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Accounting for temperature-dependent properties in viscoelastic duct flows

2000Journal article Open access
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dc.contributor.authorNóbrega, J. M.
dc.contributor.authorPinho, Fernando
dc.contributor.authorOliveira, Paulo J.
dc.contributor.authorCarneiro, Olga
dc.date.accessioned2010-04-28T10:07:16Z
dc.date.available2010-04-28T10:07:16Z
dc.date.issued2000
dc.description.abstractA numerical and theoretical study is conducted to evaluate the effect of temperature-dependent properties on the hydrodynamic and thermal characteristics of viscoelastic fluid flow. The rheological constitutive equation of the fluid under consideration follows a common form of the PTT model, which embodies both influences of elasticity and shearthinning in viscosity. A large number of simulations were carried out for a developing channel flow with an imposed constant wall temperature by varying the parameters controlling elasticity (Weissenberg number) and viscous dissipation (Brinkman number). The resulting Nusselt number and friction factor were determined from the numerical results, for both conditions of constant and temperature-dependent properties. The properties that were allowed to vary with temperature were the viscosity, thermal conductivity, specific heat and relaxation time of the PTT model. From the results it was possible to determine how the usual correlations for Nu and Cf have to be modified, following the property-correction method, in order to represent variable-property flow of this viscoelastic fluid. An alternative method to account for variable properties, based on the definition of an equivalent temperature to be used with the constant property Nu and Cf expressions, is also proposed and shown to be less sensitive to the influence of viscous dissipation. The corrections are highly non-linear and strongly depend on eWe2 and Br especially when viscous dissipation is weak.pt
dc.identifier.urihttp://hdl.handle.net/10400.6/601
dc.languageeng
dc.subjectVariable viscositypt
dc.subjectTemperature-dependent propertiespt
dc.subjectViscoelastic flowspt
dc.subjectPTT modelpt
dc.titleAccounting for temperature-dependent properties in viscoelastic duct flowspt
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issueVol. 47, No. 6-7, pp. 1141-1158pt
oaire.citation.titleInternational Journal of Heat and Mass Transferpt
person.familyNameNóbrega
person.familyNamePinho
person.familyNameOliveira
person.familyNameCarneiro
person.givenNameJoão Miguel
person.givenNameFernando
person.givenNamePaulo J.
person.givenNameOlga
person.identifier.ciencia-idDD14-7E8A-7F7E
person.identifier.ciencia-id7A15-7012-C5DF
person.identifier.orcid0000-0002-5303-6467
person.identifier.orcid0000-0002-9576-4622
person.identifier.orcid0000-0001-9843-7558
person.identifier.orcid0000-0001-5384-0028
person.identifier.ridG-1825-2011
person.identifier.ridD-1035-2011
person.identifier.ridA-4638-2009
person.identifier.scopus-author-id7102046214
person.identifier.scopus-author-id7006647306
person.identifier.scopus-author-id24280605700
person.identifier.scopus-author-id7004283519
rcaap.rightsopenAccess
rcaap.typearticlept
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relation.isAuthorOfPublication9933e255-01c8-4867-9506-18a649153d8e
relation.isAuthorOfPublicationf4a5da68-73fb-4a8b-9418-669d76d75f39
relation.isAuthorOfPublication05c09fe4-2a54-467f-943b-c01f31b20b79
relation.isAuthorOfPublication.latestForDiscovery9933e255-01c8-4867-9506-18a649153d8e

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