BEHAVIOR OF HORIZONTAL OR INCLINED CONTINUOUS JETS GAS-INJECTED INTO A FLUIDIZED-BED .1. MORPHOLOGY OF THE JETS

Experiments have been carried out in a two-dimensional bed, in order to study the behaviour of horizontal or inclined jets in a gas-solids fluidized system. The use of cinematographic technique has enabled us to point out the interactions between the jet and the bubbles resulting from the fluidization, as well as the inherent fluctuations of the jet. The values of morphological parameters which characterize the jet are found from pictures and movies: penetration length and expansion angle, corresponding to three positions of the nozzle: inclined upwards, inclined downwards, or horizontal. The effect of the fluidization velocity, the gas injection velocity and the particles diameter is studied in these configurations. The existence of a dragging zone of particles from the dense phase into the jet, close to the injection point, is confirmed.