Hydrodynamic characteristics of a two-dimensional jetting fluidized bed with binary mixtures

A cold model of a two-dimensional jetting fluidized bed with a cross sectio n 300 mm x 50 mm was employed to study the jet penetration depth and flow r egime transitions. Four types of particles and four kinds of binary mixture s were used as bed materials in the test. In addition, a new multi-channel pilot tube system was developed to investigate the penetration depth. Exper imental results indicate that the penetration depth decreases when the annu lar gas flow rate is increased from 1.0Q(mf) to 2.5Q(mf), while it remains constant for annular gas flow rate ranging from 2.5Q(mf) to 3.0Q(mf) (annul ar gas flow rate including fluidization air from the plenum chamber and the V type gas distributor). A new correlation is presented for predicting the penetration depth for different annular gas flow rate. The effects of part iculate density, particulate diameter, jet velocity, static bed height, noz zle diameter, and annular gas flow rate on flow regime transitions. i.e. je t, transition flow regime and spout, were systematically examined. A correl ation to predict flow regime transitions was also developed, which was in g ood agreement with the experimental data from the present study and other r eferences. (C) 2001 Elsevier Science Ltd. All rights reserved.