MASS-TRANSFER CONDITIONS AT A CATHODE SUPPORT PLATE IN AN ELECTROCHEMICAL-CELL

The presence of turbulence promoters in an electrochemical cell increa ses the intensity of local turbulence which enhances the limiting curr ent density and hence the mass-transfer coefficient at the transfer su rface. The regularity of their geometrical configuration induces a pse udo-uniformity of the spatial distributions of the local mass-transfer coefficients. Limiting current data have been obtained at point coppe r electrodes flush-fitting on a cathode support plate in the presence of rectangular turbulence promoters. The effect of the flow rate of th e electrolyte, the height of the promoter and the spacing between the promoters have been studied. The data are best correlated by the follo wing equation: J(D) = 390Re(0.87)(S/H)(-0.15) where S is the promoter spacing (m) and H the promoter height (m).