Análise numérica de um leito poroso aplicado em um sistema de refrigeração por adsorção

Abstract

This dissertation aims to observe the behavior of the adsorption dynamics applied to an adsorption bed that works with the pair activated carbon and ethanol, by the computational fluid dynamics simulation with the help of Ansys CFX software. The simulations were prepared in LABRADS / CEAR / UFPB, using Ansys Workbench software, in which the geometries were drawn in the Design Modeler component and the mesh was created in the Meshing. Then, all boundary conditions were entered in the CFX according to the reference used for validation. Then, all boundary conditions were inserted in the CFX-Pre software according to the reference used for verification. Once this stage was completed, sources terms were added to be considered in the continuity and conservation equations. These terms were constructed using expressions that considered functions generated from points extracted from curves representative of the adsorption rate for the studied domains. Another point that deserves to be highlighted in this study is that three different geometries (Domains I, II and II) with variations in height and width, maintaining the same volume, and for the three cases, the same contour conditions were applied. As results, pressure drops were found for domains I, II and III, demonstrating that for the higher and narrow domains observes a bigger pressure gradient, as is verified in the reference. Regarding the temperature gradients relative to the same domains, a bigger temperature variation was found, for the wider and lower domains. The representative contours of the pressure gradient and the thermal diffusion through the adsorbent particles, that were obtained for the different domains, presented to compatible approximation in results and in behaviors with the respective data used for verification.