Analyzing the influence of surface renewal on diffusive mass transport in vented single-screw extruders / Christian Marschik in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 3 (07/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 3 (07/2017) . - p. 387-393 Titre : Analyzing the influence of surface renewal on diffusive mass transport in vented single-screw extruders Type de document : texte imprimé Auteurs : Christian Marschik, Auteur ; B. Löw-Baselli, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2017 Article en page(s) : p. 387-393 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Matières plastiques -- Extrusion Modèles numériques Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : We present a semi-numerical modeling approach to analyzing the role of surface renewal during bubble-free devolatilization in vented single-screw extruders. To demonstrate the significance of surface renewal in the mass transport of volatiles, we derived approximate analytical solutions for the two-dimensional circulatory flow in a partially filled screw channel, placing special emphasis on the melt pool that forms in front of the active flight. By applying the resulting velocity field to the governing conservation equation for the volatile concentration in the polymeric phase, the convective influence of the polymer flow on mass transport is taken into account. The resulting convection-diffusion equation, which is solved numerically using the finite-volume method, provides both qualitative and quantitative insights into how volatile depletion in the melt pool is related to the flow field developed. Thus, we clearly demonstrate that surface renewal improves mass transport efficiency considerably, even at very low screw speeds. Note de contenu : DEVOLATILIZATION IN VENTED SINGLE-SCREW EXTRUDERS : Mass transport in partially filled screw channels - Modeling diffusive mass transport in the melt pool - MODELING FRAMEWORK : Modeling the flow in the melt pool - Modeling diffusive mass transport in moving fluids - RESULTS AND DISCUSSION : Circulatory flow in the melt pool - Influence of surface renewal on diffusive mass transport - Influence of test parameters DOI : 10.3139/217.3373 En ligne : https://drive.google.com/file/d/1r3j9c2fG8H0VagHWgCOr3jqZyDxlzMFY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28840 [article]

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A generalized 2D output model of polymer melt flow in single-screw extrusion / S. Pachner in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 2 (05/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 2 (05/2017) . - p. 209–216 Titre : A generalized 2D output model of polymer melt flow in single-screw extrusion Type de document : texte imprimé Auteurs : S. Pachner, Auteur ; B. Löw-Baselli, Auteur ; M. Affenzeller, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2017 Article en page(s) : p. 209–216 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement bidimensionnel Etat fondu (matériaux) Extrudeuse monovis Fluides non newtoniens Matières plastiques -- Extrusion Modèles mathématiques Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The multidimensional output-pressure behavior of non-Newtonian fluids in single-screw extrusion can only be determined by using numerical methods. We present two methods which employ mathematical models building on analytic equations developed using an evolutionary heuristic optimization algorithm. Both allow fast and stable calculation of the 2-dimensional throughput–pressure gradient relationship of single-screw extruders, rendering cost-intensive CFD simulations of the output-pressure behavior redundant. A performed error analysis showed that our methods yield good approximations of the numerically determined data. Note de contenu : - STATE OF THE ART - MODELING : Symbolic regression - Developing analytic equations - RESULTS AND DISCUSSION DOI : 10.3139/217.3326 En ligne : https://drive.google.com/file/d/1rlBYGc0AvsIdyuok0sEu3t4-HSmMzKOR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28500 [article]

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