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Title: Radial displacement of a fluid annulus in a rotating Hele-Shaw cell
Author: Carrillo Galdó, Lluís
Soriano i Fradera, Jordi
Ortín, Jordi, 1959-
Keywords: Dinàmica de fluids
Fluid dynamics
Issue Date: 1999
Publisher: American Institute of Physics
Abstract: The radial displacement of a fluid annulus in a rotating circular Hele<br>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 interfacemotion 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 is obtained as a function of Ca.
Note: Reproducció del document publicat a:
It is part of: Physics of Fluids, 1999, vol. 11, num. 4, p. 778-785
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ISSN: 1070-6631
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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