Characteristics of flow in wet conical spouted beds of unequal-sized spherical Particles

AUTOR(ES)

Bacelos, M. S., Passos, M. L., Freire, J. T.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2008-03

RESUMO

Interparticle forces, developed in wet spouted beds composed of a mixture of spherical particles with different size distributions, intensify particle segregation mechanisms interfering in gas distribution inside the bed and, consequently, in the spouting flow characteristics. Therefore, this paper is aimed at describing the effect of interparticle forces on the air-solid flow distribution in conical spouted beds of unequal-sized particles coated by a thin glycerol film. Experimental results show that both the minimum spouting airflow rate and the minimum spouting pressure drop decrease as the amount of glycerol added to the bed increases. In addition, simulated results of the annular air velocity along the bed height showed that, at the base of the column, the radial component of the inertial force is high enough to break liquid bridges between particles and carry these particles out along the spout. Moreover, as the glycerol concentration increases, the spout diameter increases along the bed height. Such changes in the air-solid flow can maintain the spouting regime for higher glycerol concentrations as shown by experimental data.

Documentos Relacionados

• A study of the pneumatic conveying of non-spherical particles in a turbulent horizontal channel flow
• Discrete element modeling of non-spherical particles using a spherical shape
• Investigation of hydrodynamics and heat transfer in pseudo 2D spouted beds with and without draft plates
• Drying and extraction of astaxanthin from pink shrimp waste (Farfantepenaeus subtilis ): the applicability of spouted beds
• Genome-sized RNA from reovirus particles.