| Titre : | Drop formation in non-newtonian jets at low Reynolds numbers (2009) |
| Auteurs : | V. Dravid, Auteur ; P. B. Loke, Auteur ; C. M. Corvalan, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of fluids engineering (Vol. 130 N° 8, Août 2008) |
| Article en page(s) : | 8 p. |
| Note générale : | Fluids engineering |
| Langues : | Anglais |
| Tags : | Drops ; shear (mechanics) ; jets ; atellites ; Reynolds number ; pinch effect (plasma physics) ; equations ; water ; engineering simulation ; pressure ; flow (dynamics) |
| Résumé : | The objective of this study was to develop an experimentally verified computational model that accurately predicts evolution of shear-thinning liquid jets. A secondary objective was to investigate the formation of satellite drops and to determine conditions under which their diameter can be controlled. The model employs the Galerkin finite/element approach to solve the complete two-dimensional set of axisymmetric governing equations and the corresponding kinematic and dynamic boundary conditions at the free surface. The effect of shear-thinning behavior on breakup was studied in detail for the case of an infinitely long non-Newtonian jet. It was found that shear-thinning behavior may be useful in controlling satellite drop sizes. (We observe that increasing the shear-thinning behavior at Re∼5 leads to an initial increase in the satellite drop size, followed by a subsequent decrease.) Comparison of model predictions with experimental data is presented for the case of a shear-thinning non-Newtonian jet. The experimental liquid was pumped through a capillary and drop shapes obtained using a high speed camera. The experimentally obtained shapes were compared to those predicted by the model and found to be in good agreement. |
| En ligne : | http://fluidsengineering.asmedigitalcollection.asme.org/Issue.aspx?issueID=27329&direction=P |
