Abstract
Sherwood numbers were determined for mass transfer of zinc in alkaline solutions with coevolution of hydrogen. The separation between the zinc and the hydrogen current was performed using polarization curves. The separation between Sherwood numbers due to natural and bubble convection was obtained by an additive law since hydrogen evolution took place only at current densities higher than the zinc limiting current density. It is shown that the contribution to mass transfer by bubbles, relative to natural convection, increases with both zinc concentration and hydrogen current density. Under industrial conditions of high zinc concentration (0.9 mmol/cm3 ) and high current densities (−0.24 A/cm2), the effect of the hydrogen bubbles is predominant even if the hydrogen current efficiency is low (3.3%), the Sherwood numbers being, respectively, 424 and 115. The data obtained in this work and others give support to the dimensionless correlation
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