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 10 2 to 10 4 Pa · s.
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General equations of viscous fluid mechanics
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