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Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models

I.E. Garduño, H.R. Tamaddon-Jahromi, M.F. Webster, Michael Webster Orcid Logo, Hamid Tamaddon Jahromi

Journal of Non-Newtonian Fluid Mechanics, Volume: 244, Pages: 25 - 41

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

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DOI (Published version): 10.1016/j.jnnfm.2017.04.002

Abstract

This article tackles the topic of drag detection for flow past a sphere, focusing on response for viscoelastic shear-thinning fluids, in contrast to constant shear-viscosity forms, both with and without extensional-viscous dissipative contributions. The work extends that previously of Garduño et al....

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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/cronfa33021
first_indexed 2017-04-24T13:04:54Z
last_indexed 2018-02-09T05:21:35Z
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spelling 2017-06-19T15:31:25.2881925 v2 33021 2017-04-24 Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models b6a811513b34d56e66489512fc2c6c61 0000-0002-7722-821X Michael Webster Michael Webster true false b3a1417ca93758b719acf764c7ced1c5 Hamid Tamaddon Jahromi Hamid Tamaddon Jahromi true false 2017-04-24 This article tackles the topic of drag detection for flow past a sphere, focusing on response for viscoelastic shear-thinning fluids, in contrast to constant shear-viscosity forms, both with and without extensional-viscous dissipative contributions. The work extends that previously of Garduño et al. [1], where experimental levels of resultant drag-enhancement were captured for Boger-fluids, using a new hybrid dissipative viscoelastic model. This advance was based on Finitely Extensible Non-linear Elastic and White-Metzner constructs, where the level of extensional-viscous material time-scale had to be considerably raised to provide strong strain-hardening properties. The new dissipative model drag findings are: - for low-solvent systems, all such models reflect only significant drag-reduction, with barely any distinction from base-level dissipative-factor response. Such systems consistently gave considerably more pronounced decline in drag than for their high-solvent counterparts. Alternatively, under high-solvent systems (as in Boger fluids), the general observation for all four such dissipative models, is that after an initial-decrease in drag, a second-increasing trend can be extracted. This lies in stark contrast to base-level, null dissipative-factor drag findings, where only drag-reduction could be observed. Yet consistently, the inclusion of shear-thinning is reflected in the overall lowering of drag levels. Nevertheless, strong terminating drag-enhancement can be generated under larger dissipative-factor setting for dissipative-EPTT (shear-thinning, strain-hardening/softening), only slightly suppressed from that for dissipative-FENE-CR (constant shear-viscosity, strain-hardening/hardening-plateau). Other dissipative-{FENE-P, LPTT} variants, showed encouraging trends towards drag-enhancement, but unfortunately suffered from premature solution stunting, and hence, were restricted in accessible range of deformation-rates. In addition, an increase in geometry aspect-ratio, generally provokes elevation of drag, but only under high-solvent state, and hence only then, leads to evidence for stimulating drag-enhancement. Journal Article Journal of Non-Newtonian Fluid Mechanics 244 25 41 0377-0257 Flow past a sphere; Boger fluid; Shear-thinning fluid; Dissipative time-scale; swanINNFM(q)-model 31 12 2017 2017-12-31 10.1016/j.jnnfm.2017.04.002 COLLEGE NANME COLLEGE CODE Swansea University 2017-06-19T15:31:25.2881925 2017-04-24T11:04:07.1974204 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised I.E. Garduño 1 H.R. Tamaddon-Jahromi 2 M.F. Webster 3 Michael Webster 0000-0002-7722-821X 4 Hamid Tamaddon Jahromi 5 0033021-24042017110636.pdf garduno2017.pdf 2017-04-24T11:06:36.2870000 Output 2733735 application/pdf Accepted Manuscript true 2018-04-12T00:00:00.0000000 true eng
title Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
spellingShingle Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
Michael Webster
Hamid Tamaddon Jahromi
title_short Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
title_full Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
title_fullStr Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
title_full_unstemmed Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
title_sort Flow past a sphere: Predicting enhanced drag with shear-thinning fluids, dissipative and constant shear-viscosity models
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 I.E. Garduño
H.R. Tamaddon-Jahromi
M.F. Webster
Michael Webster
Hamid Tamaddon Jahromi
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container_title Journal of Non-Newtonian Fluid Mechanics
container_volume 244
container_start_page 25
publishDate 2017
institution Swansea University
issn 0377-0257
doi_str_mv 10.1016/j.jnnfm.2017.04.002
college_str Faculty of Science and Engineering
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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
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description This article tackles the topic of drag detection for flow past a sphere, focusing on response for viscoelastic shear-thinning fluids, in contrast to constant shear-viscosity forms, both with and without extensional-viscous dissipative contributions. The work extends that previously of Garduño et al. [1], where experimental levels of resultant drag-enhancement were captured for Boger-fluids, using a new hybrid dissipative viscoelastic model. This advance was based on Finitely Extensible Non-linear Elastic and White-Metzner constructs, where the level of extensional-viscous material time-scale had to be considerably raised to provide strong strain-hardening properties. The new dissipative model drag findings are: - for low-solvent systems, all such models reflect only significant drag-reduction, with barely any distinction from base-level dissipative-factor response. Such systems consistently gave considerably more pronounced decline in drag than for their high-solvent counterparts. Alternatively, under high-solvent systems (as in Boger fluids), the general observation for all four such dissipative models, is that after an initial-decrease in drag, a second-increasing trend can be extracted. This lies in stark contrast to base-level, null dissipative-factor drag findings, where only drag-reduction could be observed. Yet consistently, the inclusion of shear-thinning is reflected in the overall lowering of drag levels. Nevertheless, strong terminating drag-enhancement can be generated under larger dissipative-factor setting for dissipative-EPTT (shear-thinning, strain-hardening/softening), only slightly suppressed from that for dissipative-FENE-CR (constant shear-viscosity, strain-hardening/hardening-plateau). Other dissipative-{FENE-P, LPTT} variants, showed encouraging trends towards drag-enhancement, but unfortunately suffered from premature solution stunting, and hence, were restricted in accessible range of deformation-rates. In addition, an increase in geometry aspect-ratio, generally provokes elevation of drag, but only under high-solvent state, and hence only then, leads to evidence for stimulating drag-enhancement.
published_date 2017-12-31T04:02:49Z
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score 11.039009

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