Get access

Photon absorption in a hybrid slurry photocatalytic reactor: Assessment of differential approximations

Authors

  • Sayra L. Orozco,

    Corresponding author
    1. Departamento de Sistemas Energéticos, Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, México
    • Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, México
    Search for more papers by this author
  • Heidi I. Villafán-Vidales,

    1. Departamento de Sistemas Energéticos, Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, México
    Search for more papers by this author
  • Camilo A. Arancibia-Bulnes

    1. Departamento de Sistemas Energéticos, Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Temixco, Morelos 62580, México
    Search for more papers by this author

  • C. A. Arancibia-Bulnes: On sabbatical leave at Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora.

Abstract

Radiative transfer inside a slurry photocatalytic reactor with hybrid illumination from both solar radiation and lamps is examined. The local volumetric rate of photon absorption is evaluated. For this purpose, the P1 and the modified differential approximations (MDAs) are used, and results compared to a solution by the Monte Carlo method. It is found that significant differences may arise between the predictions of the above approximations and the exact results provided by the Monte Carlo simulations. The P1 approximation is very inaccurate near to the radiation entrance for the partially collimated solar radiation, although it improves, as optical depth increases. As expected, the MDA improves the results near to the boundary. Surprisingly, it turns out to be much worse than the P1 approximation at medium and large optical depths. In the case of lamp irradiation, the behavior of the MDA is the opposite; it works better at small optical depths. © 2011 American Institute of Chemical Engineers AIChE J, 58: 3256–3265, 2012

Get access to the full text of this article

Ancillary