Liquid dispersion in three-phase fluidized beds.

Abstract

Nguyen-tien et al.9) have reported on oxygen transfer measurements in TPFBusing water and air as liquid and gas phase, respectively. A reactor of0.14m diameter by 2.65 m height was employed. As fluidized particles, glass spheres were used the diameter of which ranged from 0.05 to 8 mm. used a well-established method1>2) to reliably determine volumetric mass transfer coefficients by measuring the oxygen steady-state axial concentration profiles along the reactor. Evaluation of such profiles was madeby using models which account for axial mixing such as, for instance, the axial dispersion model and the equivalent but more flexible back flow cell model. Hence, matching model predictions to the experimental profiles by applying Marquardt's optimization procedure yields both the volumetric mass

Liquid dispersion in three-phase fluidized beds.

“…In the recent publication of Nguyen-Tien et al 5) in this journal, a coefficient in the correlation of Kim and Kim3) for predicting the modified Peclet number in three-phase fluidized beds was modified from 20. 19 to 61.0 for the particle size range of0.3-1.0mm on the basis of bubble coalescing regime.1>2) However, a distinction has to be madebetween the three-phase fluidized bed and the three-phase slurry fluidized bed.…”