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Experiments in a rotating Hele-Shaw cell
Carrillo Galdó, Lluís; Magdaleno Escar, Francesc Xavier; Casademunt i Viader, Jaume; Ortín, Jordi, 1959-
Universitat de Barcelona
We introduce a modification to Hele-Shaw flows consisting of a rotating cell. A viscous fluid (oil) is injected at the rotation axis of the cell, which is open to air. The morphological instability of the oil-air interface is thus driven by centrifugal force and is controlled by the density (not viscosity) difference. We derive the linear dispersion relation and verify the maximum growth rate selection of initial patterns within experimental uncertainty. The nonlinear growth regime is studied in the case of vanishing injection rate. Several characteristic lengths are studied to quantify the patterns obtained. Experimental data exhibit good collapse for two characteristic lengths, namely, the radius of gyration and the radial finger length, which in the nonlinear regime appear to grow linearly in time.
26-07-2011
Dinàmica de fluids
Química de superfícies
Fluid dynamics
Surface chemistry
c) The American Physical Society, 1996
Artículo
The American Physical Society
         

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