# Outi Tammisolas publikationer - KTH

ICMM6 26-28 June 2019 · Indico

The constitutive structure of the fluid is described by a linear frame invariant combination of the Phan-Thien−Tanner model of viscoelastic fluids and the Bingham model of plastic fluids. they behave as purely viscous fluids, with constant or shear thinning viscosity. Viscoplastic fluids can present elasticity and thixotropy. 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.

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. (b) Inappropriate constitutive models have often been used, i.e., generalized Newtonian fluid tic fluid models are more complicated than viscoplastic or viscoelastic one. The elaboration of constitutive equations for such materials requires some precaution elasto-viscoplastic instability, which is at variance with elasto-plastic inviscid media.

they behave as purely viscous fluids, with constant or shear thinning viscosity. Viscoplastic fluids can present elasticity and thixotropy.

## ICMM6 26-28 June 2019 · Indico

The non-Newtonian flow is simulated by | Find, read and cite all the research you A constitutive model for elasto-viscoplastic thixotropic materials is proposed. It consists of two differential equations, one for the stress and the other for the structure parameter, a scalar quantity that indicates the structuring level of the microstructure. In contrast to previous models of this kind, the structure parameter varies from zero to a positive and typically large number. The Originally it was believed that YS materials are just generalized Newtonian fluids, i.e.

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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. (b) Inappropriate constitutive models have often been used, i.e., generalized Newtonian fluid tic fluid models are more complicated than viscoplastic or viscoelastic one. The elaboration of constitutive equations for such materials requires some precaution elasto-viscoplastic instability, which is at variance with elasto-plastic inviscid media.

Despite the numerous studies performed to analyse viscoelastic turbulent flows, much less attention has been given to viscoplastic and elastoviscoplastic fluids. Various fluids of practical interest, such as liquid foams, droplet emulsions or blood, present such elastoviscoplastic behavior: at low stress, the material behaves as a viscoelastic solid, whereas at stresses above a yield stress, the material behaves as a fluid. Yet, the velocity fields in the viscoplastic and elastoviscoplastic flows are comparable for small elastic effects.

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When the elastic effects increase, the elastoviscoplastic ﬂow becomes time- In this work, we solve the full Cauchy equations governing the inertial flows of a viscoplastic fluid (Bingham model) and elastoviscoplastic fluid (Saramito model). The focus is on the motion of a yield-stress fluid through a solid matrix (model porous media). Our paper has two main objectives. We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows.

The dynamics of a single elastoviscoplastic drop immersed in plane shear ﬂow of a Newtonian ﬂuid is studied by three-dimensional direct numerical simulations using a ﬁnite-difference and level-set method combined with the Saramito model for the elasto-viscoplastic ﬂuid. 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.

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A new elastoviscoplastic model based on the Herschel-Bulkley viscoplastic model. Journal of Non-Newtonian Fluid Mechanics, Elsevier, 2009, 158 (1-3), pp.154-161.

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### töjningshastighetstensor — Engelska översättning - TechDico

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.

## Doctoral students in simulations and experiments with

Meccanica.

We focus on viscoplastic and elastoviscoplastic flows to reveal some differences and similarities between these two classes of flows. Small elastic effects increase the pressure drop and also the size of unyielded regions in the flow which is the consequence of different stress solutions compare to viscoplastic flows. A numerical and theoretical study of yield-stress fluid flows in two types of model porous media is presented.