Numerical comparison of thermal energy performance between spouted, fluidized and fixed beds using supercritical CO2 as fluidizing agent

The different thermal energy performance between spouted, fluidized, and fixed beds when using supercritical CO2 as a fluidizing agent was numerically investigated by employing combined approach of Computational Fluid Dynamics (CFD) Coarse-Grained Particle (CGP) methods. model first validated against experimental data available in the literature, confirming that simulated particle velocity temperature agreed well with measurements. numerical results reveal for spouted bed, gas velocity, temperature, convective heat transfer were higher spout region. Hence, most transported directly from inlet to outlet this system. For fluidized particles near quickly heated up at first, uniform distribution achieved whole bed during later stages process. Concerning its behavior is well-known three zones differentiated, which are hot region, cold zone, intermediate thermocline. Besides, simulations allow further analysis detail mechanisms configurations tested. Convection dominant mechanism all cases. Conduction noticeable regime compared or regimes, but even case, it still an order magnitude lower than convection mechanism. Finally, exergy also analyzed beds.