Show simple item record

dc.contributor.authorOlley, Peter
dc.contributor.authorGough, Timothy D.
dc.contributor.authorSpares, R.
dc.contributor.authorCoates, Philip D.
dc.date.accessioned2022-04-26T09:24:05Z
dc.date.accessioned2022-04-26T11:15:18Z
dc.date.available2022-04-26T09:24:05Z
dc.date.available2022-04-26T11:15:18Z
dc.date.issued2022-06
dc.identifier.citationOlley P, Gough TD, Spares R and Coates PD (2022) 3D simulation of the Hierarchical Multi-Mode Molecular Stress Function constitutive model in an abrupt contraction flow. Journal of Non-Newtonian Fluid Mechanics. 304: 104806.en_US
dc.identifier.urihttp://hdl.handle.net/10454/18929
dc.descriptionYesen_US
dc.description.abstractA recent development of the Molecular Stress Function constitutive model, the Hierarchical Multi-Mode Molecular Stress Function (HMMSF) model has been shown to fit a large range of rheometrical data with accuracy, for a large range of polymer melts. We develop a 3D simulation of the HMMSF model and compare it to experimental data for the flow of Lupolen 1840H LDPE through an abrupt 3D contraction flow. We believe this to be the first finite element implementation of the HMMSF model. It is shown that the model gives a striking agreement with experimental vortex opening angles, with very good agreement to full-field birefringence measurements, over a wide range of flow rates. A method to give fully-developed inlet boundary conditions is implemented (in place of using parabolic inlet boundary conditions), which gives a significantly improved match to birefringence measurements in the inlet area, and in low stress areas downstream from the inlet. Alternative constitutive model parameters are assessed following the principle that extensional rheometer data actually provides a ‘lower bound’ for peak extensional viscosity. It is shown that the model robustly maintains an accurate fit to vortex opening angle and full-field birefringence data, provided that both adjustable parameters are kept such that both shear and extensional data are well fitted.en_US
dc.language.isoenen_US
dc.publisherElsevier
dc.relation.isreferencedbyhttps://doi.org/10.1016/j.jnnfm.2022.104806en_US
dc.rights© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).en_US
dc.subjectMolecular stress function Hierarchical multi-mode molecular stress function HMMSF Simulation Abrupt contraction Vortex Birefringence Stress optical coefficienten_US
dc.subjectMolecular stress functionen_US
dc.subjectHierarchical multi-mode molecular stress function (HMMSF)en_US
dc.subjectSimulationen_US
dc.subjectAbrupt contractionen_US
dc.subjectVortexen_US
dc.subjectBirefringenceen_US
dc.subjectStress optical coefficienten_US
dc.title3D simulation of the Hierarchical Multi-Mode Molecular Stress Function constitutive model in an abrupt contraction flowen_US
dc.status.refereedYesen_US
dc.date.Accepted2022-04-02
dc.date.application2022-04-09
dc.typeArticleen_US
dc.type.versionPublished versionen_US
dc.rights.licenseCC-BYen_US
dc.date.updated2022-04-26T09:24:08Z
refterms.dateFOA2022-04-26T11:16:19Z
dc.openaccess.statusopenAccessen_US


Item file(s)

Thumbnail
Name:
TheHMMSFmodelinsimulation-asac ...
Size:
2.908Mb
Format:
Microsoft Word 2007
Thumbnail
Name:
1-s2.0-S0377025722000544-main.pdf
Size:
11.44Mb
Format:
PDF
Description:
Main article

This item appears in the following Collection(s)

Show simple item record