Zhao, H.Casademunt i Viader, JaumeYeung, C.Maher, J. V.2009-10-062009-10-0619921050-2947https://hdl.handle.net/2445/9551A controlled perturbation is introduced into the Saffman-Taylor flow problem by adding a gradient to the gap of a Hele-Shaw cell. The stability of the single-finger steady state was found to be strongly affected by such a perturbation. Compared with patterns in a standard Hele-Shaw cell, the single Saffman-Taylor finger was stabilized or destabilized according to the sign of the gap gradient. While a linear stability analysis shows that this perturbation should have a negligible effect on the early-stage pattern formation, the experimental data indicate that the characteristic length for the initial breakup of a flat interface has been changed by the perturbation.8 p.application/pdfeng(c) The American Physical Society, 1992Dinàmica de fluidsPertorbació (Dinàmica quàntica)Fluid dynamicsPerturbation (Quantum dynamics)info:eu-repo/semantics/article86558info:eu-repo/semantics/openAccess