Numerical Simulation of Air and Particle Motions in 3-Dimensional Coarse Particle Turbulent Fluidized Bed.

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  • 粗大粒子からなる乱流流動層中の気流と粒子の運動の数値シミュレーション
  • ソダイ リュウシ カラ ナル ランリュウ リュウドウソウチュウ ノ キリュウ

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Abstract

To develop a better understanding of gas and particle motion in a turbulent fluidized bed we have numerically solved the locally averaged three dimensional Navier-Stokes equations and the Lagrangian equations of particle motions taking into account the collisions between particles and the mutual interactions between gas and particles. Finite difference methods were used. In this simulation locally averaged variables such as gas velocities were obtained by averaging point variables over a very small region which is one computational cell. Small stress terms caused by the fluctuations from the locally averaged values are considered in terms of the subgrid scale (S. G. S) model. To calculate collisions, particles were treated as hard spheres of which the collision time is zero, that is, a collision occurs between only two particles. The calculated results well describe large-scale unstable gas and particle flows induced in turbulent fluidized beds. Also the results are in fairly good agreement with the measured turbulent characteristics in a coarse particle turbulent fluidized bed in which the particle concentrations are relatively dilute. Therefore the simulation can be used to quantitatively predict the gas and particle motions in a coarse particle turbulent fluidized bed.

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