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首页> 外文会议>6th International Conference on Bulk Materials Storage, Handling and Transportation, Sep 28-30, 1998, University of Wollongong NSW >Discrete Particle Simulation of Plug Conveying in a Vertical Pipe
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Discrete Particle Simulation of Plug Conveying in a Vertical Pipe

机译：垂直管道中塞子输送的离散粒子模拟

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摘要

This paper describes a numerical simulation of the plug conveying in a vertical pipe. Trajectories of individual particles are solved by modeling the contact forces with the discrete element method(DEM). The motion of the fluid is calculated by solving the locally averaged equations taking account of the interaction between the fluid and the particles. The axisymmetry is assumed in the calculation of the fluid phase. The typical behavior of vertical plugs is obtained, that is, particles rain down from the back of a plug and are collected by the front of the plug below. The calculated pressure drop between two vertical positions is twice larger than that due to the weight of the particles as observed in the experiment by Konrad and Totah. It is confirmed that the shear stress acting on the pipe wall increases significantly when the falling particles hit the front of the plug.
机译：本文描述了垂直管道中塞子输送的数值模拟。通过使用离散元方法（DEM）对接触力进行建模，可以解决单个粒子的轨迹。通过考虑流体和颗粒之间的相互作用，通过求解局部平均方程来计算流体的运动。在流体相的计算中假设轴对称。获得了垂直塞子的典型行为，即，颗粒从塞子的后部落下，并被下面塞子的前部收集。由Konrad和Totah在实验中观察到，由于颗粒的重量，在两个垂直位置之间计算出的压降要大两倍。可以确定的是，当掉落的颗粒撞击塞子的前端时，作用在管壁上的剪应力显着增加。

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