| Titre : | Normalized ashurst-hoover scaling and a comprehensive viscosity correlation for compressed liquids (2012) |
| Auteurs : | Scott Bair, Auteur ; Arno Laesecke, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of tribology (Vol. 134 N° 2, Avril 2012) |
| Article en page(s) : | 08 p. |
| Note générale : | tribology |
| Langues : | Anglais |
| Index. décimale : | 621.5 (Energie pneumatique. Machinerie et outils. Réfrigération) |
| Tags : | elastohydrodynamic lubrication ; thermoelastohydrodynamic viscosity ; rheology ; lubricants |
| Résumé : | The recent move toward physics-based elastohydrodynamics promises to yield advances in the understanding of the mechanisms of friction and film generation that were not possible a few years ago. However, the accurate correlation of the low-shear viscosity with temperature and pressure is an essential requirement. The Ashurst-Hoover thermodynamic scaling, which has been useful for thermal elastohydrodynamic simulation, is normalized here in a manner that maps the viscosity of three widely different liquids onto a master Stickel curve. The master curve can be represented by a combination of two exponential power law terms. These may be seen as expressions of different molecular interaction mechanisms similar to the two free-volume models of Batschinski-Hildebrand and Doolittle, respectively. The new correlation promises to yield more reasonable extrapolations to extreme conditions of temperature and pressure than free-volume models, and it removes the singularity that has prevented wide acceptance of free-volume models in numerical simulations. |
| DEWEY : | 621.5 |
| ISSN : | 0742-4787 |
| En ligne : | http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JOTRE9000134000002021801000001&idtype=cvips&gifs=Yes&ref=no |
