流動層における粗大粒子の挙動と抗力係数

概要

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Flow visualization of the behavior of a large particle in a fluidized bed was conducted using neutron radiography. The large particle moved according to the bed materials, especially in the wake of a bubble. When the density of the large particle was high, the particle moved with a velocity different from that of bubble, and in some cases the particle moved downward through a bubble. When the density was low enough, the particle moved on the surface of the bubble wake. The drag force of the large particle immersed in the fluidized bed was measured. The drag force increased with increase in the volumetric gas flux as well as with increase in the particle diameter. The drag coefficient was derived and was well correlated on the basis of a two-phase model and experimentally determined effective viscosity of the bed materials.
社団法人日本機械学会の論文
1996-09-25