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Auteur H. Poudyal |
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Fill factor effects in highly-viscous non-isothermal rubber mixing simulations / I. Ahmed in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)
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Titre : Fill factor effects in highly-viscous non-isothermal rubber mixing simulations Type de document : texte imprimé Auteurs : I. Ahmed, Auteur ; H. Poudyal, Auteur ; Abhilash J. Chandy, Auteur Année de publication : 2019 Article en page(s) : p. 182-194 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères
Caoutchouc
Caoutchouc -- Propriétés physiques
Caoutchouc -- Propriétés thermiques
Fluides non newtoniens
Modèles numériques
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : A finite volume technique in a commercial computational fluid dynamics (CFD) code is employed in this study to simulate transient, incompressible, non-Newtonian and non-isothermal rubber mixing. The simulation processes are conducted in a two-dimensional(2D) domain, where a mixing chamber partially-filled with rubber is equipped with a pair of two-wing non-intermeshing counter-rotating rotors. The main objective is to assess the effect of different fill factors of rubber on dispersive and distributive mixing characteristics by simulating 15 revolutions of the rotors rotating at 20 min−1. 50%, 60%, 70%, 75%, 80% and 90% are the six different fill factors chosen for the study. An Eulerian multiphase method has been applied to solve for the two different phases, rubber and air. The non-Newtonian property of rubber is handled using the shear rate dependent Carreau-Yasuda model, along with an Arrhenius function to include the temperature dependency. In addition to the governing equations related to the conservation of mass, momentum and energy, the volume of fluid (VOF) method is chosen to track the interface between air and rubber. With regard to the results, flow patterns, thermal distributions, viscosity behavior and volume fraction are analyzed for the different fill factors. In addition, dispersive and distributive mixing behavior is also assessed in detail using Lagrangian statistics, such as mixing index, cumulative distribution of maximum shear stress, cluster distribution index (CDI), scale of segregation (SOS) and length of stretch (LOS), calculated from massless particles. Both the Eulerian and Lagrangian results showed that fill factors between 70% and 80% presented the most reasonable and efficient mixing scenario, and also exhibited the best dispersive and distributive mixing characteristics combined. Note de contenu : - Geometry and materials
- Governing equations
- Computational model
- Results and discussion : Thermal distribution - Flow pattern - Rubber volume fraction - Dispersive mixing - Distributive mixingDOI : 10.3139/217.3694 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3694/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32394
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 182-194[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20883 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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
RotorsIndex. 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 mixingDOI : 10.3139/217.3346 En ligne : https://drive.google.com/file/d/1oWpSHFLXQYniMkskC6pJWZUVqJcaJloW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28836
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Code-barres Cote Support Localisation Section Disponibilité 19064 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional, non-isothermal simulations of the effect of speed ratio in partially-filled rubber mixing / H. Poudyal in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)
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Titre : Three-dimensional, non-isothermal simulations of the effect of speed ratio in partially-filled rubber mixing Type de document : texte imprimé Auteurs : H. Poudyal, Auteur ; I. Ahmed, Auteur ; Abhilash J. Chandy, Auteur Année de publication : 2019 Article en page(s) : p. 219-230 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calcul
Caoutchouc
Ecoulement tridimensionnel
Mélanges (chimie)
Rhéologie
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : Three-dimensional, transient, non-isothermal calculations have been carried out using a commercial computational fluid dynamics (CFD) software in a two-wing rotor-equipped chamber partially-filled (75% fill factor) with rubber, to analyze the mixing efficiency for three different rotor speed ratios of 1, 1.125 and 1.5. The moving mesh technique has been used to incorporate the motion of the rotors. The Eulerian based volume of fluid (VOF) method has been used to track the interface between the two fluids, which are rubber and air. To assign the highly viscous and non-Newtonian properties of rubber, the Carreau-Yasuda model along with an exact Arrhenius formulation that accounts for the shear and temperature dependent viscosity, has been used here. Governing equations including the continuity, momentum and energy equations have been solved to characterize the flow field and various mixing parameters. Eulerian-based fields such as velocity magnitude, viscous heat generation, and average temperature and viscosity are compared between cases with different speed ratios. Dispersive and distributive mixing behaviour are assessed through a Lagrangian approach that tracks the paths of a set of massless particles. Statistical quantities such as cumulative distribution of maximum shear stress, cluster distribution index, and axial and inter-chamber particle transfer rates are calculated and presented as well. Results showed that the speed ratio of 1.5 displayed the best dispersive and distributive mixing characteristics in comparison to the other cases. Note de contenu : - Governing equations
- Material properties and boundary conditions
- Results : Eulerian results : flow and heat transfer - Lagrangian results : dispersive and distributive mixing measuresDOI : 10.3139/217.3680 En ligne : https://drive.google.com/file/d/1u9g_UtA4YlEcu6gAGc8FUszdVBTZqS69/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32402
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 219-230[article]Réservation
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