@inproceedings{f4855e1681ab49dca4771f0d73196bed,
title = "Experimental and computational identification of a polymer melt flow instability",
abstract = "Entangled polymer melts exhibit a variety of flow instabilities that limit production rates in industrial applications. We study one such flow instability, in a contraction-expansion geometry, through both experiment and numerical calculation. The experiments investigate the flow of monodisperse linear polystyrenes in a multi-pass rheometer, and we present observations of a bulk instability, which is first observed at the slit outlet and subsequently produces large-scale fluid motions upstream. The numerical study uses linear stability theory with a semi-staggered finite-volume scheme, and models the fluid using the Rolie-Poly constitutive equation. The numerical results confirm the instability and we are able to identify important parameters for instability within the model. This gives a physical insight into the underlying mechanisms involved.",
keywords = "Constriction, Contraction-expansion, Linear stability, Monodisperse, MPR, Parallel computation, Viscoelastic instability",
author = "Hassell, {David G.} and Mackley, {Malcolm R.} and Mehmet Sahin and Wilson, {Helen J.}",
year = "2008",
doi = "10.1063/1.2964614",
language = "English",
isbn = "9780735405493",
series = "AIP Conference Proceedings",
pages = "147--149",
booktitle = "The XVth International Congress on Rheology - The Society of Rheology 80th Annual Meeting",
note = "15th International Congress on Rheology ; Conference date: 03-08-2008 Through 08-08-2008",
}