PMID: 22587176May 17, 2012Paper

Buoyancy-driven convection may switch between reactive states in three-dimensional chemical waves

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
L Šebestíková, M J B Hauser

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 ...Continue Reading

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Citations

Oct 2, 2012·Chaos·Federico RossiJorge Carballido-Landeira
Aug 3, 2014·The Journal of Chemical Physics·Eva Pópity-TóthAgota Tóth
Oct 27, 2016·The Journal of Chemical Physics·R Tiani, L Rongy
Nov 5, 2014·Physical Chemistry Chemical Physics : PCCP·Dezső HorváthÁgota Tóth
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Oct 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·L Sebestíková
Mar 24, 2021·The Journal of Chemical Physics·Marcello A BudroniLaurence Rongy

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