A comparative study on the influence of the gas flow rate on the hydrodynamics of a gas–solid spouted fluidized bed using Euler–Euler and Euler–Lagrange/DEM models

摘要: Abstract In this work, different modeling approaches are used to study the hydrodynamics of gas–solid flows in a three-dimensional, lab-scale spouted fluidized bed. particular, simulation results obtained by two-fluid model compared with those coupled CFD/DEM simulations. To explore effects gas mass flow rate on ability techniques predict behavior simulated test case, two fluidization conditions considered while maintaining same computational set-up. The bed has been evaluated means high-speed imaging for validating results. A comparative experimental observations bubble size terms representative diameter and height carried out under both operating conditions. identify significant settings model, parameter is out. investigated input parameters include gas–particle drag models, granular temperature approach, solid-phase wall boundary specularity coefficient particle–particle restitution coefficient. At 0.005 kg/s, predicted characteristics formation expansion using very good agreement observations. Using validated settings, shows some notable discrepancies when increased 0.006 kg/s, DEM more successful than reproducing realistic patterns. Although right regimes trends sizes expansion, their deviate significantly from data during final stage formation. most important reasons differences predicting dynamics along advantages limitations discussed.