Abstract
The effect of the insulation of a circular isolated electrode on the measurement of local mass transfer rates by the electrochemical method was investigated theoretically and experimentally. Three kinds of model for the velocity profile adjacent to the electrode were proposed and compared with experimental results, which were obtained with four kinds of isolated electrode in twodimensional flow. It was found that the apparent local mass transfer coefficients for an isolated electrode with insulation coaxially around it were rather greater than the true values. The ratio between these two coefficients was a function of the outer radius of the insulation, r2 and the relative area of the isolated electrode, Ø. The experimental results were in good agreement with the theoretical results. The results might be applicable to estimating true local mass transfer coefficients from apparent ones.
