Effects of double orifice spacing on bubble behaviors and hydrodynamics in gas-liquid-solid systems through VOF-DEM method

The volume of fluid and discrete element model (VOF-DEM) method is employed to calculate the formation and rising of double bubbles generated through two different orifices in a gas-liquid-solid flow system. The deviation and coalescence of bubble queues which occur during the bubble rising process are discussed and analyzed with velocity vector diagrams. By comparing when particles are laid at the bottom or settling, it is found that free settlement of particles can weaken the deviation of the bubble queues. Moreover, finding a suitable distance between two orifices for enhanced particle entrainment under different air in-taking velocities is also studied.