Study of gas and gas-solid flow in ciclones using computational fluid dynamics technics / "Estudo dos escoamentos gasoso e gas-solido em ciclones pela aplicação de tecnicas de fluidodinamica computacional"

AUTOR(ES)

Sergio Bernardo

DATA DE PUBLICAÇÃO

2005

RESUMO

This work is the result of the efforts of the CFD research group of the Chemical Processes Modeling and Simulation Laboratory located at FEQ-UNICAMP to study gas and gas-particle flow in a cyclone. The starting point was to consolidate previous information in cyclone flow using current CFD techniques. Two research lines were applied: the first one has studied gas flow and the second one was involved in the gas-solid flow study. These . analyses were focused on fluid dynamics parameters like tangential, axial and radial velocities profiles, pressure and coIlection efficiencies using a three-dimensional CFD model. Experimental and numerical results available in the literature were used to validate simulation data obtained in this work. Three-dimensional numerical grids were constructed using pre-processors like GAMBIT and ICEM CFD HEXA. The numerical simulations were performed using the commercial CFD codes FLUENT (v6.0) and CFX (v5.5.1, 5.6 and 5.7). These softwares make use of fmite volume method to solve transport equation system, using generalized coordinates. Turbulence models, like RSM, LES and DES were tested on simulations to extract important information about gas-solid flow profile. In addition, the influence of geometrical modifications on cyclone fluid dynamics was studied. The results showed that the methodology applied in this work is consistent to reproduce the fluid dynamic behavior of gas and gas-solid flow in a cyclone. Numerical results obtained here are in agreement with experimental results and other numerical data available in the literature. The modifications in the geometry proposed here indicate improvements in gas-solid coIlection efficiencies in the equipment. We believe that this study wiIl contribute to increase the knowledge on cyclone fluid dynamics

ASSUNTO(S)

ciclones cyclones simulação (computadores) computer simulation

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