| Titre : | Direct simulations of mixing of liquids with density and viscosity differences (2012) |
| Auteurs : | J. J. Derksen, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 51 N° 19, Mai 2012) |
| Article en page(s) : | pp. 6948-6957 |
| Note générale : | Industrial chemistry |
| Langues : | Anglais |
| Tags : | Viscosity Density Mixing |
| Résumé : | Simulations of flow and scalar transport in stirred tanks operated in transitional and mildly turbulent regimes (Re = 3000―12000) are presented. The moderate Reynolds numbers allow the flow to be simulated directly, without the use of turbulence closure or subgrid-scale models. The Newtonian liquids that are blended have different densities and/or viscosities, and the emphasis is on how these differences affect mixing times. The density difference is characterized by a Richardson number (Ri) that varies in the range of 0―0.5. The kinematic viscosity ratio is between 1 and 4. The results show that mixing times increase steeply with increasing Ri and that changing the tank layout can partly mitigate this effect. The viscosity ratio has a much weaker influence on the mixing time. |
| ISSN : | 0888-5885 |
| En ligne : | http://cat.inist.fr/?aModele=afficheN&cpsidt=25900249 |
