Experimental investigation and theoretical prediction of extrudate swell using conformational rheological models / M. K. Yazdi in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 478-485 Titre : Experimental investigation and theoretical prediction of extrudate swell using conformational rheological models Type de document : texte imprimé Auteurs : M. K. Yazdi, Auteur ; A. Ramazani, Auteur ; H. H. Amoli, Auteur ; A. Kamyabi, Auteur Année de publication : 2012 Article en page(s) : p. 478-485 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carboxyméthylcellulose Giesekus, Modèle de Matières plastiques -- Extrusion:Polymères -- Extrusion Microstructures Polymères Polymères -- Structure Rhéologie Solutions aqueuses (chimie) Index. décimale : 668.9 Polymères Résumé : In this study the extrudate swell of polymer solutions is estimated using the microstructure of polymer molecules. When a flexible polymer chain goes through a narrow die shear stress exerting on the chain will cause the polymer chain to be stretched along the flow direction. After emerging from die all external stresses vanish immediately and the chains tend to recover their previous state due to elastic recovery. This phenomenon will results in a gradual increase in extrudate diameter and this is used as the key idea for estimating swell ratio. A Giesekus based conformational model was used in order to predict polymer chains microstructure everywhere in the domain. The resulting PDE set including, continuity, momentum, and conformational rheological model were solved using a finite volume method with the OpenFOAM software. Numerical results were compared with experimental data which were obtained for aqueous solutions of Carboxymethylcellulose. It was found that model predictions are in good agreement with experimental data. The results were also compared to results which were obtained by the Tanner relation which underestimates experimental data. Note de contenu : - Conformational models - Governing equations - Geometry and mesh - Estimation of swell DOI : 10.3139/217.2590 En ligne : https://drive.google.com/file/d/1mEL_Dr036aIPLyyMN92q2uZ5uCc77kOL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15771 [article]

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