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Title: Coupling the six flux absorption-scattering model to the Henyey-Greenstein scattering phase function: Evaluation and optimization of radiation absorption in solar heterogeneous photoreactors
Authors: Acosta-Herazo, Raul
Monterroza-Romero, Jesus
Angel Mueses, Miguel
Machuca-Martinez, Fiderman
Li Puma, Gianluca
Keywords: TiO2-photocatalysis
Titanium dioxide
Local volumetric rate of photon absorption
Monte Carlo simulation
Radiative transfer equation
Issue Date: 2016
Publisher: © Elsevier
Citation: ACOSTA-HERAZO, R. ...et al., 2016. Coupling the six flux absorption-scattering model to the Henyey-Greenstein scattering phase function: Evaluation and optimization of radiation absorption in solar heterogeneous photoreactors. Chemical Engineering Journal, 302, pp. 86-96.
Abstract: © 2016 Elsevier B.V.Robust and practical models describing the radiation field in heterogeneous photocatalytic systems, used in emerging environmental, photochemical and renewable energy applications, are fundamental for the further development of these technologies. The six-flux radiation absorption-scattering model (SFM) has shown to be particularly suitable for the modeling of the radiation field in solar pilot-plant photoreactors. In this study, the SFM was coupled to the Henyey-Greenstein (HG) scattering phase function in order to assemble the model with a more accurate description of the scattering phenomenon provided by this phase function. This new version of SFM, named as SFM-HG, was developed through fitting the Local Volumetric Rate of Photon Absorption (LVRPA) determined in a flat photoreactor to the "pseudo-experimental" LVRPA calculated by a Monte Carlo (MC) approach, which included the HG expression. As a result, simple mathematical correlations describing the SFM-HG scattering probabilities as function of the HG scattering parameter were determined. The SFM-HG was validated through a comparison with the MC model predictions of the Total Rate of Photon Absorption (TRPA) in the slab photoreactor. A RMSE% of approximately 5% demonstrated satisfactory agreement between the models. The SFM-HG was further applied to evaluate the impact of selected scattering phase functions on the absorption of radiation in solar photoreactors, operated with commercial TiO2 photocatalyst. The results have established that, the apparent optical thickness, τapp (or τapp,max for tubes) a parameter derived from the SFM approach, is the most appropriate for the design and optimization of photocatalytic reactors. This parameter is insensitive to scattering albedos and phase functions. CPC, tubular and flat-plate photoreactors should be designed with τapp,max = 12, τapp,max = 7 and τapp = 4.5 respectively.
Description: This paper is in closed access until 27th April 2017.
Version: Accepted for publication
DOI: 10.1016/j.cej.2016.04.127
URI: https://dspace.lboro.ac.uk/2134/22281
Publisher Link: http://dx.doi.org/10.1016/j.cej.2016.04.127
ISSN: 1385-8947
Appears in Collections:Closed Access (Chemical Engineering)

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