Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12831
Title: Nonlinear Saffman-Taylor instability
Author: Alvarez Lacalle, Enrique
Ortín, Jordi, 1959-
Casademunt i Viader, Jaume
Keywords: Dinàmica de fluids
Pertorbació (Dinàmica quàntica)
Fluid dynamics
Perturbation (Quantum dynamics)
Issue Date: 2004
Publisher: American Physical Society
Abstract: We show, both theoretically and experimentally, that the interface between two viscous fluids in a Hele-Shaw cell can be nonlinearly unstable before the Saffman-Taylor linear instability point is reached. We identify the family of exact elastica solutions [Nye et al., Eur. J. Phys. 5, 73 (1984)] as the unstable branch of the corresponding subcritical bifurcation which ends up at a topological singularity defined by interface pinchoff. We devise an experimental procedure to prepare arbitrary initial conditions in a Hele-Shaw cell. This is used to test the proposed bifurcation scenario and quantitatively asses its practical relevance.
Note: Reproducció digital del document proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevLett.92.054501
It is part of: Physical Review Letters, 2004, vol. 92, núm. 5, p. 054501-1-054501-4
URI: http://hdl.handle.net/2445/12831
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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