Please use this identifier to cite or link to this item:
|Interfacial instabilities of a fluid annulus in a rotating Hele-Shaw cell
|Carrillo Galdó, Lluís
Soriano i Fradera, Jordi
Ortín, Jordi, 1959-
|Mecànica de fluids
|American Institute of Physics
|We have studied the interfacial instabilities experienced by a liquid annulus as it moves radially in a circular Hele-Shaw cell rotating with angular velocity Omega. The instability of the leading interface (oil displacing air) is driven by the density difference in the presence of centrifugal forcing, while the instability of the trailing interface (air displacing oil) is driven by the large viscosity contrast. A linear stability analysis shows that the stability of the two interfaces is coupled through the pressure field already at a linear level. We have performed experiments in a dry cell and in a cell coated with a thin fluid layer on each plate, and found that the stability depends substantially on the wetting conditions at the leading interface. Our experimental results of the number of fingers resulting from the instability compare well with the predictions obtained through a numerical integration of the coupled equations derived from a linear stability analysis. Deep in the nonlinear regime we observe the emission of liquid droplets through the formation of thin filaments at the tip of outgrowing fingers.
|Reproducció del document publicat a: http://dx.doi.org/10.1063/1.870419
|It is part of:
|Physics of Fluids, 2000, vol. 12, p. 1685-1698
|Appears in Collections:
|Articles publicats en revistes (Física Quàntica i Astrofísica)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.