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Laminar flow of a viscoelastic shear-thinning liquid through a plane sudden expansion preceded by a gradual contraction

2005Journal article Open access
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dc.contributor.authorPoole, R. J.
dc.contributor.authorEscudier, M. P.pt
dc.contributor.authorOliveira, Paulo J.
dc.date.accessioned2010-04-28T10:07:14Z
dc.date.available2010-04-28T10:07:14Z
dc.date.issued2005
dc.description.abstractExperimental observations are reported for the laminar flow of a viscoelastic liquid through a symmetrical plane sudden expansion preceded by a gradual contraction from a square duct. As is well known, for Newtonian fluid flow above a critical Reynolds number the flowfield downstream of an expansion becomes asymmetric. For the viscoelastic liquid investigated here the asymmetry is greatly reduced, with very similar reattachment lengths for the two recirculation regions. More significantly, the flow unexpectedly develops a strongly three-dimensional jet-like structure, with side-to-side symmetry centred on the ‘vertical’ symmetry plane of the contraction/expansion geometry. Especially interesting is the flow within the contraction itself, where the nature of the flow field for the viscoelastic liquid is also fundamentally different to that for a comparable Newtonian fluid flow: large velocity overshoots with very strong gradients occur near to the sidewalls that, due to their appearance, we have termed ‘cat’s ears’. The fully developed approach flow in the square duct is unremarkable.pt
dc.identifier.urihttp://hdl.handle.net/10400.6/595
dc.languageeng
dc.subjectViscoelasticpt
dc.subjectNon-Newtonianpt
dc.subjectSudden expansionpt
dc.subjectGradual contractionpt
dc.titleLaminar flow of a viscoelastic shear-thinning liquid through a plane sudden expansion preceded by a gradual contractionpt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issueVol. 461, No. 2064, pp. 3827-3845.pt
oaire.citation.titleProc. Royal Society of London, Series A: Mathematical, Physical and Engineering Sciencespt
person.familyNamePoole
person.familyNameOliveira
person.givenNameRobert
person.givenNamePaulo J.
person.identifier.ciencia-id7A15-7012-C5DF
person.identifier.orcid0000-0001-6686-4301
person.identifier.orcid0000-0001-9843-7558
person.identifier.ridB-7960-2008
person.identifier.ridA-4638-2009
person.identifier.scopus-author-id7102334697
person.identifier.scopus-author-id24280605700
rcaap.rightsopenAccess
rcaap.typearticlept
relation.isAuthorOfPublication8354a555-8319-44e6-95e0-4ca1fc7db4dd
relation.isAuthorOfPublicationf4a5da68-73fb-4a8b-9418-669d76d75f39
relation.isAuthorOfPublication.latestForDiscovery8354a555-8319-44e6-95e0-4ca1fc7db4dd

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