| Titre : |
Peculiar capillary rheometry results associated with compressibility like effects |
| Type de document : |
texte imprimé |
| Auteurs : |
Jean L. Leblanc, Auteur |
| Année de publication : |
2000 |
| Article en page(s) : |
p. 15-27 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Compressibilité
Etat fondu (matériaux)
Modèles mathématiques
Polymères
Rhéologie
Rhéométrie
|
| Index. décimale : |
532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) |
| Résumé : |
Capillary rheometry tests do not always yield straight plots of measured pressure versus die length-to-diameter ratio (the so-called Bagley plots). By considering a pressure dependent viscosity of molten polymers, a model is developed that allows to easily treat Pmeas vs. L/D data in order to directly obtain the ends (entrance and exit) pressure loss, the wall shear stress (at zero pressure) and a parameter β. The latter is the compressibility factor when there are no slip effects. The model is successfully used to treat either original or published experimental data. With filled rubber compounds containing various levels of processing aids (lubricants), negative β values are obtained in the low shear rate range, which demonstrates that wall slip and compressibility are antagonistic effects in capillary rheometry. By fitting the model (through non-linear regression) to capillary rheometer data, a non-ambiguous data treatment is then proposed, with the advantages of simplicity and no hypothesis about the flow behaviour of the material. |
| Note de contenu : |
- COMPRESSIBILITY EFFECTS IN CAPILLARY FLOW
- A MODEL FOR COMPRESSIBILITY-LIKE EFFECTS IN CAPILLARY RHEOMETRY
- APPLYING THE MODEL TO EXPERIMENTAL DATA : Pure polymers - Thermoplastic elastomers - Filled rubber compounds |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25806 |
in LES CAHIERS DE RHEOLOGIE > Vol. XVII, N° 1 (10/2000) . - p. 15-27
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Peculiar capillary rheometry results associated with compressibility like effects in LES CAHIERS DE RHEOLOGIE, Vol. XVII, N° 1 (10/2000)
