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Viscoelastic flow in a 3D square/square contraction: Visualizations and simulations.

2008Journal article Open access
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dc.contributor.authorAlves, M. A.
dc.contributor.authorPinho, Fernando
dc.contributor.authorOliveira, Paulo J.
dc.date.accessioned2010-04-28T10:07:35Z
dc.date.available2010-04-28T10:07:35Z
dc.date.issued2008
dc.description.abstractThe inertialess three-dimensional (3D) flow of viscoelastic shear-thinning fluids in a 4:1 sudden square-square contraction was investigated experimentally and numerically and compared with the flow of inelastic fluids. Whereas for a Newtonian fluid the vortex length remains unchanged at low Reynolds numbers, with the non-Newtonian fluid there is a large increase in vortex length with fluid elasticity leading to unstable periodic flow at higher flow rates. In the steady flow regime the vortices are 3D and fluid particles enter the vortex at the middle plane, rotate towards its eye, drift sideways to the corner-plane vortex, rotate to its periphery, and exit to the downstream duct. Such dynamic process is reverse of that observed and predicted with Newtonian fluids. Numerical predictions using a multimode Phan-Thien–Tanner viscoelastic model are found to match the visualizations accurately and in particular are able to replicate the observed flow reversal. The effect of fluid rheology on flow reversal, vortex enhancement, and entry pressure drop is investigated in detail.pt
dc.identifier.urihttp://hdl.handle.net/10400.6/641
dc.languageeng
dc.subject3D contractionpt
dc.subjectShear-thinningpt
dc.subjectViscoelasticpt
dc.subjectVisualizationspt
dc.subjectVorticespt
dc.titleViscoelastic flow in a 3D square/square contraction: Visualizations and simulations.pt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issueVol. 52, No. 6, pp. 1347-1368.pt
oaire.citation.titleJournal of Rheologypt
person.familyNameAlves
person.familyNamePinho
person.familyNameOliveira
person.givenNameManuel
person.givenNameFernando
person.givenNamePaulo J.
person.identifier.ciencia-id3810-FB97-01DB
person.identifier.ciencia-id7A15-7012-C5DF
person.identifier.orcid0000-0001-6585-6609
person.identifier.orcid0000-0002-9576-4622
person.identifier.orcid0000-0001-9843-7558
person.identifier.ridA-9394-2008
person.identifier.ridD-1035-2011
person.identifier.ridA-4638-2009
person.identifier.scopus-author-id26040459500
person.identifier.scopus-author-id7006647306
person.identifier.scopus-author-id24280605700
rcaap.rightsopenAccess
rcaap.typearticlept
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relation.isAuthorOfPublicationf4a5da68-73fb-4a8b-9418-669d76d75f39
relation.isAuthorOfPublication.latestForDiscovery9e511d49-3b72-4ce7-9325-428c59118015

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