Abstract
A technique of two‐wavelength holographic interferometry was applied to simultaneously measure the concentration profiles of Cu2+ ion and H+ ion near a plane vertical cathode placed in an unstirred aqueous solution containing and excess . It was revealed that the measured concentration profiles of Cu2+ ion and H+ ion are approximated with the parabolic equations of horizontal distance from cathode surface and that the concentration gradient of Cu2+ ion at the cathode surface is larger in solution than in solution at the same cathodic current density and vertical distance. The following matters were also clarified: (i) the nondimensional rate of ionic mass transfer is shown as a function of Rayleigh number based on the boundary layer theory, and (ii) the effect of the addition of excess is expressed by a parameter which is the ratio of Rayleigh numbers in solution and in solution under the conditions of the uniform distribution of cathodic current density and an excess of .
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