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Chemical reaction for mixing studies

Emilie Guilbert1, Christophe Almarcha1, and Emmanuel Villermaux1,2,*

  • 1Aix Marseille Université, CNRS, Centrale Marseille, IRPHE UMR 7342, 13384 Marseille, France
  • 2Institut Universitaire de France, 75005 Paris, France

  • *emmanuel.villermaux@univ-amu.fr
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Phys. Rev. Fluids 6, 114501 – Published 16 November, 2021

DOI: https://doi.org/10.1103/PhysRevFluids.6.114501

Abstract

We introduce an original chemical reaction between two transparent reactant solutions (fluorescin and potassium ferricyanide), producing a fluorescent product in water (fluorescein). The reaction has a tunable kinetics, allowing the quantitative investigation of the interplay between molecular diffusion and reaction kinetics in various reactant field topologies. We document the chemical reaction kinetics and its sensitivity to ambient pH, temperature, reactants concentrations, etc., and we implement it in two simple reactant-contacting geometries in a Hele-Shaw cell. The resulting reaction-diffusion zones and product formation rates exhibit either the reaction-controlled or diffusion-controlled regimes, as well as a new “diffusio-chemical” regime which we show to be inherent to the early time transient dynamics of any bimolecular reaction between initially segregated reactants. The potential interest of this reaction, opening prospects for the study of reactive mixing, is underlined.

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Chemical reactions rectify mixtures composition

Emilie Guilbert and Emmanuel Villermaux
Phys. Rev. Fluids 6, L112501 (2021)

Article Text

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Outline

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Phys. Rev. Fluids 6, 114501– Published 16 November, 2021
  • Received 22 December 2020
  • Accepted 27 October 2021
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