Particle Movement Research In Rotational Spouted Gas-particle Flow Field

The main content is focused on the numerical simulation and experimental research of the gas flow field and the particle movement behavior in the rotational spout-fluidized bed. The bed is aΦ600/Φ250mm cone. The bed height is 1100mm. The rotational gas distribution board was used. The diameter of the tracing particles is between 3mm and 6mm. The wall material is polymethyl methacrylate. The particle movement trajectory was measured by the high-speed camera combined a mirror method.The research was done with the help of the Fluent software. A geometric model coordinate with the actual flow field structure and the appropriate meshing strategy was set up. The standardκ-εturbulence model was used to simulate the gas flow field in the rotational spout-fluidized bed. The calculation process kept steady. The results converged well and were coordinate with the experimental values. For the particle movement simulation, it was based on the Discrete Phase Model and used the C++ program to write source codes. Then, a particle-wall collision model which was based on linear theory and considered the mechanism change between friction and elastic force was developed. The Clift drag force model was also applied. The different particle movement conditions were successfully simulated. The simulational and experimental values were consistent.Through the numerical simulation and experimental research, the basical movement characteristics of the tracing particles were achieved: they rotate and fluctuate with the similar trajectory near the steady condition, and their velocity distributions are also similar. Besides, although elastic modulus and density vary in a large range, the particles'steady heights are all between 0.3m and 0.5m. The reason was analyzed from the aspect of numerical simulation.The physical property of particles has the different effets on the particle movement. The particle which has smaller density tends to be at the higher position when its situation becomes steady; the particle which has smaller diameter tends to fluctuate less in axial direction, and its reflection in radial direction becomes stronger; in elastic condition, elastic modulus has no obvious effect on the movement of particle; The particle which has worse sphericity fluctuates more largely in axial...