Numerical research on flow features of gas–solid flow of cylindrical particles
The flow features of gas–solid flow of cylindrical particles are essential. In the present work, a three-dimensional two-way coupling model was established for the gas–solid flow of cylindrical particles. Discrete Element Method (DEM), rigid dynamics and RNG κ– ε model were applied. Meanwhile, the force and motion model was established based on DEM and rigid dynamics, respectively. The two-way coupling correlation between cylindrical particles and turbulent flow was considered, which was established based on the correlation between Lagrangian time scales and κ – ε model. The interaction between cylindrical particles was taken into account using the rigid dynamics and the modified Nanbu method. The model was verified by a cold-state fluidization experiment of gas–solid flow of cylindrical particles in a riser. In addition, some rheological properties of gas–solid two-phase turbulent flow such as pressure distribution, velocity distribution and turbulent kinetics along the axis of the riser were investigated using the model.
Keywords: gas–solid flow, cylindrical particles, two-way coupling, interaction between cylindrical particles, rheological properties.