Coupling of plug flow model into Fluent simulations
Le résumé fourni par la source
This paper presents a semi-empirical plug-flow reaction model for the photodegradation of formaldehyde present in indoor air in a monolith photoreactor. This semi-empirical plug-flow model was adjusted according to published experimental data to determine the average value of the illuminated surface-to-volume ratio of the photocatalysts. These values were then imported into FLUENT, which is a commercial Computational Fluid Dynamics (CFD) software, by using a user-defined subroutine to account for the coupling between the local light intensities and the reaction kinetics. In FLUENT, the monoliths were treated as porous zones and photocatalytic oxidations taking place on the monolith surfaces were assumed to follow Langmuir-Hinshelwood kinetics. The Discrete Ordinates (DO) model was used to simulate the light intensity. The simulation results matched well with the published experimental data. This paper signifies that the presented novel method can be used for multiple-species reactions modelling. The simulations in FLUENT provide a thorough insight of the monolith photoreactor; on the other hand, the developed plug-flow model would be beneficial in the aspect of control design.
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