Estudo da fluidodinâmica de um leito fluidizado empregando o modelo de fase discreta densa.

Abstract

Fluidized beds are widely used in many operations in the chemical, agricultural, biochemical, power generation and especially petrochemical industries. Full understanding of the movement of solids in a fluidized bed remains quite complex, and depends on parameters such as bed geometry and particle properties. The first mathematical models that describe the fluid dynamics of the fluidized bed considered a one-dimensional flow and constant parameters. With the advent of faster and more efficient computers have enabled the use of mathematical models based on the complete equations of conservation of mass, linear momentum, heat and matter applying Computational Fluid Dynamics (CFD). In this sense, the purpose of this paper is to evaluate the fluid dynamics of fluidized bed applying Eulerian-Lagrangean approach considering the Dense Discrete Phase Model (DDPM) in combination with the Discrete Element Method (DEM), this is responsible for modeling the collisions of a given discrete phase. Ansys Fluent commercial application was used to obtain the results of numerical simulations. The base case for comparison and verification is presented by Azhar e Stopford (2012), which was also simulated via the Ansys Fluent DDPM-DEM coupling. The results obtained with the simulations were finally validated with the experimental data found in Taghipuor et al. (2005).