No Cover Image

Journal article 356 views

Numerical computation of extrusion and draw-extrusion cable-coating flows with polymer melts

A. Al-Muslimawi, H.R. Tamaddon-Jahromi, Michael Webster Orcid Logo

Applied Rheology, Volume: 24, Start page: 34188

Swansea University Author: Michael Webster Orcid Logo

Full text not available from this repository: check for access using links below.

DOI (Published version): 10.3933/ApplRheol-24-34188

Abstract

This paper is concerned with the numerical solution of polymer melt flows of both extrudate-swell and tube-tooling die-extrusion coatings, using a hybrid finite element/finite volume discretisation (fe/fv). Extrudate-swell presents a single dynamic free-surface, whilst the complex polymer melt coating...

Full description

Published in: Applied Rheology
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa24193
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: This paper is concerned with the numerical solution of polymer melt flows of both extrudate-swell and tube-tooling die-extrusion coatings, using a hybrid finite element/finite volume discretisation (fe/fv). Extrudate-swell presents a single dynamic free-surface, whilst the complex polymer melt coating flow exhibit two separate free-surface draw-down sections to model, an inner and outer conduit surface of the melt. The interest lies in determining efficient windows for process control over variation in material properties, stressing levels generated and pressure drop. In this respect, major rheological influences are evaluated on the numerical predictions generated of the extensional viscosity and Trouton ratio, when comparing solution response for an exponential Phan-Thien Tanner (EPTT, network-based) model to that for a single extended pom-pom (SXPP, kinematic-based) model. The impact of shear-thinning is also considered. Attention is paid to the influence and variation in Weissenberg number (We), solvent-fraction (β, polymeric concentration) and second normal stress difference (N2) (ξ parameter for both EPTT and SXPP, and anisotropy parameter for SXPP). The influence of model choice and parameters upon field response is described in situ through, pressure, shear and strain-rates and stress. The numerical scheme solves the momentum-continuity-surface equations by a semi-implicit time-stepping incremental Taylor-Galerkin/pressure-correction finite element method, whilst invoking a cell-vertex fluctuation distribution/median-dual-cell finite volume approximation for the first-order space-time hyperbolic-type stress evolution equation.
Keywords: Taylor-Galerkin, tube-tooling, cable-coating, die-extrusion, free-surface, exponential Phan-Thien Tanner model, Single extended pom-pom model
College: Faculty of Science and Engineering
Start Page: 34188