Modélisation et simulation numérique de la thermomécanique des écoulements dans les co-malaxeurs

Abstract : The aim of this study was to model molten polymers flow in BUSS type co-kneaders. The BUSS co-kneader is a particular single-screw extruder. It is composed of a rotating screw like standard single screw extruders, but with interrupted flights and mixing pins fixed to the barrel. The screw has also an axial reciprocal movement. It has been used for decades in industry for its mixing capacities, specifically for PVC gelification or polymer compounding with fibres, additives or carbon black. This work is therefore answering to nowadays industrial needs, as developing new products is expensive and time consuming.A 2D time-dependent thermomechanical model based on Hele Shaw approximations was developed and the co-kneader domain was discretized by finite elements. The numerical problem was solved by finite elements and SUPG stabilized finite elements. This model provides, at every point of the calculation domain, the pressure, throughput vectors, shear rates, viscosity as well as temperature.Simulation results provide pressure and temperature orders of magnitude, as well as information on polymer mixing depending on process parameters. A comparison between the model and experimental trials shows a satisfactory agreement in the filled zones.
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Lucas Sardo. Modélisation et simulation numérique de la thermomécanique des écoulements dans les co-malaxeurs. Matériaux et structures en mécanique [physics.class-ph]. PSL Research University, 2016. Français. ⟨NNT : 2016PSLEM044⟩. ⟨tel-01649228⟩

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