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The effect of expansion ratio for creeping expansion flows of UCM fluids

2009Journal article Open access
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dc.contributor.authorPoole, R. J.
dc.contributor.authorPinho, Fernando
dc.contributor.authorAlves, M. A.
dc.contributor.authorOliveira, Paulo J.
dc.date.accessioned2010-04-28T10:07:34Z
dc.date.available2010-04-28T10:07:34Z
dc.date.issued2009
dc.description.abstractA systematic numerical investigation on creeping flows in planar sudden expansions of viscoelastic fluids obeying the upper-convected Maxwell model is carried out to assess the combined effects of viscoelasticity, through the Deborah number, and expansion ratio (ER), which was varied between 1.25 and 32. At large expansion ratios (ER≥4) the flow becomes dominated by the downstream duct size and appropriately normalized quantities tend to be independent of ER. The recirculation size and strength become decreasing functions of De, whereas the Couette correction (the normalized entry pressure drop due to the presence of the expansion) increases. At small ER (ER≤3), however, no simple scaling laws are found and there is a complex interaction between De and ER leading to non-monotonic variations, with an initial decrease in the recirculation length at low Deborah numbers, followed by an enhancement as De increases.pt
dc.identifier.urihttp://hdl.handle.net/10400.6/633
dc.languageeng
dc.subjectPlanar sudden expansionpt
dc.subjectUCMpt
dc.subjectCreeping flowpt
dc.subjectExpansion ratio effectspt
dc.titleThe effect of expansion ratio for creeping expansion flows of UCM fluidspt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issueVol. 163, pp. 35–44pt
oaire.citation.titleJournal Non-Newtonian Fluid Mechanicspt
person.familyNamePoole
person.familyNamePinho
person.familyNameAlves
person.familyNameOliveira
person.givenNameRobert
person.givenNameFernando
person.givenNameManuel
person.givenNamePaulo J.
person.identifier.ciencia-id3810-FB97-01DB
person.identifier.ciencia-id7A15-7012-C5DF
person.identifier.orcid0000-0001-6686-4301
person.identifier.orcid0000-0002-9576-4622
person.identifier.orcid0000-0001-6585-6609
person.identifier.orcid0000-0001-9843-7558
person.identifier.ridB-7960-2008
person.identifier.ridD-1035-2011
person.identifier.ridA-9394-2008
person.identifier.ridA-4638-2009
person.identifier.scopus-author-id7102334697
person.identifier.scopus-author-id7006647306
person.identifier.scopus-author-id26040459500
person.identifier.scopus-author-id24280605700
rcaap.rightsopenAccess
rcaap.typearticlept
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relation.isAuthorOfPublication9933e255-01c8-4867-9506-18a649153d8e
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relation.isAuthorOfPublication.latestForDiscovery9e511d49-3b72-4ce7-9325-428c59118015

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