Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids

López-Aguilar, J.E.; Webster, M.F.; Tamaddon-Jahromi, H.R.; Manero, O.; Webster, Michael; Tamaddon-Jahromi, Hamid

doi:10.1016/j.jnnfm.2018.09.001

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Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids

J.E. López-Aguilar, M.F. Webster, H.R. Tamaddon-Jahromi, O. Manero, Michael Webster

, Hamid Tamaddon-Jahromi

Journal of Non-Newtonian Fluid Mechanics, Volume: 261, Pages: 188 - 210

Swansea University Authors: Michael Webster , Hamid Tamaddon-Jahromi

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DOI (Published version): 10.1016/j.jnnfm.2018.09.001

Abstract

In this predominately predictive modelling finite volume/element study, a comparative analysis is performed for time-dependent and viscoelastoplastic flow in a circular contraction-expansion geometry of aspect-ratio 10:1:10. For this, a hybrid finite volume/element scheme is employed. A new and revi...

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Published in:	Journal of Non-Newtonian Fluid Mechanics
ISSN:	0377-0257
Published:	2018
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URI:	https://cronfa.swan.ac.uk/Record/cronfa44624
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first_indexed	2018-09-26T13:00:01Z
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spelling	2018-11-19T15:37:25.7959279 v2 44624 2018-09-26 Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false b3a1417ca93758b719acf764c7ced1c5 Hamid Tamaddon-Jahromi Hamid Tamaddon-Jahromi true false 2018-09-26 EEN In this predominately predictive modelling finite volume/element study, a comparative analysis is performed for time-dependent and viscoelastoplastic flow in a circular contraction-expansion geometry of aspect-ratio 10:1:10. For this, a hybrid finite volume/element scheme is employed. A new and revised micellar model is investigated, under the denomination of BMP+_τp, which reflects a bounded extensional viscosity response and an N1Shear-upturn at large deformation rates (lost in earlier model-variants), a versatile model capable of supporting plasticity, shear-thinning, strain softening-hardening and shear-banding. Many of these features are common to wormlike micellar and polymer solutions. Then, findings are contrasted against a de Souza Mendes model. Two flow regimes are addressed: plastic flow (low flow-rate Q ≤ 1 units, solvent-fraction β < 10−1) and viscoelastic flow (larger-Q > 1; minimised plasticity; β = 1/9); as quantified via flow-structure, yield-fronts and pressure-drops. Under the plastic regime, elasticity-increase causes asymmetry about the contraction-plane, whilst yield-stress and enhanced strain-hardening promote solid-like features, apparent through augmented unyielded-regions and rising pressure-drops. Concerning the viscoelastic regime and vortex-structures, extensional-deformation experienced correlates with hardening expectation in uniaxial-extension, whilst streamline activity in vortex-cells correlates with normal-stress response in shear. Adjustment in strain-hardening/softening response with Q-rise, provides translation from weaker salient-corner vortex centres to stronger elastic corner-vortices; yet, when softening finally prevails, asymmetric upstream/downstream salient-corners vortex patterns are recovered. For strong-hardening and solvent-dominated β∼0.8 fluids (as with Boger fluids), an intermediate lip-vortex-formation phase is noted, alongside coexistence of salient-corner vortices. Such a vortex-coexistence phase is distinctly absent in solute-concentrated fluids. Journal Article Journal of Non-Newtonian Fluid Mechanics 261 188 210 0377-0257 30 11 2018 2018-11-30 10.1016/j.jnnfm.2018.09.001 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2018-11-19T15:37:25.7959279 2018-09-26T12:40:28.8697405 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised J.E. López-Aguilar 1 M.F. Webster 2 H.R. Tamaddon-Jahromi 3 O. Manero 4 Michael Webster 0000-0002-7722-821X 5 Hamid Tamaddon-Jahromi 6 0044624-26092018124948.pdf lopez-aguilar2018.pdf 2018-09-26T12:49:48.7370000 Output 7202201 application/pdf Accepted Manuscript true 2019-09-06T00:00:00.0000000 true eng
title	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids
spellingShingle	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids Michael Webster Hamid Tamaddon-Jahromi
title_short	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids
title_full	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids
title_fullStr	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids
title_full_unstemmed	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids
title_sort	Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids
author_id_str_mv	b6a811513b34d56e66489512fc2c6c61 b3a1417ca93758b719acf764c7ced1c5
author_id_fullname_str_mv	b6a811513b34d56e66489512fc2c6c61_*_Michael Webster b3a1417ca93758b719acf764c7ced1c5_*_Hamid Tamaddon-Jahromi
author	Michael Webster Hamid Tamaddon-Jahromi
author2	J.E. López-Aguilar M.F. Webster H.R. Tamaddon-Jahromi O. Manero Michael Webster Hamid Tamaddon-Jahromi
format	Journal article
container_title	Journal of Non-Newtonian Fluid Mechanics
container_volume	261
container_start_page	188
publishDate	2018
institution	Swansea University
issn	0377-0257
doi_str_mv	10.1016/j.jnnfm.2018.09.001
college_str	Faculty of Science and Engineering
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description	In this predominately predictive modelling finite volume/element study, a comparative analysis is performed for time-dependent and viscoelastoplastic flow in a circular contraction-expansion geometry of aspect-ratio 10:1:10. For this, a hybrid finite volume/element scheme is employed. A new and revised micellar model is investigated, under the denomination of BMP+_τp, which reflects a bounded extensional viscosity response and an N1Shear-upturn at large deformation rates (lost in earlier model-variants), a versatile model capable of supporting plasticity, shear-thinning, strain softening-hardening and shear-banding. Many of these features are common to wormlike micellar and polymer solutions. Then, findings are contrasted against a de Souza Mendes model. Two flow regimes are addressed: plastic flow (low flow-rate Q ≤ 1 units, solvent-fraction β < 10−1) and viscoelastic flow (larger-Q > 1; minimised plasticity; β = 1/9); as quantified via flow-structure, yield-fronts and pressure-drops. Under the plastic regime, elasticity-increase causes asymmetry about the contraction-plane, whilst yield-stress and enhanced strain-hardening promote solid-like features, apparent through augmented unyielded-regions and rising pressure-drops. Concerning the viscoelastic regime and vortex-structures, extensional-deformation experienced correlates with hardening expectation in uniaxial-extension, whilst streamline activity in vortex-cells correlates with normal-stress response in shear. Adjustment in strain-hardening/softening response with Q-rise, provides translation from weaker salient-corner vortex centres to stronger elastic corner-vortices; yet, when softening finally prevails, asymmetric upstream/downstream salient-corners vortex patterns are recovered. For strong-hardening and solvent-dominated β∼0.8 fluids (as with Boger fluids), an intermediate lip-vortex-formation phase is noted, alongside coexistence of salient-corner vortices. Such a vortex-coexistence phase is distinctly absent in solute-concentrated fluids.
published_date	2018-11-30T03:55:55Z
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score	11.012678

Predictions for circular contraction-expansion flows with viscoelastoplastic & thixotropic fluids

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