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A comparative numerical study of time-dependent structured fluids in complex flows

J. Esteban López-Aguilar, Michael Webster Orcid Logo, Hamid Tamaddon-Jahromi, Octavio Manero

Rheologica Acta, Volume: 55, Issue: 3, Pages: 197 - 214

Swansea University Authors: Michael Webster Orcid Logo, Hamid Tamaddon-Jahromi

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DOI (Published version): 10.1007/s00397-015-0908-1

Abstract

This study is concerned with the modelling of thixotropic and viscoelastoplastic material systems, contrasting two approaches in the development of such constitutive models. Accordingly, departure from Oldroyd-B-like behaviour is engineered through, first, a new micellar viscoelastic-thixotropic mod...

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Published in: Rheologica Acta
Published: 2016
URI: https://cronfa.swan.ac.uk/Record/cronfa27557
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spelling 2016-10-06T14:12:19.6774701 v2 27557 2016-04-29 A comparative numerical study of time-dependent structured fluids in complex flows b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false b3a1417ca93758b719acf764c7ced1c5 Hamid Tamaddon-Jahromi Hamid Tamaddon-Jahromi true false 2016-04-29 EEN This study is concerned with the modelling of thixotropic and viscoelastoplastic material systems, contrasting two approaches in the development of such constitutive models. Accordingly, departure from Oldroyd-B-like behaviour is engineered through, first, a new micellar viscoelastic-thixotropic model (NM_p_ABS), under the Bautista-Manero framework, and second, a De Souza model. This NM_p_ABS model, is based on the energy dissipated by a micellar material to change its internal structure, whilst equivalently, the De Souza model employs the second invariant of stress. These models are compared and contrasted in their response through counterpart numerical solutions for axisymmetric contraction-expansion flow. Here, solution features of yielded-unyielded regions, total pressure drop, stress fields and vortex dynamics are analysed under scaling based on the second-Newtonian viscosity-plateau (s). With the NM_p_ABS model, yield stress features are identified through solvent-fraction -variation. In contrast for the De Souza model, counterpart yield-stress features are exposed through yield-stress d-variation. With either yield-stress increase or rise in elasticity, NM_p_ABS solution response appears symmetrical about the contraction-plane axis, whilst De Souza patterns prove asymmetrical. Under solvent-fraction decrease, NM_p_ABS response provides yielded-region shrinkage, upstream and downstream vortex suppression, and non-zero N1-region growth. Moreover under elasticity rise, fading non-zero N1-regions, size-invariant yield-fronts and non-zero N1-regions are observed. In contrast under d increase or rise in elasticity, De Souza solutions manifest enhancement in vortex activity, and non-zero N1-region-intensification and expansion. Furthermore, d-rise provokes De Souza yielded-region shrinkage, whilst elasticity does the opposite. On total pressure-drop (Δp), for NM_p_ABS and with polymeric-fraction increase at fixed Wi, both monotonic rise at low-Wi and decline at higher-Wi are gathered. In contrast, only a monotonic rising trend is recorded with De Souza Δp-solutions for fixed Wi under 0d-rise. Furthermore, with Wi-rise and at any fixed 0eff-level, both models concur in a declining Δp-trend. Journal Article Rheologica Acta 55 3 197 214 Yield fronts, yield stress, wormlike micelles, Bautista-Manero &amp; De Souza models, hybrid finite element/volume method, enhanced oil-recovery, thixotropy 31 3 2016 2016-03-31 10.1007/s00397-015-0908-1 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2016-10-06T14:12:19.6774701 2016-04-29T12:12:00.3920936 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised J. Esteban López-Aguilar 1 Michael Webster 0000-0002-7722-821X 2 Hamid Tamaddon-Jahromi 3 Octavio Manero 4
title A comparative numerical study of time-dependent structured fluids in complex flows
spellingShingle A comparative numerical study of time-dependent structured fluids in complex flows
Michael Webster
Hamid Tamaddon-Jahromi
title_short A comparative numerical study of time-dependent structured fluids in complex flows
title_full A comparative numerical study of time-dependent structured fluids in complex flows
title_fullStr A comparative numerical study of time-dependent structured fluids in complex flows
title_full_unstemmed A comparative numerical study of time-dependent structured fluids in complex flows
title_sort A comparative numerical study of time-dependent structured fluids in complex flows
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. Esteban López-Aguilar
Michael Webster
Hamid Tamaddon-Jahromi
Octavio Manero
format Journal article
container_title Rheologica Acta
container_volume 55
container_issue 3
container_start_page 197
publishDate 2016
institution Swansea University
doi_str_mv 10.1007/s00397-015-0908-1
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
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description This study is concerned with the modelling of thixotropic and viscoelastoplastic material systems, contrasting two approaches in the development of such constitutive models. Accordingly, departure from Oldroyd-B-like behaviour is engineered through, first, a new micellar viscoelastic-thixotropic model (NM_p_ABS), under the Bautista-Manero framework, and second, a De Souza model. This NM_p_ABS model, is based on the energy dissipated by a micellar material to change its internal structure, whilst equivalently, the De Souza model employs the second invariant of stress. These models are compared and contrasted in their response through counterpart numerical solutions for axisymmetric contraction-expansion flow. Here, solution features of yielded-unyielded regions, total pressure drop, stress fields and vortex dynamics are analysed under scaling based on the second-Newtonian viscosity-plateau (s). With the NM_p_ABS model, yield stress features are identified through solvent-fraction -variation. In contrast for the De Souza model, counterpart yield-stress features are exposed through yield-stress d-variation. With either yield-stress increase or rise in elasticity, NM_p_ABS solution response appears symmetrical about the contraction-plane axis, whilst De Souza patterns prove asymmetrical. Under solvent-fraction decrease, NM_p_ABS response provides yielded-region shrinkage, upstream and downstream vortex suppression, and non-zero N1-region growth. Moreover under elasticity rise, fading non-zero N1-regions, size-invariant yield-fronts and non-zero N1-regions are observed. In contrast under d increase or rise in elasticity, De Souza solutions manifest enhancement in vortex activity, and non-zero N1-region-intensification and expansion. Furthermore, d-rise provokes De Souza yielded-region shrinkage, whilst elasticity does the opposite. On total pressure-drop (Δp), for NM_p_ABS and with polymeric-fraction increase at fixed Wi, both monotonic rise at low-Wi and decline at higher-Wi are gathered. In contrast, only a monotonic rising trend is recorded with De Souza Δp-solutions for fixed Wi under 0d-rise. Furthermore, with Wi-rise and at any fixed 0eff-level, both models concur in a declining Δp-trend.
published_date 2016-03-31T03:33:26Z
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score 10.998228

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