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dc.contributor.authorOlley, Peter
dc.contributor.authorGough, Timothy D.
dc.contributor.authorSpares, R.
dc.contributor.authorCoates, Philip D.
dc.date.accessioned2020-09-16T11:56:08Z
dc.date.accessioned2020-09-28T13:21:40Z
dc.date.available2020-09-16T11:56:08Z
dc.date.available2020-09-28T13:21:40Z
dc.date.issued2021
dc.identifier.citationOlley P, Gough TD, Spares R et al (2021) An experimental and simulation comparison of a 3-D abrupt contraction flow using the Molecular Stress Function constitutive model. Plastics, Rubber and Composites. 50(1): 18-34.en_US
dc.identifier.urihttp://hdl.handle.net/10454/18042
dc.descriptionYesen_US
dc.description.abstractThe Molecular Stress Function (MSF) constitutive model with convective constraint release mechanism has been shown to accurately fit a large range of viscometric data, and also shown to give strong vortex growth in flows of LDPE through planar and axisymmetric contractions. This work compares simulation and experimental results for 3-D flows of Lupolen 1840H LDPE through a contraction slit; 3-D effects are introduced by using a slit with a low upstream aspect ratio of 5:3. Comparisons are made with vortex opening angles obtained from streak photography, and also with stress birefringence measurements. The comparisons are made with two versions of the convective constraint release (CCR) mechanism. The simulated vortex angles for one version of the CCR mechanism are found to approach what is seen experimentally. The best-fit value for the stress optical coefficient was found to vary between CCRs and to decrease with flow rate. This is partially explained by different centreline elongational rates with the two CCRs, which in turn is related to different opening angles. A 3-D simulation is compared to the corresponding 2-D simulation. It is shown that both velocity vectors and birefringence show only small changes to around 60% of the distance to the side wall.en_US
dc.language.isoenen_US
dc.publisherManey Publishing
dc.relation.isreferencedbyhttps://doi.org/10.1080/14658011.2020.1826195
dc.rights© 2021 Taylor & Francis. The Version of Record of this manuscript has been published and is available in Plastics, Rubber and Composites, date of publication (https://doi.org/10.1080/14658011.2020.1826195)en_US
dc.subjectSimulationen_US
dc.subjectOpening angleen_US
dc.subjectMolecular stress functionen_US
dc.subjectConvective constraint releaseen_US
dc.subjectStress optical coefficienten_US
dc.subjectVortext growthen_US
dc.subjectStreak photographyen_US
dc.subjectBirefringenceen_US
dc.titleAn experimental and simulation comparison of a 3-D abrupt contraction flow using the Molecular Stress Function constitutive modelen_US
dc.status.refereedYesen_US
dc.date.Accepted2020-09-15
dc.date.application2020-09-29
dc.typeArticleen_US
dc.date.EndofEmbargo2021-09-30
dc.type.versionAccepted manuscripten_US
dc.description.publicnotesThe full-text of this article will be released for public view at the end of the publisher embargo on 30 Sep 2021.
dc.date.updated2020-09-16T10:56:10Z
refterms.dateFOA2020-09-28T13:34:21Z


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