PARTICLE SEGREGATION IN FLUIDISED BINARY MIXTURES
PARTICLE SEGREGATION IN FLUIDISED BINARY MIXTURES
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DOI：
10.1016/0009-2509(93)80118-a
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发表时间：
1993
影响因子：
4.7
通讯作者：
A. Hoffmann;L. Janssen;J. Prins
中科院分区：
文献类型：
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作者：
A. Hoffmann;L. Janssen;J. Prins
在由不同类型的二元混合物组成的流化床中，颗粒偏析是由相同的颗粒输运过程控制的。“不同密度混合物”和“等密度混合物”的分离行为，这两种类型的系统到目前为止主要是单独研究和建模的，已经成功地模拟了使用相同的技术，并假设相同的输运过程在两种类型的系统中都是活跃的。实验结果表明，在这两种类型的混合物偏析剖面，但使用颗粒非常粗比那些通常研究，提出。讨论了粒子输运参数的意义。本文提出了B族粉末中气泡尾迹角的一种新的经验关系式，并证明了上升气泡尾迹与周围体体之间的物质交换速率与床层颗粒的最小流化速度无关。对未来的研究进行了讨论，认为这有助于更好地预测颗粒混合和分离。
The particle segregation in fluidised beds consisting of different types of binary mixtures is shown to be governed by the same particle transport processes. The segregation behaviour of both “different-density mixtures” and “equal-density mixtures”, two types of system which until now largely have been investigated and modelled separately, have been successfully simulated using the same technique, and assuming the same transport processes to be active in both types of system. Experimental results showing segregation profiles in both types of mixtures, but using particles very much coarser than those normally investigated, are presented. The significance of the particle transport parameters is discussed. A new empirical relation for the bubble wake angle in group B powders has been proposed, and it has been made likely that the rate of material interchange between the wake of a rising bubble and the surrounding bulk is independent of the minimum fluidisation velocity of the bed particles. A discussion of future research seen as useful for better prediction of particle mixing and segregation is provided.