Articles producció científica> Enginyeria Química

Hydrodynamics and Oxygen Bubble Characterization of Catalytic Cells Used in Artificial Photosynthesis by Means of CFD

  • Identification data

    Identifier: imarina:5131262
    Authors:
    Torras, CarlesLorente, EstherHernandez, SimelysRusso, NunzioSalvado, Joan
    Abstract:
    Miniaturized cells can be used in photo-electrochemistry to perform water splitting. The geometry, process variables and removal of oxygen bubbles in these cells need to be optimized. Bubbles tend to remain attached to the catalytic surface, thus blocking the reaction, and they therefore need to be dragged out of the cell. Computational Fluid Dynamics simulations have been carried out to assess the design of miniaturized cells and their results have been compared with experimental results. It has been found that low liquid inlet velocities (~0.1 m/s) favor the homogeneous distribution of the flow. Moderate velocities (0.5-1 m/s) favor preferred paths. High velocities (~2 m/s) lead to turbulent behavior of the flow, but avoid bubble coalescence and help to drag the bubbles. Gravity has a limited effect at this velocity. Finally, channeled cells have also been analyzed and they allow a good flow distribution, but part of the catalytic area could be lost. The here presented results can be used as guidelines for the optimum design of photocatalytic cells for the water splitting reaction for the production of solar fuels, such as H2 or other CO2 reduction products (i.e., CO, CH4, among others).
  • Others:

    Author, as appears in the article.: Torras, Carles; Lorente, Esther; Hernandez, Simelys; Russo, Nunzio; Salvado, Joan
    Department: Enginyeria Química
    e-ISSN: 2311-5521
    URV's Author/s: Salvadó Rovira, Joan / Torras Font, Carles
    Keywords: Water splitting Producció d'hidrogen Photo-catalytic cell Hydrodynamics Fotosíntesi artificial Cfd - computational fluid dynamics Cfd Bubble characterization Artificial photosynthesis
    Abstract: Miniaturized cells can be used in photo-electrochemistry to perform water splitting. The geometry, process variables and removal of oxygen bubbles in these cells need to be optimized. Bubbles tend to remain attached to the catalytic surface, thus blocking the reaction, and they therefore need to be dragged out of the cell. Computational Fluid Dynamics simulations have been carried out to assess the design of miniaturized cells and their results have been compared with experimental results. It has been found that low liquid inlet velocities (~0.1 m/s) favor the homogeneous distribution of the flow. Moderate velocities (0.5-1 m/s) favor preferred paths. High velocities (~2 m/s) lead to turbulent behavior of the flow, but avoid bubble coalescence and help to drag the bubbles. Gravity has a limited effect at this velocity. Finally, channeled cells have also been analyzed and they allow a good flow distribution, but part of the catalytic area could be lost. The here presented results can be used as guidelines for the optimum design of photocatalytic cells for the water splitting reaction for the production of solar fuels, such as H2 or other CO2 reduction products (i.e., CO, CH4, among others).
    Thematic Areas: Physics, fluids & plasmas Mechanical engineering Fluid flow and transfer processes Condensed matter physics Ciencias sociales
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 23115521
    Author's mail: carles.torras@urv.cat joan.salvado@urv.cat
    Author identifier: 0000-0002-3112-3519 0000-0003-2238-6082
    Record's date: 2024-09-07
    Journal volume: 2
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://www.mdpi.com/2311-5521/2/2/25
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Fluids. 2 (2):
    APA: Torras, Carles; Lorente, Esther; Hernandez, Simelys; Russo, Nunzio; Salvado, Joan (2017). Hydrodynamics and Oxygen Bubble Characterization of Catalytic Cells Used in Artificial Photosynthesis by Means of CFD. Fluids, 2(2), -. DOI: 10.3390/fluids2020025
    Article's DOI: 10.3390/fluids2020025
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    Publication Type: Journal Publications
  • Keywords:

    Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanical Engineering,Mechanics,Physics, Fluids & Plasmas
    Water splitting
    Producció d'hidrogen
    Photo-catalytic cell
    Hydrodynamics
    Fotosíntesi artificial
    Cfd - computational fluid dynamics
    Cfd
    Bubble characterization
    Artificial photosynthesis
    Physics, fluids & plasmas
    Mechanical engineering
    Fluid flow and transfer processes
    Condensed matter physics
    Ciencias sociales
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