# Artificial Thermal Ageing of Polyester Reinforced and - JoVE

Yield-stress fluids in porous media : a comparison of - DiVA

The constitutive structure of the fluid is described by a frame indifferent linear combination of the Modified Request PDF | Forced Convection of Elastoviscoplastic Fluids in Non-Circular Tubes | An analytical study of the forced convection of an elastoviscoplastic fluid in tubes of arbitrary cross section We present numerical simulations of laminar and turbulent channel flow of an elastoviscoplastic fluid. The non-Newtonian flow is simulated by solving the full incompressible Navier-Stokes equations coupled with the evolution equation for the elastoviscoplastic stress tensor. The laminar simulations are carried out for a wide range of Reynolds numbers, Bingham numbers and ratios of the fluid Some elasto-viscoplastic preliminary results obtained at the Laboratory of Applied and Computational Fluid Mechanics (LAMAC) from the Federal University of R (2020) Chaparian et al. Meccanica. 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 similarities between these two classes of flows.

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By increasing the yield stress,thedifferenceinthepressuredropsbetweenthe two classes of ﬂows becomes smaller and smaller for both considered geometries. 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. 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.

## ICMM6 26-28 June 2019 · Indico

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. �10.1016/j.jnnfm.2008.12.001�. �hal Elastoviscoplastic behavior model of electrorheological fluids in various deformation modes E V Korobko1, M A Zhurauski and A A Makhaniok A.V. Luikov Heat and Mass Transfer Institute of NAS Belarus, 220072, 15 P. Brovka str., Minsk, Belarus E-mail: evkorobko@gmail.com Abstract.

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Thixotropic elasto-viscoplastic model for structured fluids de Souza Mendes, Paulo R. Abstract. Publication: Soft Matter. Pub Date: 2011 DOI: 10.1039/c0sm01021a Paper Review: Saramito, P., “A new constitutive equation for elastoviscoplastic fluid flows” and Saramito, P., “A new elastoviscoplastic model based on the Herschel-Bulkley We present a theoretical and computational study of thixotropic yield-stress materials in cylindrical Couette flows using a novel fluidity-based constitutive model introduced by de Souza Mendes et Oscillations of small bubbles and medium yielding in elastoviscoplastic fluids. File Description Size Format ; PhysRevFluids.4.073301.pdf: Published version: 1.6 MB Lattice strains and textures in the polycrystalline sample are recorded using in-situ synchrotron x-ray diffraction and are modeled with Elasto-Viscoplastic Self Consistent (EVPSC) methods. Parameters such as critical resolved shear stress (CRSS) for the various slip systems, strain hardening, initial grain shape, and the strength of the grain–neighborhood interaction are tested in order to For elastoviscoplastic materials undergoing LAOS in these geometries, both elastic but flexible model that is popular for use with fluids that exhibit a yield stress.

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.

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In the present work, an advanced elasto-viscoplastic self-consistent model is used to 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 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. Fluid Mech. 158, 154 (2009)]. Assuming that the bubble remains spherical during Lattice strains and textures in the polycrystalline sample are recorded using in-situ synchrotron x-ray diffraction and are modeled with Elasto-Viscoplastic Self Consistent (EVPSC) methods. Parameters such as critical resolved shear stress (CRSS) for the various slip systems, strain hardening, initial grain shape, and the strength of the grain–neighborhood interaction are tested in order to Viscoplastic fluids: from theory to application (VPF2009), Limassol, Cyprus, 1–5 November, 2009 yield stress responses in elastoviscoplastic materials.

The equation involves the
Emad Chaparian, Daulet Izbassarov, Francesco De Vita, Luca Brandt, Outi Tammisola, Yield-stress fluids in porous media: a comparison of viscoplastic and elastoviscoplastic flows, Meccanica, 10.1007/s11012-019-01010-6, (2019).

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### Outi Tammisolas publikationer - KTH

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.

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### Outi Tammisolas publikationer - KTH

Elastoviscoplastic (EVP) fluids can be found in geophysical applications, such as mudslides and the tectonic dynamic of the Earth.