pps proceeding - Abstract Preview
pps proceeding
Symposium: Modeling & Simulation
Oral Presentation
 
 

Threedimensional Characterization of Dispersive Mixing in Single Screw Extruders

Erb Thomas (1)*, Celik Oguz (1), Bonten Christian (1)

(1) Institut für Kunststofftechnik, Universität Stuttgart - Stuttgart - Germany

Shear- and mixing elements in single-screw extruders have to meet high requirements in order to achieve good melt homogeneity even at high rotation speeds. A model for the description of the fluid element deformation has been implemented in the CFD-Code OpenFOAM® for the characterization of dispersive mixing. The calculation approach has been implemented in an Eulerian frame (stationary observer) as well as in a Lagrangian approach (calculation along streamlines) to examine the influence of numerical dissipation on the calculation results. Using two analytically calculable test cases, the correct implementation of the calculation approach in OpenFOAM® has been verified. In case of the Couette flow a greater variance due to numerical dissipation has been observed for the Eulerian frame calculations, while the Langrangian calculations still provided correct results. Finally the calculation model has been successfully applied to a three-dimensional Saxton mixer geometry.