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      Numerical Modelling of the Non-Isothermal Flow of a Non-Newtonian Polymer in a Co-Kneader

      1 , 1 , , 1 , *

      International Polymer Processing

      Carl Hanser Verlag

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          Abstract

          The co-kneader is a particular single-screw extruder with pins fixed on the barrel, interrupted screw flights, and a screw with both rotational and reciprocating motions. The co-kneader is principally used for its excellent mixing capacities. In order to calculate the flow in the co-kneader, we developed a simplified Hele-Shaw model which takes into account the mixing pins and the reciprocating motion of the screw. In this paper we describe the model and the effects of the reciprocating motion and the presence of mixing pins on the polymer flow.

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          Most cited references 18

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          Finite element methods for linear hyperbolic problems

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            Negative Pressures in Modelling Rotating Polymer Processing Machinery Are Meaningless, But They Are Telling Something

             A. Goger,  J. Vlachopoulos (corresponding) ,  M Thompson (2014)
            In the technical literature, some authors have reported calculation of negative pressures in simulations of twin screw extrusion and other types of processing, without giving any explanations. In the majority publications there is no mention of such meaningless results, even though theoretical considerations indicate that negative pressures could be obtained in the expansion region of drag flows through narrow non-parallel surfaces. The meaningless negative pressures are due to the application of single fluid theory to flow regions where bubbles would form, when the pressure drops below the vapor pressure of the liquid. This has been known for a long time from the study of lubrication bearings and related cavitation phenomena. It is argued that the boundary conditions should be carefully chosen for avoiding results in numerical simulations, which can never be reconciled with experimental pressure data.
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              On the modeling of continuous mixers Part II The cokneader

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                Author and article information

                Journal
                ipp
                International Polymer Processing
                Carl Hanser Verlag
                0930-777X
                2195-8602
                11 August 2017
                : 32
                : 4
                : 425-433
                Affiliations
                1 MINES ParisTech, PSL Research University, CEMEF – Centre de Mise en Forme des Matériaux, Sophia-Antipolis, France
                Author notes
                [* ] Correspondence address, Mail address: Rudy Valette, MINES ParisTech, PSL Research University, CEMEF – Centre de Mise en Forme des Matériaux, UMR CNRS 7635, CS 10207, 06904 Sophia-Antipolis, France, E-mail: rudy.valette@ 123456mines-paristech.fr
                Article
                IPP3350
                10.3139/217.3350
                © 2017, Carl Hanser Verlag, Munich
                Page count
                References: 19, Pages: 9
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/ipp
                Categories
                Regular Contributed Articles

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