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Unsteady flow of two viscous fluids in a tubular cavity-application to co-injection molding of thermoplastic polymers

Identifieur interne : 000464 ( France/Analysis ); précédent : 000463; suivant : 000465

Unsteady flow of two viscous fluids in a tubular cavity-application to co-injection molding of thermoplastic polymers

Auteurs : G. Schlatter [France] ; M. Vincent [France] ; J.-F. Agassant [France]

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Mots-clés :

Abstract

Two simulation models for the filling of a tubular cavity by two viscous polymers are proposed. The polymers are assumed to follow a power-law shear-thinning behaviour. The first model is two-dimensional, and is based on a mixed finite element velocity-pressure formulation. This model shows non-zero pressure gradients over the cross-section and a radial component of the velocity. However these are only second order phenomena when the viscosity ratio between the two fluids remains close to 1. We therefore develope a second model one-dimensional based on the lubrication approximation. The displacement of the interface is obtained by the solution of a transport equation. Comparisons show that the 1D model is able to predict the evolution of the interface location between the two polymers, the axial velocity and the pressure profiles accurately. The influence of the consistency ratio on these results is shown.


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Pascal:97-0446345

Le document en format XML

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<term>Cavity flow</term>
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<term>Injection molding</term>
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<term>Numerical simulation</term>
<term>One dimensional model</term>
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<term>Thermoplastique</term>
<term>Moulage injection</term>
<term>Remplissage moule</term>
<term>Ecoulement cavité</term>
<term>Ecoulement instationnaire</term>
<term>Simulation numérique</term>
<term>Modèle 1 dimension</term>
<term>Modèle 2 dimensions</term>
<term>Modèle 2 fluides</term>
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<div type="abstract" xml:lang="en">Two simulation models for the filling of a tubular cavity by two viscous polymers are proposed. The polymers are assumed to follow a power-law shear-thinning behaviour. The first model is two-dimensional, and is based on a mixed finite element velocity-pressure formulation. This model shows non-zero pressure gradients over the cross-section and a radial component of the velocity. However these are only second order phenomena when the viscosity ratio between the two fluids remains close to 1. We therefore develope a second model one-dimensional based on the lubrication approximation. The displacement of the interface is obtained by the solution of a transport equation. Comparisons show that the 1D model is able to predict the evolution of the interface location between the two polymers, the axial velocity and the pressure profiles accurately. The influence of the consistency ratio on these results is shown.</div>
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