An investigation into the constriction flow of a particle reinforced polystyrene melt using a combination of flow visualtization and finite element simulations

J. Embery, M. Tassieri, P.J. Hine, T.D. Lord

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Abstract

This paper investigates the flow of a particle filled polystyrene melt through a constriction zone using a combination of experimental techniques and computer simulation. A special blend, containing cross-linked polystyrene beads mixed into a polydispersed polystyrene matrix, was produced for this study. This closely refractive index matched blend allowed visualization of the flow birefringence up to an equivalent particle loading of around 15 vol¿%. Flow birefringence through a 10:1.4 contraction, measured using a multi-pass rheometer (MPR), was compared with that predicted from finite element simulations, in a similar way to that already published for unfilled polymer melts [ Collis et al., J. Rheol. 49(2), 501–522 (2005) ]. Numerical predictions were obtained using the finite element solver "EUFLOW" and ranked against the experimental processing data from the MPR. An extensive study of the rheology of the particle filled polystyrene blend was conducted which provided the input to the simulations. The addition of the particles was seen to enhance the shear thinning of the melt, while debonding between the particles and the polystyrene melt during extension testing had the effect of reducing strain hardening. EUFLOW was used to evaluate how these two important aspects could affect the flow birefringence of the filled polystyrene melt.
Original languageEnglish
Pages (from-to)1097-1117
JournalJournal of Rheology
Volume54
Issue number5
DOIs
Publication statusPublished - 2010

Fingerprint

Polystyrenes
constrictions
polystyrene
Birefringence
birefringence
rheometers
simulation
Rheometers
shear thinning
Shear thinning
Polymer melts
strain hardening
Debonding
Rheology
rheology
Strain hardening
beads
contraction
Refractive index
Visualization

Cite this

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title = "An investigation into the constriction flow of a particle reinforced polystyrene melt using a combination of flow visualtization and finite element simulations",
abstract = "This paper investigates the flow of a particle filled polystyrene melt through a constriction zone using a combination of experimental techniques and computer simulation. A special blend, containing cross-linked polystyrene beads mixed into a polydispersed polystyrene matrix, was produced for this study. This closely refractive index matched blend allowed visualization of the flow birefringence up to an equivalent particle loading of around 15 vol¿{\%}. Flow birefringence through a 10:1.4 contraction, measured using a multi-pass rheometer (MPR), was compared with that predicted from finite element simulations, in a similar way to that already published for unfilled polymer melts [ Collis et al., J. Rheol. 49(2), 501–522 (2005) ]. Numerical predictions were obtained using the finite element solver {"}EUFLOW{"} and ranked against the experimental processing data from the MPR. An extensive study of the rheology of the particle filled polystyrene blend was conducted which provided the input to the simulations. The addition of the particles was seen to enhance the shear thinning of the melt, while debonding between the particles and the polystyrene melt during extension testing had the effect of reducing strain hardening. EUFLOW was used to evaluate how these two important aspects could affect the flow birefringence of the filled polystyrene melt.",
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An investigation into the constriction flow of a particle reinforced polystyrene melt using a combination of flow visualtization and finite element simulations. / Embery, J.; Tassieri, M.; Hine, P.J.; Lord, T.D.

In: Journal of Rheology, Vol. 54, No. 5, 2010, p. 1097-1117.

Research output: Contribution to journalArticleAcademicpeer-review

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