Hydrodynamic modeling of particle rotation for segregation in bubbling gas-fluidized beds
Hydrodynamic modeling of particle rotation for segregation in bubbling gas-fluidized beds
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DOI：
10.1016/j.ces.2005.09.003
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发表时间：
2006-03
影响因子：
4.7
通讯作者：
Jin Sun;F. Battaglia
中科院分区：
文献类型：
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作者：
Jin Sun;F. Battaglia
利用动力学理论，将颗粒旋转引入到多流体欧拉模型中，改进了微摩擦球体快速颗粒流模型。在不改变现有动力学理论框架的情况下，引入有效恢复系数，考虑摩擦碰撞引起的能量耗散，建立了一个简化的模型。对单分散鼓泡流化床中的气泡动力学和床层膨胀以及双分散鼓泡流化床中的分凝现象进行了模拟研究。结果之间进行了比较，没有和粒子旋转和相应的实验结果的模拟。结果表明，考虑颗粒旋转的多流体模型能更好地反映气泡动力学和时均床层行为。模型预测的偏析百分比同意与实验数据中的流化制度，动力学理论是有效的描述偏析和混合。
A multi-fluid Eulerian model has been improved by incorporating particle rotation using kinetic theory for rapid granular flow of slightly frictional spheres. A simplified model was implemented without changing the current kinetic theory framework by introducing an effective coefficient of restitution to account for additional energy dissipation due to frictional collisions. Simulations without and with particle rotation were performed to study the bubble dynamics and bed expansion in a monodispersed bubbling gas-fluidized bed and the segregation phenomena in a bidispersed bubbling gas-fluidized bed. Results were compared between simulations without and with particle rotation and with corresponding experimental results. It was found that the multi-fluid model with particle rotation better captures the bubble dynamics and time-averaged bed behavior. The model predictions of segregation percentages agreed with experimental data in the fluidization regime where kinetic theory is valid to describe segregation and mixing.