Abstract: For the new technology of ladle bottom powder injection， the effect of rough slot wall on transfer behavior of particle-gas flow was studied. A new probability distribution function of roughness angle was proposed by analyzing the process of particle-rough wall collision， and a particle history effect model was established to consider wall roughness effect. Based on the Eulerian-Lagrangian approach， this model was utilized to stochastically model the transfer behavior of particulate flow in the slot plug. The effect of wall roughness on particle trajectories， velocity distributions and particle mass concentrations was considered， and the trajectories of particles near the slot wall have been predicted successfully. The results indicate that roughness wall causes particles to collide on the wall with a higher frequency， which leads to the decrease of particle kinetics and the increase of fluctuation velocity. Moreover， roughness wall also causes a more uniform distribution of particles in the bottom powder injection device.

Key words: ladle bottom powder injection, slot plug, rough wall, particle-gas flow, numerical simulation