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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Discrete element method simulation of three-dimensional conical-base spouted beds
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Discrete element method simulation of three-dimensional conical-base spouted beds

机译：三维圆锥基喷动床的离散元方法模拟

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摘要

A discrete element method(DEM)simulation of three-dimensional conical-base spouted beds is presented.The overall height and diameter of the vessel are 0.5 and 0.15 m,respectively,and the nozzle diameter is 0.02 m.The inclined angle of the conical section varies from 0 to 60 degrees.The gas flow is described by the continuity and Navier-Stokes equations and solved by a finite difference method of second order accuracy in space and time.For gas-particle interaction,the Ergun equation(for void fraction smaller than 0.8)and the Wen-Yu model(for void fraction of 0.8 and above)are employed.A new method for treatment of the boundary condition for 3-D gas flow along the cone surface is proposed.This boundary condition satisfies both the continuity and momentum-balance requirements for the gas phase.Usefulness of the present simulation for studying gas flow pattern and particle motion in conical-base spouted beds is demonstrated.The effects of the inclined angle and draft tube on gas and particle flow in spouted beds are discussed.
机译：提出了三维圆锥基喷动床的离散元方法（DEM）仿真。容器的总高度和直径分别为0.5和0.15 m，喷嘴直径为0.02 m。截面从0到60度不等。气流由连续性和Navier-Stokes方程描述，并通过时空二阶精度的有限差分法求解。对于气体-颗粒相互作用，Ergun方程（空隙分数）小于0.8），并采用Wen-Yu模型（空隙率大于等于0.8），提出了一种处理沿锥面的3-D气体边界条件的新方法，该边界条件满足气相的连续性和动量平衡要求。演示了当前模拟在研究锥形基喷头床中的气体流动模式和颗粒运动方面的实用性。倾斜角和引流管对气体和颗粒的影响讨论了喷床中的流向。

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