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On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures

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

Journal of Non-Newtonian Fluid Mechanics

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

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DOI (Published version): 10.1016/j.jnnfm.2017.11.006

Abstract

This study compares and contrasts computational predictions against experimental data for some viscoelastic contraction flows. Nigen and Walters (2002) [1], provides the comparative data-set, the specific flow of interest is an 8:1 abrupt circular contraction, and the constitutive model is that of s...

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Published in: Journal of Non-Newtonian Fluid Mechanics
ISSN: 0377-0257
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa37028
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first_indexed 2017-11-23T14:05:18Z
last_indexed 2020-06-03T18:50:15Z
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spelling 2020-06-03T14:19:20.6344382 v2 37028 2017-11-23 On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false b3a1417ca93758b719acf764c7ced1c5 Hamid Tamaddon-Jahromi Hamid Tamaddon-Jahromi true false 2017-11-23 EEN This study compares and contrasts computational predictions against experimental data for some viscoelastic contraction flows. Nigen and Walters (2002) [1], provides the comparative data-set, the specific flow of interest is an 8:1 abrupt circular contraction, and the constitutive model is that of swanINNFM(q) [swIM]. Taken against increasing flow-rate, such a model is observed to capture significant vortex-enhancement in these axisymmetric flows, reflecting well the counterpart experimental findings. In addition, rich vortex characteristics are reflected, through evolving patterns of salient-corner, lip-vortex and elastic-corner vortices. A systematic parametric analysis is conducted over three independent and governing material parameters in the model, whilst attempting to interpret rheological adjustment against such changes in flow-structure. Specifically, this has involved variation in solvent-fraction (β), finite-extensibility parameter (L), and extensional-based dissipative parameter (λD). Journal Article Journal of Non-Newtonian Fluid Mechanics 0377-0257 Experimental data vs numerical predictions; Boger fluids; flow-structure and pressure-drop; circular contraction flow; lip-, salient- and elastic-corner vortices; swIM model 31 12 2017 2017-12-31 10.1016/j.jnnfm.2017.11.006 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-06-03T14:19:20.6344382 2017-11-23T11:02:27.3054145 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised H.R. Tamaddon-Jahromi 1 J.E. López-Aguilar 2 M.F. Webster 3 Michael Webster 0000-0002-7722-821X 4 Hamid Tamaddon-Jahromi 5 0037028-23112017110541.pdf tamaddon-jahromi2017.pdf 2017-11-23T11:05:41.7030000 Output 4276212 application/pdf Accepted Manuscript true 2018-11-21T00:00:00.0000000 false eng
title On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
spellingShingle On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
Michael Webster
Hamid Tamaddon-Jahromi
title_short On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
title_full On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
title_fullStr On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
title_full_unstemmed On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
title_sort On modelling viscoelastic flow through abrupt circular 8:1 contractions – matching experimental pressure-drops and vortex structures
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 H.R. Tamaddon-Jahromi
J.E. López-Aguilar
M.F. Webster
Michael Webster
Hamid Tamaddon-Jahromi
format Journal article
container_title Journal of Non-Newtonian Fluid Mechanics
publishDate 2017
institution Swansea University
issn 0377-0257
doi_str_mv 10.1016/j.jnnfm.2017.11.006
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 1
active_str 0
description This study compares and contrasts computational predictions against experimental data for some viscoelastic contraction flows. Nigen and Walters (2002) [1], provides the comparative data-set, the specific flow of interest is an 8:1 abrupt circular contraction, and the constitutive model is that of swanINNFM(q) [swIM]. Taken against increasing flow-rate, such a model is observed to capture significant vortex-enhancement in these axisymmetric flows, reflecting well the counterpart experimental findings. In addition, rich vortex characteristics are reflected, through evolving patterns of salient-corner, lip-vortex and elastic-corner vortices. A systematic parametric analysis is conducted over three independent and governing material parameters in the model, whilst attempting to interpret rheological adjustment against such changes in flow-structure. Specifically, this has involved variation in solvent-fraction (β), finite-extensibility parameter (L), and extensional-based dissipative parameter (λD).
published_date 2017-12-31T03:46:32Z
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score 11.017062

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