| Summary: | During two-phase electrolysis processes, for example for hydrogen production, there are bubbles which are created at
electrodes. This implies a great vertical motion source in the normal earth gravity field and then a quite important
natural two-phase convection. All other fields are then affected. Heat, mass and electricity transfers are modified due
to both bubbles screening (at surface and in volume) and to bubbles transport promotion. Many numerical modeling
for two-phase processes such as kerosene pulverization in engines or coal combustion sciences have shown the
difficulties of these multi-physics processes. Both particles and reactor scales must be considered according with a
strong coupling modeling. In these processes the particles injection is “in the flow”. In boiling or electrolysis
processes, a new difficulty is added: particles birth or injection is strongly coupled to the local flow properties and
leads to a complex boundary condition at surfaces. Electrical and electrochemical properties and processes are
disturbed. This disturbance can lead to the modification of the local current density and to anode effects for example.
There is few works concerning the local modelling of electrochemical processes during a two-phase electrolysis
process. There are also few local experimental measurements in term of chemical composition, temperature or current
density which will allow the numerical calculations validation. The present work shows the started numerical
modeling strategy and the first results, both experimental and numerical obtained.
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