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EIP - GENIE ELECTROCHIMIQUE
EIP - GENIE ELECTROCHIMIQUE
EIP - GENIE ELECTROCHIMIQUE

> Equipes > EIP > GENIE ELECTROCHIMIQUE (EIP)

Modelling of Water Electrolysis

 

Alkalin Water Electrolysis

The Electrochemical engineering research group (IEP sub group) proposes thanks to the modelling to improve the operation of industrial electrochemical reactors

 The efficiency of industrial electrochemical processes strongly depends on mass transfer. For example, electrochemical reactions can be enhanced by pumped electrolyte flow, which increases mass transfer at the electrode surface. Alternatively, a flow can be induced by the electrochemical bubble production. Furthermore in alkaline water electrolysis process the additional resistance arising from partial coverage of the electrodes by the bubbles was critical in energy efficiency. A better understanding of bubble behavior would provide a scientific guidance to minimize this resistance and contribute to the development of hydrogen production. The developed approach in EIP group shows for Prx >1, that it is possible to predict the evolution of the bubble plumes along the electrodes in free and forced convection. It is observed that the most influent parameter is the bubble diameter, which depends on various parameters (e.g. electrolyte viscosity, pressure, current density).  ​​​​​​​

Figure 3. Experimentally measured velocity profiles versus simulation results and test bench of alkali electrolysis (membrane less) cell

Thanks to this results it is possible to optimize the operation of electrolyze using the analysis of classical dimensionless numbers such as Reynolds (forced) or Rayleigh (free) “like” number and equivalent Prandtl number.

mise à jour le 15 mai 2019

Univ. Grenoble Alpes