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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
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The work extends that previously of Gardu&#xF1;o 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.</abstract><type>Journal Article</type><journal>Journal of Non-Newtonian Fluid Mechanics</journal><volume>244</volume><paginationStart>25</paginationStart><paginationEnd>41</paginationEnd><publisher/><issnPrint>0377-0257</issnPrint><keywords>Flow past a sphere; Boger fluid; Shear-thinning fluid; Dissipative time-scale; swanINNFM(q)-model</keywords><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2017</publishedYear><publishedDate>2017-12-31</publishedDate><doi>10.1016/j.jnnfm.2017.04.002</doi><url/><notes/><college>COLLEGE NANME</college><department>Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>EEN</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2017-06-19T15:31:25.2881925</lastEdited><Created>2017-04-24T11:04:07.1974204</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Uncategorised</level></path><authors><author><firstname>I.E.</firstname><surname>Gardu&#xF1;o</surname><order>1</order></author><author><firstname>H.R.</firstname><surname>Tamaddon-Jahromi</surname><order>2</order></author><author><firstname>M.F.</firstname><surname>Webster</surname><order>3</order></author><author><firstname>Michael</firstname><surname>Webster</surname><orcid>0000-0002-7722-821X</orcid><order>4</order></author><author><firstname>Hamid</firstname><surname>Tamaddon-Jahromi</surname><order>5</order></author></authors><documents><document><filename>0033021-24042017110636.pdf</filename><originalFilename>garduno2017.pdf</originalFilename><uploaded>2017-04-24T11:06:36.2870000</uploaded><type>Output</type><contentLength>2733735</contentLength><contentType>application/pdf</contentType><version>Accepted Manuscript</version><cronfaStatus>true</cronfaStatus><embargoDate>2018-04-12T00:00:00.0000000</embargoDate><copyrightCorrect>true</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
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 EEN 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 Engineering COLLEGE CODE EEN 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
format Journal article
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_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
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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 2017-12-31T03:40:38Z
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score 11.012678

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