The Effect of Cohesive Forces on the Fluidization of Aeratable Powders
The Effect of Cohesive Forces on the Fluidization of Aeratable Powders
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DOI：
10.1002/aic.14307
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发表时间：
2014-02-01
期刊：
影响因子：
3.7
通讯作者：
Benyahia, Sofiane
中科院分区：
文献类型：
--
作者：
Galvin, Janine E.;Benyahia, Sofiane
采用数值方法研究了可通气A型粉末在Geldart分级中流化/脱流化过程中范德华黏结力的影响。研究了摩擦和粒径分布对最小流化速度和鼓泡速度等设计参数的影响。对于这些类型的颗粒，为了充分展示摩擦在常见现象中所起的作用，如压力超调和最小流化周围的滞后，需要观察内聚力。该研究还表明，由十几种粒径组成的完整实验PSD可以由几个粒径充分代表。减少颗粒类型的数量可以减少计算费用，同时保持预测的准确性，从而有利于基于颗粒流动动力学理论的连续介质方法。中国化学工程学报（英文版），2014年第4期
The effects of cohesive forces of van der Waals type in the fluidization/defluidization of aeratable type A powders in the Geldart classification are numerically investigated. The effects of friction and particle-size distribution (PSD) on some design-significant parameters, such as minimum fluidization and bubbling velocities, are also investigated. For these types of particles, cohesive forces are observed as necessary to fully exhibit the role friction plays in commonly observed phenomena, such as pressure overshoot and hysteresis around minimum fluidization. This study also shows that a full-experimental PSD consisting of a dozen particle sizes may be sufficiently represented by a few particle diameters. Reducing the number of particle types may benefit the continuum approach, which is based on the kinetic theory of granular flow, by reducing computational expense, while still maintaining the accuracy of the predictions. Published 2013 American Institute of Chemical Engineers AIChE J 60: 473-484, 2014