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Effects of drag and subgrid-scale turbulence modeling on gas–solid hydrodynamics of a pilot-scale circulating fluidized bed
Chemical Engineering Science ( IF 4.1 ) Pub Date : 2021-09-08 , DOI: 10.1016/j.ces.2021.117093
Saurabh Gupta 1 , Santanu De 1 , Chanchal Loha 2 , Malay Karmakar 2
Affiliation  

Large eddy simulation is performed on a circulating fluidized bed (CFB) based on an Eulerian-Eulerian approach. The riser of the CFB has two axial sections of different diameters joined by a diffuser. The effects of drag and subgrid-scale models are examined on hydrodynamic parameters, such as solids volume fraction (εs), solids circulation rate (Gs), and full loop pressure profiles. A hybrid energy minimization multi-scale (EMMS) drag model is applied that combines EMMS drag models for the bubbling and the fast fluidized bed regimes. Experiments are conducted on a pilot-scale CFB model, and numerical results are validated against the experimental measurements of pressure and Gs. The change in the riser diameter has a significant influence on axial- and radial profiles of εs, particularly in the upper riser section. The hybrid EMMS drag model and the sgs-TKE turbulence model give the best agreement to the experimental data.



中文翻译:

阻力和亚网格尺度湍流模型对中试循环流化床气固流体动力学的影响

基于欧拉-欧拉方法在循环流化床 (CFB) 上进行大涡模拟。CFB 的立管具有由扩散器连接的两个不同直径的轴向部分。检查阻力和亚网格尺度模型对流体动力学参数的影响,例如固体体积分数(ε), 固体循环率 (G),以及全回路压力曲线。应用混合能量最小化多尺度 (EMMS) 阻力模型,该模型结合了用于鼓泡和快速流化床制度的 EMMS 阻力模型。实验是在中试规模的 CFB 模型上进行的,数值结果根据压力和G. 立管直径的变化对立管的轴向和径向剖面有显着影响。ε,特别是在上立管部分。混合 EMMS 阻力模型和sgs -TKE 湍流模型与实验数据最吻合。

更新日期:2021-09-24
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