Two-point Padé approximation of mass transfer rate at microdisc electrodes in a channel flow for all Péclet numbers

The problem of mass transfer at a microdisc electrodes placed in a parabolic steady channel flow is considered. Under suitable conditions, the transfer rate depends only on the Péclet number (a dimensionless measure of shear rate) and on the geometry of the electrode. We present a calculation of the mass transfer rate for a disc electrode for all Péclet number using two-point Padé approximations. The results are compared with existing analytical and experimental results.