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
The average viscosity of a flowing polymer melt is in the range 102 to 104 Pa · s.
Knowing that 1 Pa · s (pascal-second) ≥ 1 PI (poiseuille) ≥ 10 P (poises). This has far-reaching consequences.
Firstly,...
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General equations of viscous fluid mechanics
Simplification methods
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