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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 >Gas-Solids Flow in Diffusers
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Gas-Solids Flow in Diffusers

机译：扩散器中的气固流动

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摘要

The calculation of the pressure rise within and downstream a gas-solids diffuser is still a problem. Unknown is the contribution of the particles to the pressure development. Therefore, the change in pressure and the deceleration of particles with different densities and sizes has been investigated. To predict the axial development of pressure reliably the radial particle velocity profile and the radial solids distribution have to be known. A three-dimensional model has been developed which allows the calculation of Lagrangian particle trajectories along a vertical pneumatic conveying pipe including a diffuser. In addition to the equilibrium of inertia, gravity and drag force the effects of particle rotation, momentum transfer between the phases, collision of particles with the pipe wall and interactions between particles are taken into account. The calculations are in fairly good agreement with measured data which were taken at different axial positions applying PDPA-technique. To extend the calculations to a wider range of influencing parameters (e.g. diffuser geometry) also the CFD-program Fluent has been applied to gas-solids flow in diffusers for comparison. In spite of its weakness to calculate accurate concentration profiles Fluent gives acceptable radial velocity profiles and very good predictions of the axial development of pressure.
机译：气固扩散器内部和下游的压力上升的计算仍然是一个问题。未知的是颗粒对压力发展的贡献。因此，研究了密度和尺寸不同的颗粒的压力变化和减速度。为了可靠地预测压力的轴向发展，必须知道径向粒子速度曲线和径向固体分布。已经开发了三维模型，该模型允许计算沿带有扩散器的垂直气动输送管的拉格朗日粒子轨迹。除了惯性，重力和阻力的平衡外，还考虑了粒子旋转，相之间的动量传递，粒子与管壁的碰撞以及粒子之间的相互作用等影响。计算结果与使用PDPA技术在不同轴向位置获取的测量数据非常吻合。为了将计算扩展到更大范围的影响参数（例如扩压器几何形状），CFD程序Fluent也已应用于扩压器中的气固流动以进行比较。尽管Fluent不能精确计算浓度分布，但Fluent仍可以提供可接受的径向速度分布以及对压力轴向发展的很好预测。

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