On a Eulerian and Lagrangian combined model in dense particle-laden riser flow

A new numerical model using both Eulerian and Lagrangian coordinates, and t aking account of interparticle interactions, has been developed for the stu dy of hydrodynamic aspects of dense particle-laden rise flows. A stochastic particle dispersion model has been incorporated in the original model to d escribe the gas particle turbulent flows. In addition, the collisional inte raction between the particles has been modeled using the kinetic theory of granular flows based on the Chapman-Enskog theory of dense gases. A compari son with the experimental results of Miller and Gidspow (1992) shows reason ably good agreement, The present model may provide a useful approach for pr edicting the complex hydrodynamic behaviour of fluidized bed systems.