[article]
| Titre : |
Influence of non-newtonian behaviour on the processing characteristics of wall-slipping materials |
| Type de document : |
texte imprimé |
| Auteurs : |
H. Potente, Auteur ; M. Kurte, Auteur ; H. Ridder, Auteur |
| Année de publication : |
2003 |
| Article en page(s) : |
p. 115-121 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Index. décimale : |
668.9 Polymères |
| Résumé : |
So far it has been assumed that when describing the flow process in single-screw extruder, the melt will be wall-adhering. Using certain process conditions, however, some materials such as PVCs, high-molecular PEs, elastomers, polymer suspensions, ceramic materials and food products become wall-slipping [1 to 4].
During simulation of the flow process using the Finite Element Method (FEM), the boundary condition of "wall-adhering" was substituted for "wall-slipping". The numeric results refer to one-dimensional, non-Newtonian, isothermal flow processes and have been evaluated accordingly.
Since the wall-slipping properties are dependent on critical shear stress, the influence of non-Newtonian behaviour on wall shear stress is illustrated by investigating the barrel and screw root surface. Conclusions with regard to wall-slipping properties may be drawn from the resulting upper and lower limits.
The effect of wall slippage on pressure/throughput behaviour is examined along with the various velocity profiles, resulting from different compression ratios, dimensionless critical shear stress, material-related constants and screw configuration. |
| DOI : |
10.3139/217.1730 |
| En ligne : |
https://drive.google.com/file/d/1zEsbxRxO7_ZXFLcDWrVUTXNWMv9avGS-/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3300 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 2 (06/2003) . - p. 115-121
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