| Titre : |
Three-dimensional simulation of vortex growth within entry flow of a polymer melt |
| Type de document : |
texte imprimé |
| Auteurs : |
Huan-Chang Tseng, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 126-132 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Ecoulement extensionnel
Ecoulements tourbillonnaires
Etat fondu (matériaux)
Imagerie tridimensionnelle
Rhéologie
Simulation par ordinateur
Viscosité
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The corner vortex phenomenon occurring in entry flow is relevant to both polymer rheology and polymer processing. The famous viscoelastic constitutive equations in numerical computations of fluid mechanics have always had limited relevance at low apparent shear rates. However, three-dimensional (3D) simulations of viscoelastic fluids have been rarely found in advanced rheology. Recently, the GNF-X (eXtended Generalized Newtonian Fluid) constitutive equation of the weighted shear/extensional viscosity developed in advanced rheology of complex fluids has been incorporated into state-of-the-art predictive engineering tools. Thereby, 3D numerical simulations of entry flow were performed for a LDPE (low-density polyethylene) melt. As a validation, the predicted vortex streamlines are in good agreement with related experimental observations. More importantly, the simulation results show the vortex growth with respect to apparent shear rates, contraction ratios, and inlet angles. In particular for extensional viscosity, the stronger extension hardening characteristic yields a large vortex size. |
| Note de contenu : |
- Table 1 : Parameters of the Carreau model for the shear viscosity of LDPE melt at 150 °C.
- Table 2 : Parameters of the Trouton ratio for the extensional viscosity of LDPE melt at 150 °C. |
| DOI : |
https://doi.org/10.1515/ipp-2022-4277 |
| En ligne : |
https://drive.google.com/file/d/1R1Nq5YhFwAdfapJJLp28cxKT2kyIUXw1/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39200 |
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 1 (2023) . - p. 126-132
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