Turbulent flow and mass transfer on a rotating hemispherical electrode

Using the Karman‐Pohlhausen integral method, an analysis has been made for turbulent flow on a rotating hemispherical electrode mounted on an inert support rod of equal radius. The resulting friction coefficient is then substituted into the Chilton‐Colburn relation to give a rate equation for mass transfer at high Schmidt numbers. Experiments with a diffusion‐controlled electrolytic system over a range of Sc from 910 to 6,300 confirm the validity of the theory for Re > 40,000. A comparison with the results of previous heat and mass transfer measurements reveals that the turbulent flow on the present geometry is different from that on a rotating sphere and on a hemispherical electrode mounted on a support rod of larger radius.