Numerical investigation of effect of rotor phase angle in partially-filled rubber mixing / S. R. Das in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 3 (07/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 3 (07/2017) . - p. 343-354 Titre : Numerical investigation of effect of rotor phase angle in partially-filled rubber mixing Type de document : texte imprimé Auteurs : S. R. Das, Auteur ; H. Poudyal, Auteur ; Abhilash J. Chandry, Auteur Année de publication : 2017 Article en page(s) : p. 343-354 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Analyse des flux de matières et d'énergie Analyse numérique Caoutchouc Mélange Rhéologie Rotors Index. décimale : 668.4 Plastiques, vinyles Résumé : Among several operational parameters such as rotor speed, fill factor and ram pressure, the orientation of the mixing rotors with respect to each other plays a significant role in the mixing performance. An understanding of the flow field and mixing characteristics associated with the orientations of the rotors will help in obtaining a final product with a better quality. For that purpose three phase angle orientations: 45°, 90° and 180° are investigated here in a 75% filled chamber with two rotors counter-rotating at an even speed of 20 min–1. Two dimensional, transient, isothermal, incompressible simulations are carried out using a CFD code. While an Eulerian multiphase method was used to solve for the transport variables in the two phases: rubber and air, the volume of fluid (VOF) method was used to solve for the interface between the two phases. A non-Newtonian Carreau-Yasuda model was used to characterize rubber. Massless particles were injected in the domain to calculate statistical quantities in order to assess dispersive and distributive mixing characteristics associated with rotor orientations. The flow field is analyzed via pressure and velocity contours. Dispersive mixing was analyzed through histograms of mixing index and cumulative probability distribution functions of maximum shear stress experienced by the particles. Distributive mixing was quantified statistically using cluster distribution index and interchamber material transfer. The phase angle of 180° was found to perform the best in terms of both dispersive and distributive mixing characteristics. Note de contenu : - PHYSICAL PROBLEM DESCRIPTION : GEOMETRY AND MATERIALS - NUMERICAL METHODS - GOVERNING EQUATIONS - RESULTS AND DISCUSSION : Flow analysis - Dispersive mixing - Distributive mixing DOI : 10.3139/217.3346 En ligne : https://drive.google.com/file/d/1oWpSHFLXQYniMkskC6pJWZUVqJcaJloW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28836 [article]

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