The gas removal process during electrolysis is studied with the aim of identifying hydrodynamic transitions, analogous to those which occur in boiling. The local peak in the electrolysis gas flux is observed during electrolysis from a horizontal cylindrical cathode. This transition point is shown to correspond with Moissis and Berenson’s “first transition” in nucleate pool boiling. A prediction of the transition, applicable to either boiling or electrolysis, is developed for the cylindrical heater (or cathode) arrangement. It is compared with 12 experimental data for boiling and electrolysis, and its limitations are discussed. Finally, some attributes of the regime of film electrolysis are identified and discussed.

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