Simulation the hydrodynamic behavior of binary solid-liquid fluidized beds

Solid-liquid fluidized beds containing binary mixture of spherical particles of different size and density has been studied. a combine of eulerian-langrangian model is used for predicting the hydrodynamics flow behavior of binary solid-liquid fluidized beds for a range of liquid velocities. the combining takes into account the effect of forces between particle-particle,and particle-liquid. the interaction between the liquid and each particle is performed through a drag force. in this study,three cases (pure species a,pure species b and mixture of pure species a & b) for a range of liquid (water) of fluidization have been investigated in the simulations. the simulations results demonstrate a good stability during the simulation time. the hydrodynamic behaviors for fluidized beds like the bed voidage (porosity),mean particle reynolds number and bed height are presented as a function of simulation time. the binary solid consider the smaller (denser) component as species a and the bigger (less dense) component as species b,in terms of the bed expansion height and porosity of the fluidized beds at a range of liquid velocities. the analysis of the hydrodynamics in the bed allows to understands the govern mechanisms of mixing and segregation for binary solid system. the comparisons results of each species (a,b) alone with the mixture of species revealed that; the hydrodynamic behavior (bed height,bed voidage and mean particle reynolds number) of the mixture is less than for species a and species b each one alone,this illustrates and explains the tendency of the mixture to segregate,especially with the increase of the inlet liquid velocity. thus,the results of combining model prove the effectiveness of the model to predictions the actual system behavior. © 2017,university of mohammed premier,oujda morocco.