Numerical simulation of chaotic mixing in single screw extruders with different baffle heights

B. P. Xu, L. He, M. G. Wang, S. Z. Tan, H. W. Yu, Lih Sheng Turng*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

6 Scopus citations

Abstract

A kind of discontinuous baffle, which had the same length as the non-baffle zone distance, was inserted in the unwound channel of a single screw extruder to enhance mixing in the screw channel. The periodic unit of the flow channel was modeled as a dynamic system of complex duct flow. The finite volume method was used to solve the three-dimensional flow of purely viscous non-Newtonian fluid. Fluid particle tracking was performed by a fourth-order Runge–Kutta scheme. The effect of the baffle height on the mixing kinematics was investigated numerically. Poincaré sections were applied to reveal the different patterns and sizes of the KAM tubes. Distributive mixing was then visualized by the evolution of passive tracers initially located at different positions. The variance index and residence time distribution (RTD) were used to evaluate the statistical results. Among the four test cases, the results showed that the case with the baffle height equal to the screw depth had the largest chaotic mixing region, but the shortest mean residence time and the narrowest broadening of RTD under the same pressure gradient.

Original languageEnglish
Pages (from-to)108-118
Number of pages11
JournalInternational Polymer Processing
Volume31
Issue number1
DOIs
StatePublished - 03 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© Carl Hanser Verlag, GmbH & Co. KG.

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