Evaluation of different mathematical models in the CFD-DEM simulation of conical spouted bed fluid dynamics

IF 1 4区 工程技术 Q4 CHEMISTRY, APPLIED
R. Béttega
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引用次数: 1

Abstract

The input parameters, empirical, and semi-empirical models significantly influence the responses obtained by CFD-DEM simulations. In this work, the effect of three turbulence models, three conditions of the particle rotation, and five drag models on the fluid dynamic behavior of a conical spout bed applied to the drying of sorghum grains were evaluated. Experimental data on the solids pressure drop, height, and shape of the fountain were used to validate the simulations. Results showed the importance of including the particle rotation in the model to approximate the results simulated with the experimental behavior. Compared with experimental data, considering the particle rotation by Dennis et al. model, the deviation was of the 2% for the fountain height and 9.18% for the pressure drop. While for the model without the particle rotation, the deviations were 106.33% and 42.31% for the fountain height and pressure drop, respectively. For the analyzed case, the standard k-? turbulence model showed a greater agreement with the experimental data. For the drag models evaluated, the best fit with the experimental data was obtained by the Koch-Hill drag model, followed by the Gidaspow model, with deviations less than 10%.
不同数学模型在锥形喷流床流体动力学CFD-DEM模拟中的评价
输入参数、经验和半经验模型显著影响CFD-DEM模拟得到的响应。本文研究了三种湍流模型、三种颗粒旋转条件和五种阻力模型对用于高粱颗粒干燥的锥形喷床流体动力学特性的影响。利用固体压降、喷泉高度和喷泉形状的实验数据验证了模拟结果。结果表明,在模型中加入粒子旋转对接近实验行为模拟结果的重要性。与实验数据相比,Dennis等人的模型考虑粒子旋转,喷泉高度偏差为2%,压降偏差为9.18%。而对于不考虑粒子旋转的模型,喷泉高度和压降的偏差分别为106.33%和42.31%。对于所分析的情况,标准k-?湍流模型与实验数据吻合较好。在所评估的阻力模型中,与实验数据拟合最好的是Koch-Hill阻力模型,其次是Gidaspow模型,偏差小于10%。
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来源期刊
Chemical Industry & Chemical Engineering Quarterly
Chemical Industry & Chemical Engineering Quarterly CHEMISTRY, APPLIED-ENGINEERING, CHEMICAL
CiteScore
2.10
自引率
0.00%
发文量
24
审稿时长
3.3 months
期刊介绍: The Journal invites contributions to the following two main areas: • Applied Chemistry dealing with the application of basic chemical sciences to industry • Chemical Engineering dealing with the chemical and biochemical conversion of raw materials into different products as well as the design and operation of plants and equipment. The Journal welcomes contributions focused on: Chemical and Biochemical Engineering [...] Process Systems Engineering[...] Environmental Chemical and Process Engineering[...] Materials Synthesis and Processing[...] Food and Bioproducts Processing[...] Process Technology[...]
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