herschel-Bulkley law is used to model the fluid behavior.

of Civil and Environmental Engineering, Univ. of Alberta, T6G 2W2, Edmonton AB, Canada 2Dept. of Civil Engineering, Lakehead University, P7B 5E1, Thunder Bay, ON, Canada *corresponding author: david.zhu@ualberta.ca , Tel: (780) 492-5813 Viscoplastic Fluids; by flwmaster. Published November 7, 2016. Authors Dimakopoulos Y., Tsamopoulos J. Abstract We study the transient displacement of Newtonian and viscoplastic liquids by highly pressurized air in cylindrical tubes of finite length with an expansion followed by … We present an experimental and numerical study of the turbulent displacement of viscoplastic fluids in a horizontal eccentric annulus. Several experiments where a weighted Newtonian fluid displaces a yield stress fluid under a turbulent flow condition are presented and discussed.

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2019-09-12 · ABSTRACT. We present a methodology for simulating three-dimensional flow of incompressible viscoplastic fluids modeled by generalized Newtonian rheological equations. It is implemented in a highly efficient framework for massively parallelizable computations on block-structured grids. Viscoplastic Fluids 6 posts Authors Dimakopoulos Y., Pavlidis M., Tsamopoulos J. Abstract The steady, buoyancy-driven rise of a bubble in a Herschel-Bulkley fluid is examined assuming axial symmetry. Typically, fluids that exhibit this behavior are macromolecular in nature (that is, they have high molecular weight), such as polymeric fluids (melts and solutions) used to make plastic articles, food systems such as dough used to make bread and pasta, and biological fluids such as synovial fluids found in joints.

• The role of of a large family of turbulent purely-viscous and viscoplastic fluid. 26 Apr 2016 Liquid interfaces in viscous straining flows: Numerical studies of the selective withdrawal transition.

In this work, a numerical simulation of a viscoplastic fluid flows through an axysimetric expansion followed by a contraction is performed. One of the goals is to 

Köp boken Fluid Mechanics of Viscoplasticity av Raja R. Huilgol (ISBN 9783662522981) hos Adlibris. Next, a careful description of the continuum mechanics behind the constitutive equations for incompressible and compressible viscoplastic fluids is given in  Dense granular flow in a bubbling fluidized bed as a viscoplastic fluid. Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2016  LIBRIS titelinformation: Fluid Mechanics of Viscoplasticity [Elektronisk resurs] / by Raja R. Huilgol.

LIBRIS titelinformation: Fluid Mechanics of Viscoplasticity [Elektronisk resurs] / by Raja R. Huilgol.

Some traditional viscoplastic materials in some non-traditional flow configurations, and some non-traditional viscoplastic fluid flows (plus pertinent references), from top right to bottom left Following Fusi et al.

In the limit of a large yield stress, or equivalently at the initiation of motion, viscoplastic flows can develop narrow boundary layers that provide either surfaces of failure between rigid plugs, the lubrication between a plugged flow and a wall or buffers for regions of predominantly plastic deformation.
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Viscoplastic flows were characterised in vessels equipped with Rushton turbines.

An extensive bibliography appears at the Basic Equations of Fluid Mechanics - Introductory text, geared toward advanced undergraduate and  Dense granular fluids in confined geometry Concentrated non-Brownian suspensions in viscous fluids. The granular silo as a continuum visco-plastic flow. This include liquid cooling based on own-developed pumps without of a finite strain elastic-viscoplastic self-consistent crystal plasticity model  Optical sensors based on liquid crystals for measuring DC fields in air.
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Welcome to VPF8, Cambridge, UK, 16th-20th September 2019. Viscoplastic materials are fluids that exhibit a yield stress: below a certain critical shear stress there is no deformation of the fluid and it behaves like a rigid solid, but when that yield value is exceeded, the material flows like a fluid.

The modeling of Bingham materials is of crucial importance in industrial applications, since a large variety of materials (e.g. foams, pastes, slurries, oils, ceramics, etc.) exhibit the fundamental character of viscoplasticity, that is the capability of flowing only if the stress is above some critical value. 4th Workshop on Viscoplastic Fluids: From Theory to Application – Rio de Janeiro, Brazil, November 6-10, 2011 FOREWORD These proceedings contain the abstracts of the presentations of the Fourth Workshop "Viscoplastic Fluid: From Theory to Application," held at Marina Palace Hotel in Rio de Janeiro, RJ, Brazil, on November 6-10, 2011. 2019-11-23 This special issue contains papers based on work presented at the workshop: Viscoplastic Fluids, from Theory to Application, held in Cambridge UK, September 2019. 2017-01-26 For both types of fluids the rate of strain depends on stress applied and the type of viscoelastic or viscoplastic material you are investigating. Example models of viscoplastic liquids include In the present work, we study LIFT of viscoplastic (VP) fluids.

26 Jun 2018 Bingham fluids, or yield stress fluids, are encountered in a wide range of applications: toothpastes, cements, mortars, foams, muds, mayonnaise, 

4th Workshop on Viscoplastic Fluids: From Theory to Application – Rio de Janeiro, Brazil, November 6-10, 2011 FOREWORD These proceedings contain the abstracts of the presentations of the Fourth Workshop "Viscoplastic Fluid: From Theory to Application," held at Marina Palace Hotel in Rio de Janeiro, RJ, Brazil, on November 6-10, 2011. The rheological behavior of the viscoplastic fluids is represented by the Herschel‐Bulkley viscosity function. The deformation behavior of commonly encountered viscoplastic fluids is generally complicated by the presence of wall slip at solid walls, which is a function of the wall shear stress. Viscoplastic fluids rheology exhibit the so-called 'yield stress, τ 0 ' that governs the transition from solid-like to liquid-like response 1. These fluids develop stagnation regions, where the material does not plastically deform due to elastic resistance from the microstructure. Hence, their velocity gradients vanish in these regions.

sion for viscoplastic fluids was derived by Pleiner.