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Modelamiento y simulación de reactores fotocatalíticos de película descendente: uso de la dinámica computacional de fluidos (CFD) para análisis del sistema multifásico
Modeling and simulation of falling film photocatalytic reactors: use of computational fluid dynamics (CFD) for multiphase system analysis
Modelagem e simulação de reatores fotocatalíticos de filme descendente: uso da dinâmica de fluidos computacional (CFD) para análise de sistemas multifásicos
DOI:
https://doi.org/10.15446/rev.colomb.quim.v52n2.110351Keywords:
fotocatálisis, CFD, reactor de película descendente, sistema multifase (es)photocatalysis, CFD, falling film reactor, multiphase system (en)
fotocatálise, CFD, reator de filme descendente, sistema multifásico (pt)
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La dinámica computacional de fluidos (CFD) se perfila como una herramienta apropiada para el modelamiento de procesos fotocatalíticos heterogéneos, pues permite considerar simultáneamente los diferentes fenómenos físicos trascendentales de los procesos. En el presente estudio se empleó el software COMSOL Multiphysics para modelar el régimen de flujo y determinar la distribución de las partículas de catalizador en un reactor fotocatalítico de película descendente, hecho relevante para determinar la eficiencia del reactor. Las simulaciones del reactor fueron realizadas con el módulo de Mezclas de COMSOL, en un régimen de flujo turbulento empleando el enfoque de RANS. Se detectaron siete zonas definidas con un perfil particular de concentración de catalizador en toda el área de la película, para las cuales se estimó la absorción fotónica en el reactor con el modelo de seis flujos (SFM). De ello se obtuvo que existe una diferencia de más del 20% entre el mayor y el menor valor del promedio de la absorción fotónica en el área reactiva, con lo que se puede esperar que la variación en la degradación de los contaminantes en estas zonas oscile entre el 10 y el 20%, lo cual debe tenerse en cuenta para la aplicabilidad de la tecnología.
Computational fluid dynamics (CFD) is emerging as an appropriate tool for modeling heterogeneous photocatalytic processes, since it allows simultaneous consideration of the different physical phenomena involved in the processes. In the present study, COMSOL Multiphysics software was used to model the flow regime and to determine the distribution of catalyst particles in a falling film photocatalytic reactor, which is relevant to determine the reactor efficiency. The reactor simulations were performed with the COMSOL Mixture module in a turbulent flow regime using the RANS approach. Seven defined zones were detected having a particular catalyst-concentration profile over the entire film area, for which the photonic absorption in the reactor was estimated with the six-flux model (SFM). From this it was obtained that there is a difference of more than 20% between the highest and the lowest value of the average photonic absorption in the reactive area, so it can be expected that the variation in the degradation of pollutants in these zones ranges between 10 and 20%, which should be taken into account for the applicability of the technology.
A Dinâmica de Fluidos Computacional (CFD) surgiu como uma ferramenta adequada para modelar processos fotocatalíticos heterogêneos, pois permite que os diferentes fenômenos físicos dos processos sejam considerados simultaneamente. No presente estudo, o software COMSOL Multiphysics foi usado para modelar o regime de fluxo e determinar a distribuição de partículas de catalisador em um reator fotocatalítico de filme descendente, o que é relevante para determinar a eficiência do reator. As simulações do reator foram realizadas com o módulo COMSOL Mixtures, em um regime de fluxo turbulento usando a abordagem RANS. Sete zonas definidas com um perfil específico de concentração de catalisador foram detectadas em toda a área do filme, para as quais a absorção fotônica no reator foi estimada com o modelo de seis fluxos (SFM). A partir disso, verificou-se que há uma diferença de mais de 20% entre o valor mais alto e o mais baixo da absorção fotônica média na área reativa, de modo que a variação na degradação de poluentes nessas zonas pode variar entre 10 e 20%, o que deve ser levado em conta para a aplicabilidade da tecnologia.
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Copyright (c) 2024 Deyler Rafael Castilla Caballero, Astrid del Rosario Medina Guerrero, Fiderman Machuca Martínez, José Ángel Colina Márquez
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