Study on the Shape and Flow Characteristics of the Formed Bubbles in a Pressurized Fluidized Bed : For the Case of Formed Bubble from Single Nozzle

It is most important factors that were dealt with the size and production frequency of formed bubble and the rising state of bubble in the distributor vicinity at a solid-gas fluidized bed for the mixing and reacting process of the fluidized bed. Especially it is more complicated in the case of the pressurized fluidized bed. In order to understand the mechanism and behavior of the formed bubble, the investigations on the shape and flow characteristics of the formed bubble in a pressurized bed was carried out and bubbles were formed at a single nozzle in the pressurized solid-gas fluidized bed with distributor. Experimental data were obtained from visualized image of the bubble using the shadow-graph method and were analyzed. Those results indicate that the size and rising velocity of bubble were increased with relation to increase of the nozzle flow rate and these bubble behavior were varied with increase of the pressure in bed.