Study of dispersive and distributive mixing in a converging pipe / Mehdi Mostafaiyan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 3 (07/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 3 (07/2016) . - p. 327-335 Titre : Study of dispersive and distributive mixing in a converging pipe Type de document : texte imprimé Auteurs : Mehdi Mostafaiyan, Auteur ; S. Wiessner, Auteur ; G. Heinrich, Auteur Année de publication : 2016 Article en page(s) : p. 327-335 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Polymères  'Mélange  distributif'  dispersif'  Rhéologie  'Etat  fondu' Index. décimale : 668.4 Plastiques, vinyles Résumé : The creeping flow of a polymeric melt in a converging pipe is analyzed using an in-house finite element code. An introduced power-law model considers the shear thinning behavior of the viscous liquid. Furthermore, distributive and dispersive mixing processes are evaluated with the mean strain function and the Manas-Zloczower mixing index, respectively. Using a parametric study, the dependency of the mixing criteria on the rheological and geometrical factors is investigated. Finally, a new analytical expression for the evaluation of the distributive mixing is suggested, based on simplifying assumptions and a curve fitting method. Note de contenu : - SIMULATION CONSIDERATION : Governing equations - Numerical solution - Geometrical parameters - Boundary condition - MIXING : Distributive mixing - Dispersive mixing - VERIFICATION AND MESH INDEPENDENCY - APPROXIMATE EXPRESSION FOR DISTRIBUTIVE MIXING DOI : 10.3139/217.3179 En ligne : https://drive.google.com/file/d/1IXNlDkpX16cxeiAfJYTz-PNPBR-6DT31/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26645 [article]

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Study of distributive mixing in a journal bearing flow geometry / Mehdi Mostafaiyan in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 1 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 1 (2022) . - p. 70-82 Titre : Study of distributive mixing in a journal bearing flow geometry Type de document : texte imprimé Auteurs : Mehdi Mostafaiyan, Auteur ; Sven Wießner, Auteur ; Gert Heinrich, Auteur Année de publication : 2022 Article en page(s) : p. 70-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Fluides, Mécanique des Mélange Rhéofluidifiants Index. décimale : 668.4 Plastiques, vinyles Résumé : We implicitly assess the distributive mixing of generalized Newtonian fluids with shear-thinning behavior in a journal bearing flow geometry. For this purpose, we firstly develop a finite element code to calculate the flow field parameters. Our numerical algorithm splits the viscous stress tensor into arbitrary Newtonian stress and a source term, which grows gradually during the iterative solution. Therefore, we get a better converging solution than the Picard method, especially for highly shear-thinning fluids. Secondly, considering two inert fluids in the mixing domain, we employ a Lagrangian-Eulerian approach to predict the shape of the interface between two fluids. The results of our numerical analysis provide us the required information to evaluate three implicit mixing criteria: the concentration variance, the striation thickness, and the mean strain function. Then we conduct a parametric study to investigate the effects of different parameters (geometry and rheology) on the distributive mixing state. In addition, we discuss which mixing criteria provide a better evaluation for distributive mixing. Note de contenu : - THE FLOW PROBLEM AND THE SOLUTION METHOD : The flow field calculations - The two-phase flow problem - THE MIXING CRITERIA - RESULTS AND DISCUSSIONS : The effect of the shear-thinning behavior - The effect of the inner cylinder displacement - The effect of the inner rotating cylinder radius - Table 1 : The ranges of the involved parameters in the distributive mixing in the journal bearing flow DOI : https://doi.org/10.1515/ipp-2021-4145 En ligne : https://drive.google.com/file/d/14ggmb9_mGZauac-zPMKgUvaiNNeQq-x_/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38442 [article]

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