Comparative CFD Analysis of Heterogeneous Gas–Solid Flow in a Countercurrent Downer Reactor
Comparative CFD Analysis of Heterogeneous Gas–Solid Flow in a Countercurrent Downer Reactor
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DOI：
10.1021/ie403496a
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发表时间：
2014-02
影响因子：
4.2
通讯作者：
Z. Shu;Guo Peng;Junwu Wang;N. Zhang;Songgeng Li;Weigang Lin
中科院分区：
文献类型：
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作者：
Z. Shu;Guo Peng;Junwu Wang;N. Zhang;Songgeng Li;Weigang Lin
输入参数对气固流动欧拉模拟结果的影响已经得到了广泛的认识。本文通过对比研究，研究了输入参数对逆流下行反应器内气固流体力学的影响。根据前人对其他类型气态化床的研究，得出欧拉模型的输入参数，包括恢复系数、镜面系数和阻力相关性对床层流体力学有重要影响的结论。更重要的是，我们证明了通过改变壁面边界条件或通过修正相间阻力来匹配实验数据是可能的。因此，没有唯一的方法来调整输入参数以适应实验数据。该研究表明，研究人员在选择输入参数时必须非常谨慎，并强调了对最先进的欧拉模型进行严格的实验测试的要求。
It has been widely recognized that input parameters affected the results of Eulerian simulation of gas-solid flow. In this study, a comparative study was performed to study the effect of input parameters on the hydrodynamics of gas-solid flow in a countercurrent downer reactor. It was concluded that the input parameters of the Eulerian model, including restitution coefficients, specularity coefficient, and drag correlation, have a major effect on the bed hydrodynamics, in accordance with previous studies on other types of gas-fluidized beds. More importantly, we show that it is possible to match the experimental data either by changing the wall boundary conditions or by correcting the interphase drag force. Therefore, there is no unique way to tune the input parameters to fit the experimental data. This study indicated that researchers have to pay great caution when selecting input parameters and highlighted the requirement of stringent experimental tests of the state-of-the-art Eulerian models.