Bubble dynamics in a two-dimensional gas-solid fluidized bed

Related referential studies on gas-solid two-phase flows were briefly reviewed. Bubble ascending in a two-dimensional (2D) gas-solid fluidizedbed was studied both experimentally and numerically. A modified continuum model expressed in the conservation form was used in numericalsimulation. Solid-phase pressure was modeled via local sound speed; gas-phase turbulence was described by the K-ε two-equation model. Themodified implicit multiphase formulation (IMF) scheme was used to solve the model equations in 2D Cartesian/cylindrical coordinates. The bubbleascending velocity and particle motion in the 2D fluidized bed were measured using the photochromic dye activation (PDA) technique, which wasbased on UV light activation of particles impregnated with the dye. Effects of bed height and superficial gas velocity on bubble formation andascent were investigated numerically. The numerically obtained bubble ascending velocities were compared with experimental measurements. Gasbubble in jetting gas-solids fluidized bed was also simulated numerically.