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Numerical modeling of thixotropic and viscoelastoplastic materials in complex flows
Rheologica Acta, Volume: 54, Issue: 4, Pages: 307 - 325
Swansea University Authors: Michael Webster , Hamid Tamaddon-Jahromi
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DOI (Published version): 10.1007/s00397-014-0810-2
This study is concerned with the numerical modelling of thixotropic and viscoelastoplastic material systems through two approaches: (i) a new micellar thixotropic constitutive model for worm-like micellar systems that introduces viscoelasticity into the network-structure construction/destruction kin...
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This study is concerned with the numerical modelling of thixotropic and viscoelastoplastic material systems through two approaches: (i) a new micellar thixotropic constitutive model for worm-like micellar systems that introduces viscoelasticity into the network-structure construction/destruction kinetic equation; and (ii) adopting a Bingham-Papanastasiou model. 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 worm-like 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 influence 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. The computational approach is based on a hybrid parent finite element/child finite volume (fe/fv) scheme, which is cast about a semi-implicit incremental pressure-correction (ipc) scheme.
yield fronts, yield stress, wormlike micelles, Bautista-Manero models, hybrid finite element/volume method, enhanced oil-recovery, Papanastasiou regularisation
Faculty of Science and Engineering