Modelagem multifasica Euleriana-Euleriana para simulação numerica de ciclones / Eulerian-Eulerian approach for numerical simulation of cyclones

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In this work it is presented the computational code CYCLO, which is a program developed specifically to predict the dynamic behavior of the gas-solid flow in cyclones. The cyclones have been used extensively in many industries for a long time for separating the particles from gaseous streams. Since the beginning of the industrialization until the present time, the cyclones are investigated scientifically in order to elucidate the real functioning of this complex flow behavior inside of these equipments. With the computational advance, the modern techniques of the computational fluid dynamics (CFD), has been capable to assist in the scientific inquiries concerning cyclones. The CYCLO code is one of these programs based on computational fluid dynamics (CFD) techniques. The program consists of a multiphase flow model based on the Eulerian-Eulerian approach and it is composed of several partial differential equations, which are solved using the finite volume method with pressure-velocity coupling and staggered grids. The axial symmetry hypothesis is assumed, which makes possible to apply the 3D symmetric model in cylindrical coordinate. The CYCLO code makes possible the use of up to three solid phases, each one represented by a particle diameter, density and specific volumetric fraction. The solid-phase flow is considered inviscid and drag forces between phases are responsible for the gas-solid interaction. To represent an anisotropic behavior of the Reynolds stress in the gas phase, it is used a hybrid model composed of the combination of the (k-e) standard model for the radial and axial components and Prandt?s longitudinal mixing model for the tangential components. The purpose of the present study is to verify and validate the model used by the CYCLO code and to show practical applications of the use of CFD techniques. In order to verify and validate the code, numerical results were compared with experimental data for gas and gas-solid flows. As practical examples of application of CFD techniques, the code was used to the analysis and design of industrial cyclones

ASSUNTO(S)

finite volume metodo dos volumes finitos fluidodinamica computacional ciclone escoamento multifasico multiphase flow cyclone eulerian model

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