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Open AccessArticle

Chaotic Manifold Analysis of Four-Screw Extruders Based on Lagrangian Coherent Structures

1
School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China
2
School of Chemistry and Materials Science, Liaoning Shihua University, Fushun 113001, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(11), 2272; https://doi.org/10.3390/ma11112272
Received: 14 October 2018 / Revised: 4 November 2018 / Accepted: 9 November 2018 / Published: 14 November 2018
The four-screw extruder (FSE) is a novel equipment for polymer processing. In this paper, from a new viewpoint of Lagrangian coherent structures (LCS), two-dimensional fluid transport and chaotic mixing characteristics within three kinds of novel industrial FSEs are explored based on LCS to better understand the flow and mixing natures in the FSEs. Firstly, based on the finite-time invariant manifold theory, the finite-time Lyapunov exponent (FTLE) and LCS of FSEs are calculated by considering the different initial time. Hyperbolic LCSs from the FTLE maps are adopted to identify chaotic mixing manifolds in FSEs. Moreover, particle tracking and Poincaré sections are used to illustrate the different fluid motions in the above three isolated regions. Finally, the effects of relative rotating directions and layout of four screws on the chaotic manifolds in FESs are discussed in order to enhance local mixing performance. Furthermore, quantitative mixing measures, such as the segregation scale, logarithmic of stretching, and mean-time mixing efficiency are employed to compare the mixing efficiencies in three kinds of FSEs. The results show that the relative rotating directions and positions of four screws can change the chaotic manifolds and increase mixing performance in local poor mixing regions. FTLE and LCS analysis are helpful to better understand the chaotic mixing nature in the novel screw extruders. View Full-Text
Keywords: extrusion; four-screw extruder; finite-time Lyapunov exponents (FTLE); Poincaré section; chaotic manifold extrusion; four-screw extruder; finite-time Lyapunov exponents (FTLE); Poincaré section; chaotic manifold
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MDPI and ACS Style

Zhu, X.Z.; Tong, Y.; Hu, Y.X. Chaotic Manifold Analysis of Four-Screw Extruders Based on Lagrangian Coherent Structures. Materials 2018, 11, 2272.

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