The Effect of Shape on the Mixing and Segregation of Large Particles in a Gas-Fluidised Bed of Small Ones
The Effect of Shape on the Mixing and Segregation of Large Particles in a Gas-Fluidised Bed of Small Ones
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DOI：
10.1007/978-1-4684-1045-7_37
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
A. Nienow;D. Cheesman
中科院分区：
文献类型：
--
作者：
A. Nienow;D. Cheesman
通过 X 射线研究了体积当量直径达 15 毫米的球形和扁平颗粒在氧化铝床中的混合和偏析。目视观察使人们能够更充分地理解该机制，并且对 40 张照片（2.5 秒和 40 分钟期间）的分析使“瞬时”和“时间平均”分离模式得以确定。形状的影响相对较小，但从密度考虑，大的扁平颗粒本质上是废料。在低过量气体速度下，这些颗粒保留在分配器上或附近。将当前的“时间平均”分离模式与之前通过床切片获得的分离模式进行比较，表明两种技术之间具有良好的一致性。
The mixing and segregation of spherical and flat-shaped particles of up to 15 mm volume equivalent diameter in beds of alumina have been studied by X-rays. Visual observations enabled the mechanism to be more fully understood and the analysis of 40 photographs (from 2.5 s and from 40 min. periods) enabled “instantaneous” and “time-average” segregation patterns to be determined. The effect of shape was shown to be relatively minor except where the large flat particles are, from density considerations, inherently flotsam. At low excess gas velocities, these particles remain on or near the distributor. A comparison of the present “time-averaged” segregation patterns and ones obtained previously by bed-sectioning showed good agreement between the two techniques.