| Journal: | Journal of the Brazilian Society of Mechanical Sciences |
| Database: | PERIÓDICA |
| System number: | 000312078 |
| ISSN: | 0100-7386 |
| Authors: | Alves, Jose Jailson Nicacio1 Martignoni, Waldir Pedro Mori, Milton2 |
| Institutions: | 1Universidade Federal da Paraiba, Departamento de Engenharia Quimica, Campina Grande, Paraiba. Brasil 2Universidade Estadual de Campinas, Departamento de Processos Quimicos, Campinas, Sao Paulo. Brasil |
| Year: | 2001 |
| Volumen: | 23 |
| Number: | 1 |
| Pages: | 91-104 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | The main objective of this work is to analyze the importance of the gas-solid interface transfer of the kinetic energy of the turbulent motion on the accuracy of prediction of the fluid dynamic of Circulating Fluidized Bed (CFB) reactors. CFB reactors are used in a variety of industrial applications related to combustion, incineration and catalytic cracking. In this work a two-dimensional fluid dynamic model for gas-particle flow has been used to compute the porosity, the pressure, and the velocity fields of both phases in 2-D axisymmetrical cylindrical co-ordinates. The fluid dynamic model is based on the two fluid model approach in which both phases are considered to be continuous and fully interpenetrating. CFB processes are essentially turbulent. The model of effective stress on each phase is that of a Newtonian fluid, where the effective gas viscosity was calculated from the standard k-epsilon turbulence model and the transport coefficients of the particulate phase were calculated from the kinetic theory of granular flow (KTGF). This work shows that the turbulence transfer between the phases is very important for a better representation of the fluid dynamics of CFB reactors, especially for systems with internal recirculation and high gradients of particle concentration. Two systems with different characteristics were analyzed. The results were compared with experimental data available in the literature. The results were obtained by using a computer code developed by the authors. The finite volume method with collocated grid, t |
| Disciplines: | Física y astronomía |
| Keyword: | Dinámica de fluidos, Modelos matemáticos, Reactores de cama fluidizada, Cinética, Simulación, Método de volumen finito, Turbulencia |
| Keyword: | Physics and astronomy, Fluid dynamics, Mathematical models, Fluidized bed reactor, Kinetics, Simulation, Finite volume method, Turbulence |
| Full text: | Texto completo (Ver HTML) |
