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

  • Datos identificativos

    Identificador: imarina:5131262
    Autores:
    Torras, CarlesLorente, EstherHernandez, SimelysRusso, NunzioSalvado, Joan
    Resumen:
    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).
  • Otros:

    Autor según el artículo: Torras, Carles; Lorente, Esther; Hernandez, Simelys; Russo, Nunzio; Salvado, Joan
    Departamento: Enginyeria Química
    e-ISSN: 2311-5521
    Autor/es de la URV: Salvadó Rovira, Joan / Torras Font, Carles
    Palabras clave: Water splitting Producció d'hidrogen Photo-catalytic cell Hydrodynamics Fotosíntesi artificial Cfd - computational fluid dynamics Cfd Bubble characterization Artificial photosynthesis
    Resumen: 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).
    Áreas temáticas: Physics, fluids & plasmas Mechanical engineering Fluid flow and transfer processes Condensed matter physics Ciencias sociales
    Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 23115521
    Direcció de correo del autor: carles.torras@urv.cat joan.salvado@urv.cat
    Identificador del autor: 0000-0002-3112-3519 0000-0003-2238-6082
    Fecha de alta del registro: 2024-09-07
    Volumen de revista: 2
    Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
    Enlace a la fuente original: https://www.mdpi.com/2311-5521/2/2/25
    URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referencia al articulo segun fuente origial: Fluids. 2 (2):
    Referencia de l'ítem segons les normes 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
    DOI del artículo: 10.3390/fluids2020025
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2017
    Tipo de publicación: Journal Publications
  • Palabras clave:

    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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