Hydrodynamics of cathode films

A h ydrodynamical t heory of t he ca thode diffusion layer based on t he assumption of a uniform density reduction at t he cathode surface is presented . By means of an approximate solution for t he flow and t he diffusion eq uations, t he layer dimensio ns, t he velocity distribu tions, and t he densities are determin ed. Further d erivations from t he solutions directly applicable to results obtained by t he freezing method are effected . The d ata of Brenner on copper and nickel baths a re considered. Usin g t he observ ed values of t he d ensity reductions at t he cathode surface, t he maximum width of t he layer, t he average d ensit ies for a given distan ce from t he cathode, and t he mobilities of t he ca tions are determined and co mpared with t he observations. The agreement between observed and co mputed values is regarded as fairl y sat isfac tor y .