In the present work, hydrodynamics of a fluidized bed with binary solid mixture have been studied using CFD simulations. Two different cases one with binary mixtures of 20% large and 80% small particles and other with 40% large particles 60% small particles respectively (both of Geldart B type) are chosen. Transient and steady state flow patterns have been reported for understanding the stability and increase in bed height for the chosen mixtures. Further, the velocity, turbulence parameters and solid volume fraction profiles have been analyzed to understand the characteristics like mixing and segregation in the beds