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Analysis of mixing in modified single screw extruders

✍ Scribed by Lewis Erwin; Farzad Mokhtarian

Publisher
Society for Plastic Engineers
Year
1983
Tongue
English
Weight
908 KB
Volume
23
Category
Article
ISSN
0032-3888

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✦ Synopsis

Abstract

A numerical model of mixing in single‐screw extrusion is developed which uses a two‐dimensional unsteady analogue to three‐dimensional continuous mixing. This two‐dimensional unsteady analogue uses the transverse and axial velocities to calculate an apparent tránsverse streamline velocity which is used to simulate mixing. The mixing calculations are rigorously correct for continuous mixing of well‐metered streams of equal‐viscosity Newtonian fluids in continuous mixers of constant envelope. This scheme is applied to the analysis of singlescrew extruders with stepwise varying cross‐section, particularly beginning and ending flights. The numerical simulation produces patterns qualitatively similar to those observed in mixing experiments and predicts behavior for unmodified extruders in close quantitative agreement with experiments.

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## Abstract In the single‐screw extruder, the vibration force field is applied to the solids conveying process by the axial vibration of the screw and the novel concept on the solids conveying process being strengthened with the vibration force field has been brought forward in this study. We estab