Self-Organized Traveling Chemo-Hydrodynamic Fingers Triggered by a Chemical Oscillator.
Pulsatile chemo-hydrodynamic patterns due to a coupling between an oscillating chemical reaction and buoyancy-driven hydrodynamic flows can develop when two solutions of separate reactants of the Belousov-Zhabotinsky reaction are put in contact in the gravity field and conditions for chemical oscillations are met in the contact zone. In regular oscillatory conditions, localized periodic changes in the concentration of intermediate species induce pulsatile density gradients, which, in turn, generate traveling convective fingers breaking the transverse symmetry. These patterns are the self-organized result of a genuine coupling between chemical and hydrodynamic modes.
†Nonlinear Physics Group, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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Escala
‡Nonlinear Physical Chemistry Unit, Service de Chimie Physique et Biologie Théorique, Faculté des Sciences, Université Libre de Bruxelles (ULB), CP231, 1050 Brussels, Belgium.
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Budroni
†Nonlinear Physics Group, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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Carballido-Landeira
‡Nonlinear Physical Chemistry Unit, Service de Chimie Physique et Biologie Théorique, Faculté des Sciences, Université Libre de Bruxelles (ULB), CP231, 1050 Brussels, Belgium.
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De Wit
†Nonlinear Physics Group, University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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Muñuzuri
BZ reaction; chemical waves; chemo-hydrodynamics; convection fingers; hydrodynamic instability