Numerical simulation of the transient flow of branched polymer melts through a planar contraction using the 'pom-pom' model

G. B. Bishko, O. G. Harlen*, T. C.B. McLeish, T. M. Nicholson

*Corresponding author for this work

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Calculations of the transient flow of branched polymer melts through a planar 4 : 1 contraction and along a channel are presented. The polymer is modelled as a monodisperse suspension of 'pom-pom' molecules using the constitutive equation developed by McLeish and Larson [T.C.B. McLeish, R.G. Larson, J. Rheol. 42 (1998) 81-110], which provides a direct link between the molecular topology and the flow properties of the melt. The branching produces an enhancement in the size of the upstream vortex, similar to that observed experimentally with branched polymer melts. The effect arises from the widely differing responses in shear and extensional flow, and is predicted to be sensitive to time, degree of branching and Weissenberg number.

Original languageEnglish
Pages (from-to)255-273
Number of pages19
JournalJournal of Non-Newtonian Fluid Mechanics
Issue number2-3
Publication statusPublished - 1 May 1999
EventProceedings of the 1998 IUTAM Symposium on Viscoelastic Fluid Mechanics:Effects of Molecular Modelling - Stanford, CA, USA
Duration: 21 Jun 199825 Jun 1998

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