title: Buoyancy-driven convection may switch between reactive states in three-dimensional chemical waves.
abstract: Traveling waves in an extended reactor, whose width cannot be neglected, represent a three-dimensional (3D) reaction-diffusion-convection system. We investigate the effects of buoyancy-driven convection in such a setting. The 3D waves traveled through horizontal layers of the iodate-arsenous acid (IAA) reaction solution containing excess of arsenous acid. The depth of the reaction solution was the examined parameter. An increase in the intensity of buoyancy-driven flow caused an increase of the traveling wave velocities. Convection distorted the front of the chemical waves. For layers deeper than h>13 mm, heat release became smaller than heat production causing the emergence of Rayleigh-Bénard convection cells. At the interface, a dependency of wave shape on solution depth was observed. For h<7 mm, the waves adopted a stable V-like shape, while for h>13 mm a parabolic shape dominated. For 7<h<13 mm, both shapes were realized with the same probability. Finally, an intermittent switch between stoichiometric regimes is observed as an unexpected effect of the buoyancy-driven convection. The switch is expressed by iodine enrichment in the product. Hence, the experiments demonstrate that the buoyancy-driven convective flow can cause long-lived, but nevertheless transient, changes in the chemical composition by inducing a local transition between different regimes of the IAA reaction.
authors.affiliation: Institute of Hydrodynamics, Academy of Science of the Czech Republic, Pod Patankou 30/5, 16612 Praha 6, Czech Republic. lenka@n2.cz
authors.forename: L
authors.initials: L
authors.lastname: Šebestíková
authors.forename: M J B
authors.initials: MJ
authors.lastname: Hauser
mesh_terms: D018053:Arsenites / Q000737:chemistry; D057446:Hydrodynamics; D007452:Iodates / Q000737:chemistry; D008962:Models, Theoretical
chemical_list: D018053:Arsenites; D007452:Iodates; C032793:arsenous acid