A study on the behavior of bubbles and solids in bubbling fluidized beds

In present work, a novel bubble distribution model, based on the population balance of bubbles, is proposed incorporating with the Navier-Stokes equat ion for solid flow in order to predict the solid mixing and circulation as well as the bubble behavior in bubbling fluidized beds. This work is compri sed of three sections: The first section is "estimation of solid flow patte rn in bubbling fluidized bed". In this section. we compare the computed val ues of bubble diameter and solid velocities with experimental values in cyl indrical bubbling fluidized bed. The second section is "estimation of solid flow pattern in rectangular fluidized beds". This section is divided into two parts. In the first part, we apply the simulation model to bubbling rec tangular fluidized bed, which is expressed by the rectangular coordinate sy stem in place of the cylindrical coordinate. In the second part, we compute the solid behavior in beds equipped with immersed vertical tubes. Third se ction is "solid mixing in bubbling fluidized beds". This section is also di vided into two parts. In the first part, we investigate experimentally the solid mixing characteristic in bubbling fluidized beds using the tracer par ticle. In the second part, we incorporate the simulation model with a solid dispersion model for predicting the solid mixing in bubbling fluidized bed s. (C) 2000 Elsevier Science S.A. All rights reserved.