Simulation analysis of the influence of screw configuration on the flow field of meshing twin screw

Abstract

Abstract: The flow channel distribution of three different screw configurations was discussed by taking polylactic acid （PLA） in a twin-screw extruder with different directions at ratios of screw heads to rotor of 2∶2， 3∶2， 4∶2. The 3D models for these three screw configurations were established by the SolidWorks software according to a theoretical end curve equation. The mesh models of the three screw configurations were established using the Workbench software， and the actual flow field was simulated using the Polyflow fluid simulation software to obtain the post-processing results. The final result was analyzed by using the FieldView post-processing analysis software. The pressure， shear rate， and viscosity of the PLA fluid were studied under different screw configurations. Meanwhile， the residence time distribution curve and distribution mixing characteristics were compared by using the Polystat statistical module. The results indicated that the pressure fluctuation decreased， the shear effect increased， the residence time increased， and the distribution effect increased with an increase in the number of screw heads of the negative rotor at a screw speed of 60 rpm with the certain number of screw heads of the positive rotor. There are advantageous to the output and mixing of materials.

Key words: screw extruder, opposite meshing, number of screw head, numerical simulation, flow field analysis

References

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