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      Numerical Simulation of Chaotic Mixing in Single Screw Extruders with Different Baffle Heights

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          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.

          Most cited references19

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          Stirring by chaotic advection

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            The development of chaotic advection

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              The definition and measurement of some characteristics of mixtures

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                2 March 2016
                : 31
                : 1
                : 108-118
                Affiliations
                1 Technology Development Center for Polymer Processing Engineering of Guangdong Colleges and Universities, Guangdong Industry Technical College, Guangzhou, PRC
                2 Polymer Engineering Center, University of Wisconsin–Madison, Madison, WI, USA
                Author notes
                [* ] Correspondence address, Mail address: Lih-Sheng Turng, Polymer Engineering Center, University of Wisconsin–Madison, Madison, WI 53706, USA. E-mail: turng@ 123456engr.wisc.edu
                Article
                IPP3167
                10.3139/217.3167
                ed78147b-fcfe-41b3-ad7d-c5d3fe482ecb
                © 2016, Carl Hanser Verlag, Munich
                History
                : 26 August 2015
                : 20 October 2015
                Page count
                References: 20, Pages: 11
                Categories
                Regular Contributed Articles

                Polymer science,Materials technology,Materials characterization,General engineering,Polymer chemistry

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