Particle mixing in rotating fluidized beds: Inferences about the fluidized state
Particle mixing in rotating fluidized beds: Inferences about the fluidized state
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旋转流化床中的颗粒混合：关于流化状态的推断
DOI：
10.1002/aic.690450705
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
J. Stevens
中科院分区：
文献类型：
--
作者：
G. Qian;Istv´n B´gyi;R. Pfeffer;H. Shaw;J. Stevens
通过观察两层不同颜色颗粒的混合，研究了旋转流化床中颗粒的运动。两层中的颗粒要么几乎相同，除了它们的颜色，要么具有不同的密度和尺寸分布。所有的颗粒都在常规流化床的Geldart-A分类中。流化后，但在混合之前，床层表现出一些流体的行为，即，内表面变得径向均匀。对于相同材料的颗粒层，在达到U{sub mfc}后发生混合，在混合速度下观察到气泡。U{sub mb}和U{sub mfc}之间没有实验差异;它们要么一致，要么几乎相等。气泡似乎是负责粒子运动和混合。当较致密的颗粒被放置在分配器上时，混合行为与对于相同材料的层所观察到的混合行为相似。然而，当密度较低的颗粒被放置在分配器上时，混合由密度差异主导，并且在气泡可见之前发生。
Particle motion in a rotating fluidized bed was studied by observing the mixing of two layers of particles of different colors. The particles in the two layers were either nearly identical, except for their color, or were of different density and size distribution. All of the particles were in the Geldart-A classification for conventional fluidized beds. After fluidization, but before mixing, the bed exhibited some fluid-like behavior, that is, the inner surface became radially uniform. For particle layers of the same material, mixing occurred after U{sub mfc} was reached, with bubbles observed at the mixing velocity. No experimental difference between U{sub mb} and U{sub mfc} could be discerned; they either coincided or were nearly equal. Bubbles appeared to be responsible for particle motion and mixing. When the denser particles are placed on the distributor, the mixing behavior was similar to that observed for layers of the same material. However, when the less dense particles are placed on the distributor, mixing is dominated by differences in density and occurs before bubbles are visible.