Two- and three-dimensional computational studies of liquid-solid fluidization
Two- and three-dimensional computational studies of liquid-solid fluidization
复制标题
液固流态化的二维和三维计算研究
DOI：
10.1016/j.powtec.2012.09.046
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发表时间：
2013-02
影响因子：
5.2
通讯作者：
ani Stefano
中科院分区：
文献类型：
--
作者：
Guan, Yanjun;Yao, Xiuying;Yao, Xiuying;Li, Yunning;Li, Yunning;Fan, Xianfeng;Fan, Xianfeng;Br;ani Stefano;Br;ani Stefano
本文采用Brandani和Zhang（2006）提出的简单双流体模型对二维和三维液固流化床的流体力学特性进行了比较。该模型考虑了Gidaspow（1994）的无粘模型A中的粒子对动量方程的影响。数值模拟是在CFX4.4平台上进行的，CFX4.4是一个商业CFD代码，与用户定义的FORTRAN子程序一起。基于二维床层中网格尺寸和时间步长的独立性，在液体入口速度和液-固系统的物理性质突变后，详细的流体动力学在二维和三维床层中进行了数值比较。计算结果表明，当液体入口速度降低或液固密度差和液体粘度增加时，二维和三维床层的床层高度、表面高度和垂直固含率分布具有良好的一致性。但是，当液体入口速度增加或颗粒直径减小时，二维和三维模拟的表面高度和垂直固含率分布存在差异。
The present work compares the hydrodynamics in the 2-dimension (2-D) and 3-dimension (3-D) liquid–solid fluidized beds using a simple two-fluid model suggested by Brandani and Zhang (2006). This model considers the effect of the particles dispersed on the momentum equations into the inviscid model A of Gidaspow (1994). Numerical simulations are conducted in the platform of CFX 4.4, a commercial CFD code, together with user-defined FORTRAN subroutines. Based on the independence of mesh size and time step in the 2-D bed, detailed hydrodynamics are compared numerically in the 2-D and 3-D beds after a sudden change in the liquid inlet velocity and the physical property of the liquid–solid system. The computational results show that the bed height, surface height and vertical solid holdup profile within the 2-D and 3-D beds are in the good agreement after a decrease in the liquid inlet velocity or an increase in the liquid–solid density difference and liquid viscosity. However, the differences of surface height and vertical solid holdup profile are found between the 2-D and 3-D simulation when the liquid inlet velocity is increased or the particle diameter is decreased.
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