CFD-DEM-IBM simulation on force characteristic on inclined-surface baffles in fluidized beds
Installing internal components in the dense-phase bed can significantly improve the fluidization quality of the industrial fluidized bed,enhance gas-solid mass transfer and improve chemical reaction efficiency.Due to the instantaneous impulse and long-term erosion of gases and particles,the internal components may deform or fracture.Therefore,it is necessary to comprehend their mechanical characteristics to optimize the design and implementation of the internal components of the fluidized bed.This article presents coarse-grained CFD-DEM-IBM simulation on the forces exerted on an inclined baffle using Cartesian grids.Furthermore,it extends the current stress statistical methodology to analyze the stress on baffles with varying tilt angles.The simulation results are compared to the experimental results,revealing that the simulated force curve of the baffle matches well in both trend and numerical values.Specifically,the particle force dominates the combined force acting on the baffle at the start-up stage,but during the normal fluidization stage,except for the maximum particle force,the gas phase pressure difference acting on the baffle is greater than the particle force for most of the time.As the tilt angle of the baffle decrease,the force acting on the baffle increases and the ability to inhibit the back-mixing enhances,so it is recommended to select a mechanically stronger baffle with the small inclination angle.
万方数据
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