Simulation of viscoelastic and viscoelastoplastic die-swell flows

Al-Muslimawi, Alaa H.; Tamaddon-Jahromi, H.R.; Webster, M.F.

doi:10.1016/j.jnnfm.2012.08.004

Cited by 41 publications

(21 citation statements)

References 29 publications

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“…Thus, the extensional response also plays an important role in swelling process and should be taken into account when predicting the final swelling ratio. The simulation results in [21] demonstrate that flows with a sufficiently high elongational viscosity are able to swell to an apparently large state even at a relatively low flow rate, ignoring their performance in simple shear flows. Nevertheless, decreasing the viscosity ratio would lead to an increase in the recoverable shear and, in turn, increases the value of swelling ration according to (15).…”

Section: Validation Of Computational Model With Viscoelastic Fluidmentioning

confidence: 94%

A New Method to Simulate Free Surface Flows for Viscoelastic Fluid

Cao

Ren

Guo

et al. 2015

Advances in Materials Science and Engineering

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Free surface flows arise in a variety of engineering applications. To predict the dynamic characteristics of such problems, specific numerical methods are required to accurately capture the shape of free surface. This paper proposed a new method which combined the Arbitrary Lagrangian-Eulerian (ALE) technique with the Finite Volume Method (FVM) to simulate the time-dependent viscoelastic free surface flows. Based on an open source CFD toolbox called OpenFOAM, we designed an ALE-FVM free surface simulation platform. In the meantime, the die-swell flow had been investigated with our proposed platform to make a further analysis of free surface phenomenon. The results validated the correctness and effectiveness of the proposed method for free surface simulation in both Newtonian fluid and viscoelastic fluid.

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Section: Validation Of Computational Model With Viscoelastic Fluidmentioning

confidence: 94%

A New Method to Simulate Free Surface Flows for Viscoelastic Fluid

Cao

Ren

Guo

et al. 2015

Advances in Materials Science and Engineering

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“…Here, two sources of plastic behaviour are considered: (i) through the solvent viscosity, offered by Bingham-Papanastasiou model (Papanastasiou 1987;Mitsoulis 2007;Belblidia et al 2011;Al-Muslimawi et al 2013), and (ii) through the polymeric viscoelastic contribution, introduced via Bautista-Manero models (Bautista et al 1999;Manero et al 2002;Boek et al 2005;López-Aguilar et al 2014a, b). The class of BautistaManero models has been derived to represent the characteristics of thixotropic wormlike micellar systems.…”

Section: Introductionmentioning

confidence: 99%

“…This model has been successfully applied in a plethora of studies, to describe viscoplastic and viscoelastoplastic flows, in simple ideal and complex flow scenarios (Mitsoulis 2007). This would include a constitutive viscoelastoplastic model (as a combination of the Bingham viscoplastic and the Oldroyd viscoelastic models), which theoretically satisfies the second law of thermodynamics (Saramito 2007), entry-exit flows from dies, flow past objects and squeeze flows, steady Oldroyd-B 4:1:4 contraction-expansion flow (Belblidia et al 2011), and steady die-swell flow for exponential Phan-Thien-Tanner models (EPTT, viscoelastic, shear thinning, strain hardening/ softening;Al-Muslimawi et al 2013). Here, the conventional yielded-unyielded regions across the flow domain were studied.…”

Section: Introductionmentioning

confidence: 99%

“…Here, the conventional yielded-unyielded regions across the flow domain were studied. Additionally, in Belblidia et al (2011), vortex dynamics, excess pressure drop versus yield stress and enhancement with viscoelasticity were all reported, whilst in Al-Muslimawi et al (2013), swelling ratio and excess pressure loss received attention. Frigaard and Nouar (2005) presented a detailed analysis of the limitations of various regularisation schemes, including the Papanastasiou form.…”

Section: Introductionmentioning

confidence: 99%

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Numerical modelling of thixotropic and viscoelastoplastic materials in complex flows

et al. 2014

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This study is concerned with the finite element/finite volume (fe/fv) simulation of thixotropic and viscoelastoplastic material systems through two model approaches: (i) a new micellar thixotropic constitutive model for wormlike micellar systems (that introduces viscoelasticity into the network structure construction/destruction kinetic equation) and (ii) adopting a Bingham-Papanastasiou model. The computational approach is based on a hybrid parent/subcell scheme, which is cast about a semi-implicit incremental pressure correction (ipc) scheme. The appearance of plastic behaviour arises through the micellar polymeric viscosity, by increasing the zero-shear viscosity (low solvent fractions), whilst the Bingham-Papanastasiou introduces plastic features through the solvent viscosity. The characteristics of thixotropic wormlike micellar systems are represented through the class of Bautista-Manero models. Correction is incorporated, based on physical arguments for fluidity, in which absolute values of the dissipation function are adopted in complex flow, thereby accessing low-solvent fractions and high-elasticity levels. Considering elastic and plastic influences separately, solutions are compared and contrasted for contraction-expansion flow, identifying such flow field features as vortex dynamics, stress field structure, yield front patterns and enhanced pressure drop. Particular attention is paid to the influence of enhanced strain hardening that is introduced through stronger thixotropic structural features. Vortex activity decreases as either We is increased at a fixed τ 0 or τ 0 is increased at a fixed We. Exaggerated strainhardening properties are observed to have a major impact on vortex activity. Patterns and trends in normal stress difference fields reflect those in re-entrant corner vortex patterns. Yield front patterns are significantly influenced with yield stress τ 0 variation and more so than elevation in elasticity. Findings on excess pressure drop (epd) versus increased yield stress (τ 0 ) follow a linear trend. Consistently, it is evident that any variation that leads to a more solid-like behaviour produces epd enhancement. In addition, relatively more structured fluids display distinctly larger epd values throughout the τ 0 range covered.

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“…Our prior studies with kinetic networks/branched molecular structures models such as Phan-Thien/Tanner and pom-pom have shown encouraging results in the areas of flows past objects, filament-stretching, mixing and separating flows and extrusion drawing (Tamaddon-Jahromi 2011a, b;Tabatabaei et al 2015;Echendu et al 2011;Al-Muslimawi et al 2013).…”

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confidence: 99%

Modified Bautista–Manero (MBM) modelling for hyperbolic contraction–expansion flows

et al. 2015

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In this study, modelling of network-structured material flow is considered through a rounded-corner, hyperbolic 4:1:4 contraction-expansion geometry, under axisymmetric configuration. Three representative constitutive models are adopted to represent networked behaviour and to investigate the flow of wormlike micellar fluids in this context. This includes the modified Bautista-Manero (MBM) model (for base thixotropic properties), some newly proposed micellar models (NM_τ p and NM_T; for advanced thixotropic modelling), and the EPPT model (for contrast against non-thixotropic properties). In this configuration, emphasis is placed upon interpretation of flow behaviour for these constitutive models, against their response in simple rheometrical flows. To best determine the factors that contribute to epd prediction, current findings have also been contrasted against those reported earlier in López-Aguilar et al. (J Non-Newtonian Fluid Mech 204:7-21, 2014), for the counterpart abrupt rounded-corner, axisymmetric 4:1:4 contraction-expansion flow.

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Simulation of viscoelastic and viscoelastoplastic die-swell flows

Cited by 41 publications

References 29 publications

A New Method to Simulate Free Surface Flows for Viscoelastic Fluid

A New Method to Simulate Free Surface Flows for Viscoelastic Fluid

Numerical modelling of thixotropic and viscoelastoplastic materials in complex flows

Modified Bautista–Manero (MBM) modelling for hyperbolic contraction–expansion flows

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