G0500-1-3 一様な流れ場の中におかれた球形粒子クラスタの3次元数値解析([G0500-1]流体工学部門一般講演(1))

概要

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When powder with the inhomogeneous void ratio moves in a gas-solid flow, the cluster which has particle-particle influence is formed by fluid dynamic effect and collision effect If the void ratio of the cluster becomes high and particle-particle influence disappears, particles behave as a single particle sedimentation. Then, it is not sure whether there is the critical void ratio that the clustering effect disappears. In this study, we assumed the spherical particle cluster which stood still in the air, and performed simulation to give this a current of air. The gravity is not considered. The sedimentation velocity of a single particle in still air calculated by one-dimensional theory was given in all boundary condition. Direct Numerical Simulation and Hard Sphere Model was used for the flow calculation and particle-particle collision computation respectively. The particle and the fluid assumed glass beads of 60 μm and air of 20℃ respectively. The cluster diameter is 5mm, and Re based on the cluster diameter and the maximum value of the boundary velocity is 81.6. It was found that the particle volume density and the kinetic energy of the whole cluster were in inverse proportion
2010-09-04