Example: Polymer Extrusion

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Presentation transcript:

Example: Polymer Extrusion

Non-Newtonian flow, Carreau viscosity Polymer extrusion Non-Newtonian flow, Carreau viscosity Study the influence of shear rate dependent viscosity. Linear polystyrene solution. Carreau viscosity model .

Equations Momentum and continuity equations. Polymer extrusion - Equations Equations Momentum and continuity equations. The viscosity is dependent on the shear rate The Carreau-viscosity is given by

Polymer extrusion - Geometry Due to rotational symmetry, we can reduce the model dimensions from 3D to axisymmetric 2D.

Polymer extrusion - Results Velocity field The average velocity is substantially lower at the outlet compared to the inlet, due to the rotational symmetry.

Non-Newtonian viscossity Polymer extrusion - Results Non-Newtonian viscossity Large variations in the contraction between the piston and the walls of the device. The narrow channel generates large shear rates close to the walls.