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Article | REF: AM3655 V1

Modeling flow in extrusion dies

Authors: Bruno VERGNES, Jean-François AGASSANT

Publication date: July 10, 2008, Review date: January 10, 2019

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2. General equations of viscous fluid mechanics

The equations of continuum mechanics form the basis for modeling flows in extrusion dies. However, a number of specificities linked to the physical properties of polymers in the molten state will make this approach particular.

2.1 Specificity of polymer melt flows

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2.1.1 High viscosity

The average viscosity of a flowing polymer melt is in the range 10 2 to 10 4 Pa · s.

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General equations of viscous fluid mechanics
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