Comparative analysis of CFD models for jetting fluidized beds: The effect of inter-phase drag force
Comparative analysis of CFD models for jetting fluidized beds: The effect of inter-phase drag force
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DOI：
10.1016/j.powtec.2011.12.043
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发表时间：
2012-05
影响因子：
5.2
通讯作者：
Pei Pei-Pei;Kai Zhang;D. Wen
中科院分区：
文献类型：
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作者：
Pei Pei-Pei;Kai Zhang;D. Wen
在模拟气固两相流动的欧拉-欧拉方法中，选择合适的界面力来描述两相之间的动量传递对颗粒动力学有着重要的影响。在对相间曳力模型进行详细评述的基础上，采用一个简单的两相流模型，研究了相间曳力对二维喷射流化床射流特性的影响。从不同的相间阻力模型的模拟结果进行了比较与设计的实验研究。定性和定量的结果表明，射流行为，包括固体体积分数的分布，床层压降，射流穿透深度和射流频率，可以显着影响拖曳力模型的选择。在这项工作中评估的模型都不能准确地预测所有这些参数。一些模型可以很好地预测平均值，但在预测动态方面很弱，反之亦然，这就要求在解释基于单一阻力模型的数据时要谨慎。
In the Eulerian–Eulerian approach for simulating gas–solid two-phase flow, a proper selection of an interfacial force to describe the momentum transfer between the two phases has a significant influence on the particle dynamics. Based on a detailed review of the inter-phase drag force models, a simple two-fluid model with zero particle-phase viscosity is used to investigate the effects of inter-phase drag force on the jet characteristics in a two-dimensional jetting fluidized bed. The simulation results from different inter-phase drag force models are compared with a designed experimental study. Both qualitative and quantitative results show that the jet behavior, including the distribution of solid volume fraction, bed pressure drop, jet penetration depth and jet frequency, could be significantly affected by the selection of drag force models. None of the models assessed in this work could predict all these parameters accurately. Some models can predict the averaged value well but are weak in predicting the dynamics and vice versa, which calls for a caution in interpreting data based on a single drag model.