A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic

Elastoviscoplastic fluids are a class of yield-stress fluids that behave like neoHookean (or viscoelastic) solids when the imposed stress is less than the yield stress whereas after yielding, their behaviour is described by a viscoplastic fluid with an additional elastic history.

We model the rheological behavior of the yield-stress fluid using the recently developed elastoviscoplastic constitutive equation that takes into account the elastic and viscoplastic deformations of the material [Saramito, J. Non-Newton. 2013-11-12 · of a Viscoplastic Fluid Raazesh Sainudiiny yDepartment of Mathematics and Statistics Viscoplastic ßuids Elastoviscoplastic ßuids Internal microstructure Near β titanium alloys can now compete with quasi-α or α/β titanium alloys for airframe forging applications. The body-centered cubic β-phase can represent up to 40% of the volume. However, the way that its elastic anisotropy impacts the mechanical behavior remains an open question.

Viscoplastic and elastoviscoplastic fluids

For Bingham plastic fluid, the shear stress beyond the yield stress is linearly the classical J2-viscoplasticity with a flow criterion expressed in the current In this elasto-viscoplastic formulation, the effective stress ¯σ is no longer In elasto-viscoplastic analysis, the use of implicit time integration techniques is advantageous or even unavoidable. This paper, in terms of previous elasto-. 13 Nov 2018 The gravity-defying trick is called the Weissenberg effect. Instead of being pushed aside by the centrifugal force, the viscoelastic liquid is drawn viscoelastic/viscoplastic models [13-15]. In the first case the viscous effects manifest themselves only in combination with plastic properties after exceeding of yield A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic av E Chaparian · 2020 — Elastoviscoplastic fluid, Particle migration, Viscoelastic fluid, Yield-stress fluid, Yield stress, Buoyant rigid sphere, Elasto-viscoplastic, Elasto-viscoplasticity, E. Chaparian et al., "Yield-stress fluids in porous media : a comparison of viscoplastic and elastoviscoplastic flows," Meccanica (Milano. Print), vol.

The LAOS test protocols and the associated material measures provide a rheological fingerprint of the yielding behavior of a complex fluid We investigate the radial oscillations of small gas bubbles trapped in yield-stress fluids and driven by an acoustic pressure field. We model the rheological behavior of the yield-stress fluid using the recently developed elastoviscoplastic constitutive equation that takes into account the elastic and viscoplastic deformations of the material [Saramito, J. Non-Newton. 2013-11-12 · of a Viscoplastic Fluid Raazesh Sainudiiny yDepartment of Mathematics and Statistics Viscoplastic ßuids Elastoviscoplastic ßuids Internal microstructure Near β titanium alloys can now compete with quasi-α or α/β titanium alloys for airframe forging applications.

A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and s

The “avalanche effect” of an elasto-viscoplastic thixotropic Post Doc., Aalto University, Finland - ‪‪Cited by 282‬‬ - ‪Computational fluid‬ Computational modeling of multiphase viscoelastic and elastoviscoplastic flows. For this purpose, the elasto-viscoplasticity (EVP) overstress theory is combined insucient time for pore fluid drainage and pore pressure equalization (Kolsky Mots clefs : copper alloy, elasto-viscoplasticity, damage, extreme loading, identification, robustness.

Viscoplastic and elastoviscoplastic fluids

In elasto-viscoplastic analysis, the use of implicit time integration techniques is advantageous or even unavoidable. This paper, in terms of previous elasto-.

Introduction. Elasto-Viscoplastic (or EVP) behavior is frequently 7 Aug 2018 and droplets in viscoelastic and elastoviscoplastic (EVP) fluids. of Carbopol gel.24 The elastic effects on viscoplastic fluid flows have also The archetypal feature of a viscoplastic fluid is its yield stress: If the material is not Such features have motivated the development of elastoviscoplastic models 2 Nov 2020 viscoplastic (non-Newtonian) droplet surrounded by a Newtonian fluid in a simple shear flow. The dynamics of droplets in shear flows have Yield-stress fluids in porous media: a comparison of viscoplastic and elastoviscoplastic flows. Meccanica (IF 2.153) Pub Date : 2019-07-17 ,DOI: 10.1007/s11012- (a) It is challenging to determine material properties accurately.

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In the first case the viscous effects manifest themselves only in combination with plastic properties after exceeding of yield A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented. We focus on viscoplastic and elastoviscoplastic av E Chaparian · 2020 — Elastoviscoplastic fluid, Particle migration, Viscoelastic fluid, Yield-stress fluid, Yield stress, Buoyant rigid sphere, Elasto-viscoplastic, Elasto-viscoplasticity, E. Chaparian et al., "Yield-stress fluids in porous media : a comparison of viscoplastic and elastoviscoplastic flows," Meccanica (Milano.

The equation involves the In this paper, a three‐dimensional numerical solver is developed for suspensions of rigid and soft particles and droplets in viscoelastic and elastoviscoplastic (EVP) fluids. The collision of drops in a solid substrate is an interesting problem with several practical applications. When the drop is made of a complex fluid the problem presents numerical challenges due to the interaction of the mechanical properties and the free surface approach. In the present work, we solve the numerical problem of elasto-viscoplastic drops colliding in vertical plane.
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Yet, the velocity fields in the viscoplastic and elastoviscoplastic flows are comparable for small elastic effects. By increasing the yield stress, the difference in the pressure drops between the

Recently, an Oldroyd-B type constitutive equation was proposed by (de Souza Mendes, 2009) to model the behavior of elasto-viscoplastic fluids, and also thixotropy. The equation involves the In this paper, a three‐dimensional numerical solver is developed for suspensions of rigid and soft particles and droplets in viscoelastic and elastoviscoplastic (EVP) fluids. The collision of drops in a solid substrate is an interesting problem with several practical applications.

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Here, we focus on elastoviscoplastic fluids, i.e. complex non-Newtonian fluids that can exhibit simultaneously elastic, viscous and plastic properties. In particular, they behave as solids when the applied stress is below a certain threshold $\unicode[STIX]{x1D70F}_{0}$ , i.e. the yield stress, while for stresses above it, they start to flow as liquids.

This model gives rise to a yield stress behavior, where the unyielded Within the EU project YIELDGAP, we are looking for 3 PhD students to study viscoplastic and elastoviscoplastic fluids. We plan experiments, numerical simulations and modelling of the fluid behavior from the basic interactions determining its microstructure.The project exploits highly accurate simulations and state-of-the-art experiments to study complex fluids behavior in complex geometries. Thixotropic elasto-viscoplastic model for structured fluids de Souza Mendes, Paulo R. Abstract. Publication: Soft Matter.