Comparison between 1D and 3D approaches for twin-screw extrusion simulation / A. Durin in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 641-648 Titre : Comparison between 1D and 3D approaches for twin-screw extrusion simulation Type de document : texte imprimé Auteurs : A. Durin, Auteur ; Philippe de Micheli, Auteur ; H.-C. Nguyen, Auteur ; C. David, Auteur ; Rudy Valette, Auteur ; Bruno Vergnes, Auteur Année de publication : 2014 Article en page(s) : p. 641-648 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Extrudeuse bi-vis Imagerie tridimensionnelle Rhéologie Simulation par ordinateur Index. décimale : 668.9 Polymères Résumé : In this paper, numerical simulations of flows in a co-rotating intermeshing twin-screw extruder are performed using a previously presented 3D finite elements model. Some numerical improvements recently introduced are presented. The computations are performed for several processing conditions and screw arrangements. Values of specific energy, pressure and filled length are compared to the results issuing from the 1D Ludovic software in order to compare both approaches. The 3D simulation method is found to be more accurate to describe the effect of varying staggering angle and thickness of kneading discs. On the other hand, 1D model provides very satisfactory results for flows in screw elements. Note de contenu : - COMPUTATIONAL METHOD : 1. Fluid Domain, Velocity/Pressure Problem and Boundary Conditions - 2. Immersion Technique and Finite Element Solver - 3. A Posteriori Mesh Adaptation - COMPUTATIONAL RESULTS : 1. Flow Rate and Xcrew Speed Influence - 2. Staggering Angle Influence - 3. Discs Thickness Influence - COMPARISON BETWEEN 1D AND 3D RESULTS DOI : 10.3139/217.2951 En ligne : https://drive.google.com/file/d/1-RUc9o6Y_V4GvvcfZ2AHO2I4tjT-IYFX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22244 [article]

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A direct 3D numerical simulation code for extrusion and mixing processes / Rudy Valette in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 2 (05/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 2 (05/2009) . - p. 141-147 Titre : A direct 3D numerical simulation code for extrusion and mixing processes Type de document : texte imprimé Auteurs : Rudy Valette, Auteur ; T. Coupez, Auteur ; C. David, Auteur ; Bruno Vergnes, Auteur Année de publication : 2009 Article en page(s) : p. 141-147 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This work focuses on the development of a general finite element code devoted to the three-dimensional direct simulation of mixing processes of complex fluids. The code, developed from the CimLib© Library, is based on a domain immersion method coupled with a "level-set" approach to represent the rigid moving boundaries, such as screws and rotors, as well as free surfaces. These techniques, combined with the use of automatized parallel computing, allow calculating the time-dependent flow of generalized Newtonian fluids in large and complex processes, involving moving free surfaces which are treated by a level-set/Hamilton-Jacobi method. Three examples of flow case studies are presented in this paper: the flow within the mixing section of a twin-screw extruder, the flow in an internal mixer and the flow in a batch mixer. DOI : 10.3139/217.2207 En ligne : https://drive.google.com/file/d/1G8_6SiiUnThTDmHctNiZjdzUU_jmLwq5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5245 [article]

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Optimization and scale-up of twin-screw reactive extrusion : the case of EVA transesterification / Françoise Berzin in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 422-428 Titre : Optimization and scale-up of twin-screw reactive extrusion : the case of EVA transesterification Type de document : texte imprimé Auteurs : Françoise Berzin, Auteur ; C. David, Auteur ; Bruno Vergnes, Auteur Année de publication : 2020 Article en page(s) : p. 422-428 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère éthylène acétate de vinyle Esterification Extrudeuse bi-vis Extrusion réactive Modèles numériques Index. décimale : 668.4 Plastiques, vinyles Résumé : Despite its complexity, reactive extrusion is continuously developing for the production of new and performing materials. Due to the strong coupling between flow, rheology and chemistry, optimizing this process for a given reaction remains a difficult task. Moreover, the scale-up from the laboratory to the production scale is another crucial question, which cannot be solved by conventional techniques. In this paper, we show how the use of numerical modeling may help answer these complex questions by providing realistic solutions, rapidly and without excessive costs. The example of a transesterification reaction was chosen because this reaction has been carefully characterized in previous studies. The reaction kinetics and the kinetic constants are well known and the modeling of this reactive extrusion process has proved to be realistic and accurate. Note de contenu : - CASE STUDY AND METHODOLOGY : EVA transesterification - Modeling - OPTIMIZATION : Optimization of processing parameters - Optimization of screw profile - SCALE-UP DOI : https://doi.org/10.3139/217.3958 En ligne : https://drive.google.com/file/d/1GwITc2fxsXwSC452KIaZof-rXRs03tPh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35064 [article]

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