Abstract
The effect of turbulence on the rate of electrochemical reactions under diffusion control is considered. Cylindrical cells with rotating electrodes were employed.Experimental results are interpreted in terms of Wranglén's treatment of turbulence recently given. Accordingly the limiting current density is proportional to the 3/5th power of fluid velocity and to the 1/3rd power of Schmidt number.The dependence of the kinetic constant on viscosity and diffusivity indicates a mechanism of ionic mass transfer based on the penetration of eddies into the laminar sublayers.
Highlights
THE effect of forced convection on the rate of electrochemical reactions has been studied in various particular cases under streamline and turbulent flow, with different types of cells
One interesting approach to the problem of turbulence consists in the study of its effect on the rate of electrochemical reactions under mass-transfer control, with cylindrical electrodes concentrically arranged in such a way that the inner rotating one is the stirring device; the reactions are studied on the surfaces of both the rotating or the tied electrode according to the circumstances
The ionic mass-transfer process in the turbulent regime has been studied by employing three electrochemical reactions under different experimental conditionsthe electrodeposition of copper on copper electrodes from copper-sulphate-sulphuric-acid solutions with glycerol added to change the Schmidt number, and the redox reactions involved in the electrolysis of potassium ferro- and ferricyanide with a large excess of sodium hydroxide
Summary
Divisi6n Ingenieria Quimica, Facultad de Ciencias Fisicomatematicas, Universidad. &&m&-The effect of turbulence on the rate of electrochemical reactions under diffusion control is considered. R&un&-On a &tudi&l’influence de le turbulence sur la vitesse de reactions 6lectrochimiques contral&es par le transfert massique en employant des cellules cylindriques avec &&odes toumantes. I..es r<ats exptrimentaux sont interpr&& 51I’aide des considCrations thCoriques sur la turbulence r&cemment d&eloppCes par Wranglkn. La variation de la constante cinetique avec la viscosit[6] et le coefficient de diffusion indiquent certainement un mkanisme du transfert massique base sur la p&n&ration des tourbillions dans la couche laminaire sous-jacente. Die experimentellen Ergebnisse werden anhand der vor kurzem von Wranglkn entwickelten theoretischen Betrachtungen iiber die Turbulenz interpretiert. Dementsprechend ist die Grenzstromdichte proportional zur 0,6ten Potenz der StrSmungsgeschwindigkeit und zur 3. Die AbhIngigkeit der kinetischen Konstante von der ZLhigkeit und vom Diffusionskoeffizienten deutet sicher darauf hin, dass beim Mechanismus des Stofftransportes ein Eindringen der Wirbel in die laminare Unterschicht im Spiel ist
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