Convective diffusion of electrolytic ions to a rotating spherical electrode has been investigated experimentally over the range of Reynolds numbers from 200 to 40,000, and Schmidt numbers between 920 and 37,000. The study was carried out by measuring the limiting currents for the reductions of ferricyanide and tri‐iodide ions with a platinum hemispherical electrode. The results confirm the validity of a mass transfer theory reported previously for Reynolds numbers within the range 200–15,000. At Reynolds numbers above 15,000, the flow becomes turbulent, and the rate of mass transfer varies with Re 0.67 . The characteristics of fluid flow around the spherical electrode were observed by generating dyes electrochemically near the pole of rotation.
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Der‐Tau Chin (1971) studied this question.