Size segregation of binary mixture of solids in bubbling fluidized beds
Size segregation of binary mixture of solids in bubbling fluidized beds
复制标题
鼓泡流化床中固体二元混合物的尺寸分离
DOI：
10.1016/s0032-5910(03)00126-8
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发表时间：
2003-08-05
影响因子：
5.2
通讯作者：
Qin, YK
中科院分区：
文献类型：
--
作者：
Lu, HL;He, YR;Qin, YK
对不同粒径的二元混合物在鼓泡流化床中的流化行为进行了实验和理论研究。对分离现象进行了分析，讨论了二元混合物压降分布与最小流化速度定义的关系。测量了颗粒质量分数沿着床层高度的分布，确定了二元混合物的平均粒径分布。本文提出了一种多流体气固两相流模型，其方程由颗粒运动理论导出。为每个颗粒类别构建单独的传输方程，允许尺寸类别之间的相互作用，以及相应类别和载气之间的动量和能量交换。预测了平均直径的偏析。对数值计算结果进行了分析，并与实验数据进行了比较。(C)2003 Elsevier B.V.保留所有权利。
The fluidization behavior of binary mixture differing in size in the gas bubbling fluidized bed is experimentally and theoretically studied. The segregation phenomena are analyzed, and the relevancy of the pressure drop profile of binary mixture to the definition of its minimum fluidization velocity is discussed. The distributions of mass fraction of particles along the bed height are measured, and the profiles of the mean particle diameters of binary mixture are determined. A multi-fluid gas-solid flow model is presented where equations are derived from the kinetic theory of granular flows. Separate transport equations are constructed for each of the particle class, allowing for the interaction between size classes, as well as the momentum and energy are exchanged between the respective classes and the carrier gas. The segregations of the mean diameter are predicted. The numerical results are analyzed and compared with experimental data. (C) 2003 Elsevier B.V. All rights reserved.