| 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 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 3 (07/2017) . - p. 387-393
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Analyzing the influence of surface renewal on diffusive mass transport in vented single-screw extruders in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 3 (07/2017)
