EFFECT OF RESTITUTION COEFFICIENT IN CFD SIMULATION OF SOLID-LIQUID TAPERED INVERSE FLUIDIZED-BED HYDRODYNAMICS
In the present work, an investigation made to develop a solid-liquid tapered inverse fluidized bed reactor (TIFBR).It essentially deals with the simulation of a TIFBR in computational fluid dynamics (CFD) using the software Ansys Fluent v17.In the present investigation, to analyze the effect of the elasticity of particle collision on the hydrodynamic characteristics of a TIBR patched with 895 kg/m3 particles.The simulation is conducted using the Eulerian multifluid model, which is combined with the solid particle kinetic theory. The coefficients of exchange are determined by applied the Gidaspow drag function.The numerical findings were confirmed with experimental data (bed height and Voidage) and demonstrated that the model is capable of predicting the hydrodynamics of TIFBR.To determine the impact of the elasticity of solids collision, various estimated values of the restitution coefficient (RC) (0.85 to 1.0) were used in the numerical and their results were observed in detail. Simulations were done
for two various solid-phase wall boundary (0.5&1.0) conditions. Bubble development was not found for perfectly elastic collision.The evolution of the bubble started when the restitution coefficient was set below 1.0, and the space occupied by the bubbles in the bed grown with a decrease in the restitution coefficient.