A 3D simulation analysis of reactive flow in screw elements of closely intermeshing twin screw extruders / Ederley Ortiz-Rodriguez in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 442-451 Titre : A 3D simulation analysis of reactive flow in screw elements of closely intermeshing twin screw extruders : Scale-up calculations Type de document : texte imprimé Auteurs : Ederley Ortiz-Rodriguez, Auteur ; C. Tzoganakis, Auteur Année de publication : 2012 Article en page(s) : p. 442-451 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement permanent Extrudeuse bi-vis Modélisation tridimensionnelle Peroxydes Polypropylène Rhéologie Simulation par ordinateur Index. décimale : 668.9 Polymères Résumé : The peroxide-initiated degradation of polypropylene in conventional screw elements of closely intermeshing twin-screw extruders is analyzed by means of a three-dimensional (3D) simulation approach. The 3D simulations of the reacting flow are implemented under the assumption of steady-state flow conditions, and scale-up considerations are addressed by simulating screw elements of two different size extruders. The effects of the initial peroxide concentration and reference mass throughputs on processing parameters are analyzed in terms of the specified extruder size. In this study, the scaled-up mass throughput is determined under the assumption of constant residence time. For the implemented processing conditions, the final values of the weigh-average molecular weight (Mw) and polidispersity index (PDI) for both the reference and scaled-up screw elements are similar when the flow rate is close to that corresponding to the maximum conveying capacity of the screw elements. For more restricted flow conditions, however, lower values of both the Mw and PDI are obtained for the larger screw element. Additionally, a previously proposed scale-up procedure from one-dimensional (1D) simulations is evaluated by means of a 3D simulation analysis. The results of this evaluation show a good agreement between the trend of the 3D and 1D simulation results. Note de contenu : - Modeling considerations - Set up of the simulations and processing conditions - Discussion and results : Genral scale-up calculation analysis - Thermal time analysis DOI : 10.3139/217.2568 En ligne : https://drive.google.com/file/d/1X1cNmVTFhJmSjh-difgAne0WIojvpuB0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15767 [article]

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Scaling-up a reactive extrusion operation : A one-dimensional simulation analysis / Ederley Ortiz-Rodriguez in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 3 (07/2010) . - p. 242-250 Titre : Scaling-up a reactive extrusion operation : A one-dimensional simulation analysis Type de document : texte imprimé Auteurs : Ederley Ortiz-Rodriguez, Auteur ; C. Tzoganakis, Auteur Année de publication : 2010 Article en page(s) : p. 242-250 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion Polypropylène Tags : Polypropylène  'Extrusion  réactive'  'Specific  energy  consumption'  (SEC)  'Co-rotating  intermeshing  twin  screw  extruders'  (COITSEs)  'Polydispersity  index  'PDI)  Simulation  Analyse Index. décimale : 668.9 Polymères Résumé : The peroxide-initiated degradation of polypropylene is simulated by means of a one-dimensional (1D) reactive extrusion (REX) model. Two scale-up rules, namely, constant thermal time and specific energy consumption (SEC) are evaluated for co-rotating intermeshing twin screw extruders (COITSEs) of various sizes. The weight-average molecular weight (Mw) and the polydispersity index (PDI) are selected as the evaluation parameters for testing the scale-up procedures being analyzed. The results for the simulated operating conditions show that when the REX operation is scaled-up under constant thermal time, very good agreement is obtained between the Mw and PDI of the larger extruders and the values of these parameters corresponding to the reference extruder. For the constant SEC approach, more significant variations are observed for both of the aforementioned parameters. In the case of the constant thermal time scale-up approach, the effect of operating conditions of the reference extruder on the scaled-up operation is further analyzed. For a constant screw speed, when the reference mass throughput increases the predicted time of extrusion increases. Regarding the temperature of reaction, the higher increase of this parameter corresponds, in general terms, to the lower mass throughputs and higher screw speeds specified for the reference extruder. DOI : 10.3139/217.2346 En ligne : https://drive.google.com/file/d/1KVZ6c7KVBVt1uLyNXJKR45y_XXQLFjtL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9740 [article]

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