Influence of thermal effects on buoyancy-driven convection around autocatalytic chemical fronts propagating horizontally

L. Rongy, G. Schuszter, Z. Sinkó, T. Tóth, D. Horváth, A. Tóth, A. De Wit

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The spatiotemporal dynamics of vertical autocatalytic fronts traveling horizontally in thin solution layers closed to the air can be influenced by buoyancy-driven convection induced by density gradients across the front. We perform here a combined experimental and theoretical study of the competition between solutal and thermal effects on such convection. Experimentally, we focus on the antagonistic chlorite-tetrathionate reaction for which solutal and thermal contributions to the density jump across the front have opposite signs. We show that in isothermal conditions the heavier products sink below the lighter reactants, providing an asymptotic constant finger shape deformation of the front by convection. When thermal effects are present, the hotter products, on the contrary, climb above the reactants for strongly exothermic conditions. These various observations as well as the influence of the relative weight of the solutal and thermal effects and of the thickness of the solution layer on the dynamics are discussed in terms of a two-dimensional reaction-diffusion- convection model parametrized by a solutal RC and a thermal R T Rayleigh number.

Original languageEnglish
Article number023110
JournalChaos
Volume19
Issue number2
DOIs
Publication statusPublished - 2009

Fingerprint

Thermal Effects
Buoyancy
buoyancy
Thermal effects
Convection
temperature effects
convection
Travelling Fronts
Rayleigh number
Reaction-diffusion
products
sinks
Density (specific gravity)
Jump
Vertical
Gradient
Closed
gradients
Influence
air

ASJC Scopus subject areas

  • Applied Mathematics
  • Physics and Astronomy(all)
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Influence of thermal effects on buoyancy-driven convection around autocatalytic chemical fronts propagating horizontally. / Rongy, L.; Schuszter, G.; Sinkó, Z.; Tóth, T.; Horváth, D.; Tóth, A.; De Wit, A.

In: Chaos, Vol. 19, No. 2, 023110, 2009.

Research output: Contribution to journalArticle

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AU - Tóth, A.

AU - De Wit, A.

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