2 résultat(s) recherche sur le tag 'tubulaire''

Annular extrudate swell of a fluoropolymer melt / Evan Mitsoulis in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 535-546 Titre : Annular extrudate swell of a fluoropolymer melt Type de document : texte imprimé Auteurs : Evan Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2012 Article en page(s) : p. 535-546 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique) Etat fondu (matériaux) Fluoropolymères Rhéologie Simulation par ordinateur Viscoélasticité Tags : 'Extrudat  annulaire  gonflé'  'Polymère  fluoré'  'Matrice  tubulaire'  Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Annular extrudate swell is studied for a fluoropolymer (FEP) melt using a tubular die. The rheological data of the melt have been fitted using (i) a viscous model (Cross) and (ii) a viscoelastic one (the Kaye – Bernstein, Kearsley, Zapas/Papanastasiou, Scriven, Macosko or K-BKZ/PSM model). Numerical simulations have been undertaken to study the extrudate swell of the FEP melt in an annular die. Compressibility, thermal and pressure effects on viscosity, and slip at the wall were taken into account. In all cases, slip at the wall is the dominant contribution reducing the swelling when compared with corresponding no-slip simulations. The viscous (Cross) simulations show that the swell decreases with increasing apparent shear rate, which is opposite to what happens in the extrusion of viscoelastic melts. On the other hand, the viscoelastic (K-BKZ) simulations correctly obtain increasing swelling with increasing shear (flow) rates. It was found that due to the mild viscoelasticity of FEP and its severe slip at the wall the swelling of this melt is relatively small, reaching values of about 20% for a wide range of apparent shear rates, exceeding 5000 s–1. This is corroborated by experimental observations. Note de contenu : - Experimental - Governing equations and rheological modelling - Method of solution - Numerical results DOI : 10.3139/217.2601 En ligne : https://drive.google.com/file/d/1gZurKbIUSVgZqyRz5XWkF122H9o3e5xF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16631 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
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Overview of reactors for emulsion polymerization process / E. Saravanakumar in PAINTINDIA, Vol. LII, N° 10 (10/2002)

[article]  inPAINTINDIA > Vol. LII, N° 10 (10/2002) . - p. 41-52 Titre : Overview of reactors for emulsion polymerization process Type de document : texte imprimé Auteurs : E. Saravanakumar, Auteur Année de publication : 2002 Article en page(s) : p. 41-52 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Article  synthèse'  'Réacteur  tubulaire'  agité'  polymérisation'  'En  continu'  discontinu'  'Polymérisation  émulsion'  Latex  Polymère Index. décimale : 667.9 Revêtements et enduits Résumé : In emulsion polymerization, reactor type and operational condition have a marked influence on polymer properties such as distribution of molecular weight, microstructure of polymer and particle size. Reaction engineering for emulsion polymerization requires understanding of fluid dynamics and mixing, heat transfer, process monitoring, colloid science, microeconomics and the mechanisms and kinetics of the multiple chemical and physical reaction steps. Incorporating the developed knowledge in an integrated product process development effort would help to reduce costs, decrease time to market and increase product quality. Various types of reactors and their modification to satisfy the necessity of quality product have been reviewed in this paper. Note de contenu : - TYPE OF REACTORS - Batch process - Semi-batch process - Continuous process - Continuous stirred tank reactors ( CSTR's) - TUBULAR REACTOR - LOOP REACTOR - loop reactor process - Product quality - CONTINUOUS BENCH SCALE PROCESS - OTHER CONTINUOUS PROCESSES Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12414 [article]

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