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Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows

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

Journal of Non-Newtonian Fluid Mechanics, Volume: 232, Pages: 55 - 66

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

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DOI (Published version): 10.1016/j.jnnfm.2016.03.004

Abstract

This study is concerned with finite element/volume modelling of contraction-expansion axisymmetric pipe flows for thixotropic and non-thixotropic viscoelastic models. To obtain solutions at high Weissenberg numbers (Wi) under a general differential form , both thixotropic Bautista-Manero micellar an...

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Published in: Journal of Non-Newtonian Fluid Mechanics
Published: 2016
URI: https://cronfa.swan.ac.uk/Record/cronfa27006
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spelling 2018-11-19T15:25:26.6560689 v2 27006 2016-03-31 Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false b3a1417ca93758b719acf764c7ced1c5 Hamid Tamaddon-Jahromi Hamid Tamaddon-Jahromi true false 2016-03-31 EEN This study is concerned with finite element/volume modelling of contraction-expansion axisymmetric pipe flows for thixotropic and non-thixotropic viscoelastic models. To obtain solutions at high Weissenberg numbers (Wi) under a general differential form , both thixotropic Bautista-Manero micellar and non-thixotropic EPTT f-functionals have been investigated. Here, three key modifications have been implemented: first, that of convoluting EPTT and micellar Bautista-Manero f-functionals, either in a multiplicative (Conv*) or additive (Conv+) form; second, by adopting f-functionals in absolute form (ABS-f-correction); and third, by imposing pure uniaxial-extension velocity-gradient components at the pure-stretch flow-centreline (VGR-correction). With this combination of strategies, highly non-linear solutions have been obtained to impressively high Wi [=O(5000+)].This capability permits analysis of industrial applications, typically displaying non-linear features such as thixotropy, yield stress and shear banding. The scope of applications covers enhanced oil- recovery, industrial processing of plastics and foods, as well as in biological and microfluidic flows. The impact of rheological properties across convoluted models (moderate-hardening, shear-thinning) has been observed through steady-state solutions and their excess pressure-drop (epd) production, stress, f-functional field structure, and vortex dynamics. Three phases of vortex-behaviour have been observed with rise in elasticity, along with upstream-downstream Moffatt vortices and plateauing epd-behaviour at high-Wi levels. Moreover, enhancement of positive-definiteness in stress has improved high-Wi solution attenuation. Journal Article Journal of Non-Newtonian Fluid Mechanics 232 55 66 High-elasticity solutions, wormlike micelles, convoluted EPTT-Bautista-Manero models, numerical simulation, hybrid finite element/volume method, enhanced oil-recovery 30 6 2016 2016-06-30 10.1016/j.jnnfm.2016.03.004 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2018-11-19T15:25:26.6560689 2016-03-31T15:41:01.1660196 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 0027006-31032016154113.pdf 1-s2.0-S0377025716300052-main.pdf 2016-03-31T15:41:13.8330000 Output 3248521 application/pdf Accepted Manuscript true 2017-03-12T00:00:00.0000000 © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ true
title Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows
spellingShingle Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows
Michael Webster
Hamid Tamaddon-Jahromi
title_short Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows
title_full Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows
title_fullStr Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows
title_full_unstemmed Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion flows
title_sort Convoluted models & high-Weissenberg predictions for micellar thixotropic fluids in contraction-expansion 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.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 232
container_start_page 55
publishDate 2016
institution Swansea University
doi_str_mv 10.1016/j.jnnfm.2016.03.004
college_str Faculty of Science and Engineering
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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 1
active_str 0
description This study is concerned with finite element/volume modelling of contraction-expansion axisymmetric pipe flows for thixotropic and non-thixotropic viscoelastic models. To obtain solutions at high Weissenberg numbers (Wi) under a general differential form , both thixotropic Bautista-Manero micellar and non-thixotropic EPTT f-functionals have been investigated. Here, three key modifications have been implemented: first, that of convoluting EPTT and micellar Bautista-Manero f-functionals, either in a multiplicative (Conv*) or additive (Conv+) form; second, by adopting f-functionals in absolute form (ABS-f-correction); and third, by imposing pure uniaxial-extension velocity-gradient components at the pure-stretch flow-centreline (VGR-correction). With this combination of strategies, highly non-linear solutions have been obtained to impressively high Wi [=O(5000+)].This capability permits analysis of industrial applications, typically displaying non-linear features such as thixotropy, yield stress and shear banding. The scope of applications covers enhanced oil- recovery, industrial processing of plastics and foods, as well as in biological and microfluidic flows. The impact of rheological properties across convoluted models (moderate-hardening, shear-thinning) has been observed through steady-state solutions and their excess pressure-drop (epd) production, stress, f-functional field structure, and vortex dynamics. Three phases of vortex-behaviour have been observed with rise in elasticity, along with upstream-downstream Moffatt vortices and plateauing epd-behaviour at high-Wi levels. Moreover, enhancement of positive-definiteness in stress has improved high-Wi solution attenuation.
published_date 2016-06-30T03:32:38Z
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score 11.012678

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