The effect of fluid viscoelasticity in lubricated contacts in the presence of cavitation

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buir.contributor.authorGamaniel, Samuel Shari
buir.contributor.authorBiancofiore, Luca
buir.contributor.orcidGamaniel, Samuel Shari|0000-0001-5069-0474
buir.contributor.orcidBiancofiore, Luca|0000-0001-7159-7965
dc.citation.epage18en_US
dc.citation.spage1en_US
dc.citation.volumeNumber160en_US
dc.contributor.authorGamaniel, Samuel Shari
dc.contributor.authorDini, D.
dc.contributor.authorBiancofiore, Luca
dc.date.accessioned2022-02-24T08:26:49Z
dc.date.available2022-02-24T08:26:49Z
dc.date.issued2021-03-27
dc.departmentDepartment of Mechanical Engineeringen_US
dc.description.abstractIn this work we study the influence of fluid viscoelasticity on the performance of lubricated contacts in the presence of cavitation. Several studies of viscoelastic lubricants have been carried out, but none of them have considered the possibility of the presence of cavitation. To describe the effect of viscoelasticity, we use the Oldroyd-B model. By assuming that the product between ϵ, i.e. the ratio between vertical and horizontal length scales, and the Weissenberg number (Wi), i.e. the ratio between polymer relaxation time and flow time scale, is small, we can linearise the viscoelastic thin film equations, following the approach pioneered by "Tichy, J., 1996, Non-Newtonian lubrication with the convected Maxwell model." Consequently, the zeroth-order in ϵWi corresponds to a Reynolds equation modified to describe also the film cavitation through the mass-conserving Elrod-Adams model. We consider the flow of viscoelastic lubricants using: (i) a cosine profile representing a journal bearing unwrapped geometry, and (ii) a pocketed profile to model a textured surface in lubricated contacts. The introduction of viscoelasticity decreases the length of cavitated region in the cosine profile due to the increasing pressure distribution within the film. Consequently, the load carrying capacity increases with Wi by up to 50% in the most favorable condition, confirming the beneficial influence of the polymers in bearings. On the other hand for the pocketed profile, results show that the load can increase or decrease at higher Wi depending on the texture position in the contact. The squeeze flow problem between two plates is also modeled for viscoelastic lubricants considering an oscillating top surface. For this configuration a load reduction is observed with increasing Wi due to the additional time needed to reform the film at high Wi. Furthermore, if viscoelastic effects increase, the cavitation region widens until reaching a value of Wi for which a full-film reformation does not occur after the initial film rupture.en_US
dc.embargo.release2023-03-27
dc.identifier.doi10.1016/j.triboint.2021.107011en_US
dc.identifier.eissn1879-2464
dc.identifier.issn0301-679X
dc.identifier.urihttp://hdl.handle.net/11693/77601
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttps://doi.org/10.1016/j.triboint.2021.107011en_US
dc.source.titleTribology Internationalen_US
dc.subjectHydrodynamic lubricationen_US
dc.subjectViscoelasticityen_US
dc.subjectCavitationen_US
dc.subjectJournal bearingsen_US
dc.subjectSqueezingen_US
dc.subjectSurface textureen_US
dc.titleThe effect of fluid viscoelasticity in lubricated contacts in the presence of cavitationen_US
dc.typeArticleen_US

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