Simulação computacional do efeito da turbulência na hidrodinâmica de misturadores estáticos Kenics® aplicados à fotocatálise
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Data
2024/11/13
Autores
Schneider, Bruno de Oliveira
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Universidade Federal do Espírito Santo
Resumo
The treatment of industrial effluents can be considered an essential factor for sustainable development. Among the advanced oxidative processes (AOPs) applied, heterogeneous photocatalysis stands out due to the possibility of using solar energy and because it occurs at ambient pressure and temperature. Its large-scale application depends on improving the performance of photocatalytic reactors, with the compound parabolic collector reactor being one of the most promising. In this context, the use of static mixers has emerged as an alternative to improve mixing parameters and increase the rate of pollutant degradation. Although there are studies evaluating the main commercial mixers or geometries developed by the author, there is a lack of analysis of the hydrodynamic effect of using mixers in heterogeneous photocatalysis processes. The aim of this work was to numerically evaluate the effect of static mixers on the hydrodynamics of the photocatalytic process in a compound parabolic trough reactor. To do this, the flow inside the reactor was numerically simulated using Ansys Fluent® software for Reynolds numbers of 4,500 and 30,000. The contour plots and current lines of the normalized axial velocity along the tube and in different sections of the mixer were analyzed. The pressure drop resulting from the use of mixers was also evaluated. The results showed that the static mixer promoted the formation of vortices in different regions of the tube, an increase in the velocity gradient and turbulence in the flow. In addition, the geometry of the mixer favored the direction of the fluid towards the edge of the tube, a region that is most affected by radiation. These phenomena contribute to a better dispersion of the catalyst and the effluent in this region, which favors the heterogeneous photocatalytic reaction. Increasing the Reynolds number from 4500 to 30000 contributed to the formation of well-defined vortices, a reduction of the vortices, a reduction in backflow and an increase in higher velocity zones. Therefore, there was a positive effect on the hydrodynamic performance of the reactor
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Fotocatálise heterogênea , Misturador estático , Dinâmica dos fluidos computacional , Coletor parabólico composto , Efluente , Heterogeneous photocatalysis , Static mixer , Computational fluid dynamics , Compound parabolic collector. , Effluent