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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Effect of flow pulsation on fluidization degree of gas-solid fluidized beds by using coupled CFD-DEM
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Effect of flow pulsation on fluidization degree of gas-solid fluidized beds by using coupled CFD-DEM

机译：耦合CFD-DEM流动脉动对气固流化床流化程度的影响

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摘要

In this paper, the effect of inlet flow type on fluidization of a gas-solid fluidized bed was studied by using numerical simulations. Gas-solid fluidized beds are widely used in processes such as heating, cooling, drying, granulation, mixing, segregating and coating. To simulate the gas-particle flows, the unresolved surface CFD‐DEM was used considering Eulerian–Lagrangian approach. The fluid phase was modeled by computational fluid dynamics (CFD) while the solid phase was solved by discrete element method (DEM), and the coupling between gas and solid phases was considered to be four-way. The uniform and pulsed flows were injected through three nozzles located at the bottom of a rectangular bed. Three types of pulsed flow were considered: sinusoidal, rectangular and relocating. The fluidized bed behavior was discussed in terms of minimum fluidization velocity (MFV), pressure drop, bubble formation, bed expansion, particles velocity and, gas-solid interaction and particle contact forces. The results of different simulations indicated that the minimum fluidization velocity of the beds fluidized by pulsed flows was decreased by up to 33%. The influence of the pulsation amplitude on the minimum fluidization velocity was more significant than that of the pulsation frequency. The bed expansion and particles average velocity were increased by the pulsed flows, while the pressure drop and interaction force were decreased. As the pulsation frequency increased, the pressure drop and gas-solid interaction force increased, although size of the bubbles and bed expansion decreased. It was also observed that in large vibration frequencies, the bubbles became more regular. In the sinusoidal flow, the velocity and contact force between the particles were initially increased by frequency and in larger frequencies they were decreased.
机译：本文通过使用数值模拟研究了入口流动型对气固流化床流化的影响。气固流化床广泛用于加热，冷却，干燥，造粒，混合，隔离和涂层的方法中。为了模拟气体粒子流动，考虑到欧拉维亚拉格兰语方法使用未解决的表面CFD-DEM。通过计算流体动力学（CFD）模拟流体相，同时通过离散元素法（DEM）求解固相，气体与固体相之间的耦合被认为是四向。通过位于矩形床底部的三个喷嘴注入均匀和脉冲流。考虑了三种类型的脉冲流动：正弦，矩形和迁移。在最小流化速度（MFV），压降，气泡形成，床膨胀，颗粒速度和，气体固体相互作用和颗粒接触力方面讨论了流化床行为。不同仿真的结果表明，通过脉冲流量流化的床的最小流化速度降低了高达33％。脉动幅度对最小流化速度的影响比脉动频率的影响更大。脉冲流量增加了床膨胀和粒子平均速度，而压降和相互作用力降低。随着脉动频率的增加，压降和气体固体相互作用力增加，但是气泡和床膨胀的尺寸减小。还观察到，在大振动频率中，气泡变得更加规则。在正弦流动中，颗粒之间的速度和接触力最初通过频率增加并且在较大的频率下降。

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