Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/18747
Title: Experiments of periodic forcing of Saffman-Taylor fingers
Author: Torralba Cuello, Mireia
Ortín, Jordi, 1959-
Hernández Machado, Aurora
Corvera Poiré, Eugenia
Keywords: Dinàmica de fluids
Experiments
Fluid dynamics
Experiments
Issue Date: 2008
Publisher: The American Physical Society
Abstract: We report on an experimental study of long normal Saffman-Taylor fingers subject to periodic forcing. The sides of the finger develop a low amplitude, long wavelength instability. We discuss the finger response in stationary and nonstationary situations, as well as the dynamics towards the stationary states. The response frequency of the instability increases with forcing frequency at low forcing frequencies, while, remarkably, it becomes independent of forcing frequency at large forcing frequencies. This implies a process of wavelength selection. These observations are in good agreement with previous numerical results reported in [Ledesma-Aguilar et al., Phys. Rev. E 71, 016312 (2005)]. We also study the average value of the finger width, and its fluctuations, as a function of forcing frequency. The average finger width is always smaller than the width of the steady-state finger. Fluctuations have a nonmonotonic behavior with a maximum at a particular frequency.
Note: Reproducció del document publicata: http://dx.doi.org/10.1103/PhysRevE.77.036207
It is part of: Physical Review E, 2008, vol. 77, p. 036207-1-036207-9
URI: http://hdl.handle.net/2445/18747
ISSN: 1063-651X
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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