Numerical simulation of fluid flow and mixing dynamics inside planetary roller extruders / J. Winck in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 5 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 5 (2021) . - p. 508-518 Titre : Numerical simulation of fluid flow and mixing dynamics inside planetary roller extruders Type de document : texte imprimé Auteurs : J. Winck, Auteur ; S. Frerich, Auteur Année de publication : 2021 Article en page(s) : p. 508-518 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Extrudeuse à rouleau planétaire Fluides, Mécanique des Mélange Rhéologie Simulation par ordinateur Technique de superposition de maillage Index. décimale : 668.4 Plastiques, vinyles Résumé : In this contribution, the fluid flow and mixing dynamics inside planetary roller extruders are simulated using the finite element method (FEM) and the mesh superposition technique (MST). Three-dimensional configurations with planetary spindles of varying number and geometry of planetary spindles were created to analyse the influence of the spindle configuration and the rotational speed on the process behavior. Therefore, pressure gradients, flow velocities and directions, shear rates, the mixing index and residence time distributions were evaluated. The distributive and dispersive mixing efficiencies varied depending on the planetary spindle configuration, and these configurations thus suit different processing tasks. In comparison to the standard planetary spindles, the TT3 spindles, with their incomplete toothing, and the knob spindles, with their double transversal helical toothing, showed intense axial and radial mixing. In general, the mixing performance of the planetary roller extruder is explained by a high rate of extensional flow and frequent changes in flow type. The reported numerical approach allows, for the first time, a comprehensive observation of the process behavior of planetary roller extruders. Note de contenu : - Simulation methods - Material data - Geometry and spindle rotations - Meshing - Evaluation of mixing dynamics - Table 1 : Cross model parameters of a PLA melt at 180°C (Othman et al., 2014) - Table 2 : Positioning of planetary spindles inside the barrel cylinder for configurations of three, four, five and six planetary spindles - Table 3 : Rotational speed ratios implemented in the simulation - Table 4 : Mesh characteristics of the extruder components - Table 5 : Meshes for the mesh independency study - Table 6 : Investigated discretizations of extruder motions based on the number of time steps for a rotational speed of 20 min– - Table 7 : Selected discretization of extruder motions - Table 8 : Influence of different planetary roller extruder configurations on processing parameters DOI : https://doi.org/10.1515/ipp-2020-4084 En ligne : https://drive.google.com/file/d/1l2rfPrd9cVZ_bgdtKhjhBxhLBGs5zuV2/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36518 [article]

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