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Hydrodynamics characteristics of hydrogen evolution process through electrolysis: Numerical and experimental studies

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  • El-Askary, W.A.
  • Sakr, I.M.
  • Ibrahim, K.A.
  • Balabel, A.

Abstract

A reliable numerical procedure using the control volume formulation has been built up for predicting the hydrogen-generation process. The hydrogen production is due to the flow of an electrolyte between cathode and anode at different current densities. A bubbly two-phase flow process has been considered and a mathematical model based on Eulerian–Eulerian two-fluids has been adopted. The transport equations have been solved for both phases with allowance of interfacial transfer of mass and momentum. The conservation equations have been discretized using a finite volume method and solved by the SIMPLE algorithm. Measurements have been carried out along a tested cell gap at different current densities to visualize the hydrogen generation process. New insights into the model of hydrogen bubble-size variation in the computations are considered. Comparisons of numerical results based on the model with both experimental measurements and results available in the literature have been performed. The results indicate that the developed numerical model accurately predicts the hydrogen production process. The study shows also that the best production process is reached by decreasing the main flow velocity. Increasing the current density and reducing the gap distance between the cathode and the anode of the electrochemical cell helps improving the hydrogen production process. The bubble-diameter formulation of the dispersed hydrogen gas considerably influences the local and global characteristics of two-phase stream.

Suggested Citation

  • El-Askary, W.A. & Sakr, I.M. & Ibrahim, K.A. & Balabel, A., 2015. "Hydrodynamics characteristics of hydrogen evolution process through electrolysis: Numerical and experimental studies," Energy, Elsevier, vol. 90(P1), pages 722-737.
    • Handle: RePEc:eee:energy:v:90:y:2015:i:p1:p:722-737
    DOI: 10.1016/j.energy.2015.07.108
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    References listed on IDEAS

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    1. Marshall, A. & Børresen, B. & Hagen, G. & Tsypkin, M. & Tunold, R., 2007. "Hydrogen production by advanced proton exchange membrane (PEM) water electrolysers—Reduced energy consumption by improved electrocatalysis," Energy, Elsevier, vol. 32(4), pages 431-436.
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    4. Yilmaz, Ceyhun & Kanoglu, Mehmet, 2014. "Thermodynamic evaluation of geothermal energy powered hydrogen production by PEM water electrolysis," Energy, Elsevier, vol. 69(C), pages 592-602.
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    Cited by:

    1. Abdin, Z. & Webb, C.J. & Gray, E.MacA., 2017. "Modelling and simulation of an alkaline electrolyser cell," Energy, Elsevier, vol. 138(C), pages 316-331.
    2. Sakr, I.M. & Abdelsalam, Ali M. & El-Askary, W.A., 2017. "Effect of electrodes separator-type on hydrogen production using solar energy," Energy, Elsevier, vol. 140(P1), pages 625-632.
    3. Ameur, Houari, 2015. "Energy efficiency of different impellers in stirred tank reactors," Energy, Elsevier, vol. 93(P2), pages 1980-1988.
    4. Mohamed-Amine Babay & Mustapha Adar & Ahmed Chebak & Mustapha Mabrouki, 2023. "Dynamics of Gas Generation in Porous Electrode Alkaline Electrolysis Cells: An Investigation and Optimization Using Machine Learning," Energies, MDPI, vol. 16(14), pages 1-21, July.

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