| Revista: | Journal of the Brazilian Society of Mechanical Sciences |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312082 |
| ISSN: | 0100-7386 |
| Autores: | Silva, Edson L1 |
| Instituciones: | 1Universidade Federal de Sao Carlos, Departamento de Engenharia Quimica, Sao Carlos, Sao Paulo. Brasil |
| Año: | 2001 |
| Volumen: | 23 |
| Número: | 4 |
| Paginación: | 503-512 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | This paper presents the experimental characterization of hydrodynamics and gas-liquid mass transfer in a three-phase fluidized bed containing polystyrene and nylon particles. The influence of gas and liquid velocities on phase holdups and volumetric gas-liquid mass transfer coefficient was investigated for flow conditions similar to those applied in biotechnological process. The phase holdups were obtained by the pressure profile technique. The volumetric gas-liquid mass transfer coefficient was obtained adjusting the experimental concentration profiles of dissolved oxygen in the liquid phase with the predictions of the axial dispersion model. According to experimental results the liquid holdup increases with the gas velocity, whereas the solid holdup decreases. The gas holdup increases significantly with the increase in gas velocity, and it shows for the three-phase fluidized bed comparable values or larger than those of bubble column. The volumetric gas-liquid mass transfer coefficient increases significantly with an increase in the air velocity for both bubble column and fluidized beds. In addition, in the operational condition of high liquid velocity, the presence of low-density particles in the bed increased the gas-liquid mass transfer, and thus the volumetric mass transfer coefficient values obtained in the fluidized bed were comparable or larger than those of bubble column |
| Disciplinas: | Física y astronomía, Ingeniería |
| Palabras clave: | Dinámica de fluidos, Ingeniería química, Hidrodinámica, Transferencia de masa, Columna de burbujeo, Lecho fluidizado |
| Keyword: | Physics and astronomy, Engineering, Fluid dynamics, Chemical engineering, Hydrodynamics, Mass transfer, Bubble column, Fluidized bed |
| Texto completo: | Texto completo (Ver HTML) |
