抄録
The theoretical equations of the temperature difference (Δt) in a flow of electrolytes between the electrolyte and the electrode surface were derived from the heat transfer theory and Joules heat caused by electrolytic current and overvoltage: in laminar flow Δt=Kliηl0.5/u0.5 and Kl=0.36 a1/3ν1/6/λ in turbulent flow Δt=Ktiηl0.2/u0.8 and Kt=6.67a1/3ν0.47/λ where i: current density, η: overvoltage, l: length of specimen, u: flow rate of electrolyte, a: thermal diffusivity, ν: kinematic viscosity, λ: thermal conductivity. The results of experiments in laminar flow of electrolytes were as follows: the theoretical temperature differences calculated by the above equation agreed well with the data obtained in the anodizing of aluminum where the measured overvoltages are constituted mainly by activation -and resistance-over-voltage. However, in the case of electro-plating and -dissolving, the experimental data were lower than the theoretical values owing to the IR drop and the concentration overvoltage contained in the measured overvoltage.
