MASS-TRANSFER TO POINT ELECTRODES ON SURFACE OF A ROTATING DISK

A zeroth order perturbation solutionis presented for the rate of laminatr mass transfer to three types of point electrodes embedded in the surface of an insulating rotating disk - those sensitive to radial, tangential, and local velocity components. It is shown that the diffusion current density on the point electrode increases with decreasing geometrical parameter defined as the ratio of the electrode size to the radial location of the electrode on the disk surface. With a properly chosen geometrical parameter, it is possible to obtain a current density ten times greater than that on the disk electrode at a given rotational speed.