In order to investigate the influence of suspended inert solids on the rate of mass transfer, limiting current densities for the reduction of ferric cyanide at a rotating disk were measured in the presence of 8∼40 % by volume of particles. Experiments were conducted with seven different particle diameters, and with rotation speeds in the range of 500∼3,000 rpm, using a 1.13 ㎝ diameter disk electrode.
It was found that at a given rpm upon addition of particles the limiting current density may increase to about three times its value without particles, and this increase was greater at high rotation speeds; the 15μm particles yielded the highest value.