Abstract
Rates of mass transfer were measured for the cathodic reduction of K3 Fe(CN)6 in a large excess of sodium hydroxide at a single sphere cathode stirred by oxygen evolved at a horizontal disc anode placed below. The effect of the oxygen discharge rate and sphere diameter were studied at different ferricyanide concentrations. The rate of mass transfer was found to increase by an amount ranging from 66% to 450% over the natural convection value depending on the operating conditions. The data were correlated using hydrodynamic boundary layer theory and Kolmogoroff's theory of isotropic turbulence. The data were found to fit the equation: Sh = 2 + 0.21 Sc 0.33 (ed s 4/v 3)0.268 where e is the rate of energy dissipation/unit mass of the liquid. Previous data on mass transfer at fixed beds of spheres stirred by counterelectrode oxygen bubbles were also correlated.
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Sedahmed, G.H. Mass transfer at gas sparged spherical electrodes. J Appl Electrochem 23, 167–172 (1993). https://doi.org/10.1007/BF00246955
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DOI: https://doi.org/10.1007/BF00246955