May 26, 2013
Ray Cocco, Jennifer McMillan, Roy Hays, S.B. Reddy Karri, Fluidization XIV, The Netherlands
Many of our fluidized bed unit operations involve liquid injection. Yet, how the liquid and solids interact in these units and how the hydrodynamics change because of the liquid injection is not well understood. High-speed video imaging suggests that two types of particle clustering are prevalent when using a standard type of liquid atomizer in a fluidized bed. Smaller clusters tend to be formed near the nozzle region, whereas large agglomerates are formed further downstream from the nozzle. These large agglomerates appeared to form an almost impenetrable membrane that further stabilized the jet while allowing little distribution of the liquid into the fluidized bed.