INTEC 05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
A deeper insight into the dip coating process in the presence of insoluble surfactants: A numerical analysis
Autor/es:
DIEGO M. CAMPANA, SEBASTIÁN UBAL, MARÍA D. GIAVEDONI AND FERNANDO A. SAITA
Revista:
PHYSICS OF FLUIDS
Editorial:
AMER INST PHYSICS
Referencias:
Año: 2011 vol. 23 p. 1 - 11
ISSN:
1070-6631
Resumen:
A numerical investigation is carried out to study the effects of an insoluble surfactant on the dip coating of a flat substrate. Predictions of both the film thickness and the concentration of surfactant in the film as a function of the capillary number compare well with the solutions of a simpler asymptotic model based on the lubrication approximation. Streamline patterns confirm the existence of a stagnation point located in the bulk phase in the region of the dynamic meniscus ?a conjecture postulated forty years ago. The evolution of the flow patterns and the interfacial variables shows how the classical result of Landau and Levich is recovered as the coating speed is augmented. Finally, we show that the effect of inertia forces cannot be neglected when the viscosity of the coating liquid is low.
