Effect of pressure on transport velocity in gas fluidized-beds

Abstract

Abstract The effect of pressure (100–700\u202fkPa in absolute pressure) on the transport velocity in gas fluidized-beds was investigated with changing particle properties in diameter (0.067–0.637\u202fmm) and apparent density (1647–4175\u202fkg/m3) at atmospheric temperature. The emptying time method was used to determine the transport velocity. The transport velocity decreased as the pressure increased. The correlation of Kim et al. that incorporated the correlation of the particle entrainment rate with the absolute value of local slope as the criterion for locating the transport velocity in the relationship between dimensionless velocity (U/Ut) and the reciprocal of the entrainment rate (1/Ki*+) agreed best to measured transport velocities. The correlation of Perales et al. was useful in reasonable accuracy for estimation of transport velocity among the simple relationships between Retr and Ar.