On Turbulent Flows with Fast Chemical Reactions. Part II. The Distribution of Reactants and Products Near a Reacting Surface

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Abstract
The structure of a reacting surface in a turbulent flow involving contiguous volumes of fluid with one reactant present and the other absent is studied by an idealized model. The analysis provides estimates of the several length scales involved and distributions of the reactants and product in the neighborhood of such a surface assuming that the diffusivity of species is much less than that of momentum. The analysis also indicates that the coupled dissipation terms arising in Part I must be considered negligibly small in the limit of infinite reaction rates. The results of an experiment involving the turbulent mixing of weak-acid and weak-base solutions are discussed and are shown to provide qualitative support for the picture of reacting surfaces evolving from this study. Salt produced by the reaction was detected using a single electrode conductivity probe with effective diameter about 5 microns.