Radial displacement of a fluid annulus in a rotating Hele¿Shaw cell


Autoria(s): Carrillo Galdó, Lluís; Soriano i Fradera, Jordi; Ortín, Jordi, 1959-
Contribuinte(s)

Universitat de Barcelona

Data(s)

04/05/2012

Resumo

The radial displacement of a fluid annulus in a rotating circular Hele-Shaw cell has been investigated experimentally. It has been found that the flow depends sensitively on the wetting conditions at the outer interface. Displacements in a prewet cell are well described by Darcy's law in a wide range of experimental parameters, with little influence of capillary effects. In a dry cell, however, a more careful analysis of the interface motion is required; the interplay between a gradual loss of fluid at the inner interface, and the dependence of capillary forces at the outer interface on interfacial velocity and dynamic contact angle, result in a constant velocity for the interfaces. The experimental results in this case correlate in the form of an empirical scaling relation between the capillary number Ca and a dimensionless group, related to the ratio of centrifugal to capillary forces, which spans about three orders of magnitude in both quantities. Finally, the relative thickness of the coating film left by the inner interface, alpha i, is obtained as a function of Ca.

Identificador

http://hdl.handle.net/2445/24903

Idioma(s)

eng

Publicador

American Institute of Physics

Direitos

(c) American Institute of Physics, 1999

info:eu-repo/semantics/openAccess

Palavras-Chave #Mecànica de fluids #Revestiments #Capil·laritat #Viscositat #Fluid mechanics #Coatings #Capillarity #Viscosity
Tipo

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion