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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >CFD simulation via conventional, Two-Fluid Model of a circulating fluidized bed riser: Influence of models and model parameters on hydrodynamic behavior
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CFD simulation via conventional, Two-Fluid Model of a circulating fluidized bed riser: Influence of models and model parameters on hydrodynamic behavior

机译：通过循环流化床立管的常规两流体模型进行CFD模拟：模型和模型参数对流体动力学行为的影响

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A two-dimensional (2D) numerical simulation of gas-solids flow in a circulating fluidized bed riser was performed based on the Two-Fluid Model (TFM). In this model, the kinetic theory of granular flows (KTGF) was used to solve gas-solids flow behavior. Despite several published studies, the selection of proper wall boundary conditions (BC) and the appropriate closure model to simulate riser flow remains inconclusive. In this study, a number of simulations were performed to understand the influence of the wall boundary condition, solid shear viscosity model and particle-particle restitution coefficient. At first, we systematically evaluated the influence of the combined effect of the specularity and particle-wall restitution coefficients based on Johnson and Jackson [1] BC. The key point we observed was that the effect of high specularity coefficient (phi = 0.001) was less at low particle-wall restitution coefficients (e(w) = 0.8, 0.9) on the axial solid holdup profile. At lower specularity coefficient (phi = 0.00001 & 0.0001) value, different particle-wall restitution coefficients (e(w) = 0.8, 0.9, 0.99) did not show any significant effect. Moreover, the effect of the elasticity of particle collisions showed that the low particle-particle restitution coefficients gave good quantitative agreement. The effects of solid shear viscosity models on flow predictions were investigated under different solid circulation rates (G(s) = 39.14 kg/m(2) s, 51.05 kg/m(2) s, 73.21 kg/m(2) s). Both Syamlal et al. [2] and Gidaspow [3] models gave good qualitative agreement with the experimental results. The Syamlal et al. solid viscosity model demonstrated fairly consistent results in the dilute region, whereas transition from lower to higher solid holdup was reasonably well predicted by the Gidaspow model. (C) 2014 Elsevier B.V. All rights reserved.
机译：基于双流体模型（TFM），对循环流化床立管中的气固流动进行了二维（2D）数值模拟。在该模型中，使用颗粒流动力学理论（KTGF）来解决气固两相流的行为。尽管有数篇已发表的研究，选择合适的壁边界条件（BC）和模拟立管流量的合适封闭模型仍然没有定论。在这项研究中，进行了许多模拟，以了解壁边界条件，固体剪切粘度模型和颗粒-颗粒复原系数的影响。首先，我们根据约翰逊和杰克逊[1] BC系统地评估了镜面反射率和颗粒壁恢复系数的综合影响。我们观察到的关键点是，在低的颗粒壁回复系数（e（w）= 0.8，0.9）下，高镜面反射系数（phi = 0.001）对轴向固体持留量的影响较小。在较低的镜面反射系数（phi = 0.00001和0.0001）值下，不同的粒子壁恢复系数（e（w）= 0.8、0.9、0.99）不会显示任何明显的影响。此外，粒子碰撞弹性的影响表明低的粒子-粒子复原系数给出了良好的定量一致性。在不同的固体循环速率下（G（s）= 39.14 kg / m（2）s，51.05 kg / m（2）s，73.21 kg / m（2）s）研究了固体剪切粘度模型对流量预测的影响。双方Syamlal等。 [2]和Gidaspow [3]模型与实验结果给出了很好的定性一致性。 Syamlal等。固体粘度模型在稀薄区域显示出相当一致的结果，而Gidaspow模型可以很好地预测从较低固含量到较高固含量的转变。 （C）2014 Elsevier B.V.保留所有权利。

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