Abstract
A new hydrodynamic model describing mass transfer effects at gas evolving electrodes is developed. A quantitative description of the effects is derived by solving for the appropriate components of the Navier-Stokes equations under conditions of bubble coalescence and absence of the latter. In the regime of frequent coalescence, the average thickness of the Nernst diffusion layer is given by δ av = D/( U y ) av and by δ av = [ Dc e L/( U x ) av] 1 3 otherwise. The predicted diffusion layer thicknesses are found to be in fair agreement with available data in the literature.
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