| Titre : |
Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids |
| Type de document : |
texte imprimé |
| Auteurs : |
Huan-Chang Tseng, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 447-455 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Etat fondu (matériaux)
Polyéthylène basse densité
Rhéologie
Rhéométrie
Simulation par ordinateur
Viscoélasticité
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
In capillary rheometry of a polymer melt, the total pressure drop consists of three primary components: shear viscosity, extensional viscosity, and normal stress differences. Traditionally, viscoelastic constitutive equations have been used to produce accurate predictions regarding the pressure drop. It is difficult to investigate the primary components in past experimental measurements and numerical computations. The useful improvement of the classic White-Metzner viscoelastic constitutive equation coupled with the weighted shear/extension viscosity is performed in isothermal capillary flow simulations. It is significant to analyze the extension-induced pressure drop for a short die and the shear-induced pressure drop for a long die, along with a small contribution of normal stress differences. |
| Note de contenu : |
- GNF shear viscosity
- GNF-X weighted shear/extensional viscosity
- WMT-X viscoelastic constitutive equation
- Table 1 : Model parameters of material functions for a LDPE melt at 150 °C
- Table 2 : For a LDPE melt in capillary rheometry with a short die with aspect ratio of L/D = 0.2, the total pressure drop consists of three components, ΔP S , ΔP E , and ΔP N .
- Table 3 : For a LDPE melt in capillary rheometry with a long die with aspect ratio of L/D = 20, the total pressure drop consists of three components, ΔP S , ΔP E , and ΔP N |
| DOI : |
https://doi.org/10.1515/ipp-2022-4322 |
| En ligne : |
https://drive.google.com/file/d/1VHLhRybQ3B6B_lOcerg2aJ3IXuMZTnw2/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40107 |
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 4 (2023) . - p. 447-455
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Numerical investigation of pressure drop within isothermal capillary rheometry for viscous and viscoelastic fluids in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 4 (2023)
