开展了柱锥形气固流动特性的CFD—DEM耦合三维数值模拟研究。气相场采用基于欧拉坐标体系的k—E双方程湍流模型，固相场采用基于拉格朗日坐标体系的DEM直接数值模拟方法，跟踪离散颗粒场的每一个颗粒，考虑颗粒与颗粒（壁面）之间的碰撞力、曳力、重力、Magnus升力、Saffman升力。颗粒之间的碰撞采用Hertz．Mindlin无滑移模型计算。模拟对象为柱锥形喷动床，其直径为0．152m，喷口直径为0．019m，模拟颗粒数22万，探讨了喷动床中射流随时间的发展，不同气速下床内气固流动结构，以及颗粒速度与颗粒浓度的分布，并与实验数据进行了对比。
Three dimensional coupled CFD-DEM simulation was carried out on the cylindrical spouted bed with an inside diameter of 152 mm and a conical base of 60°. The particle motion was modeled by the DEM, and the gas motion was modeled by the k - s turbulent model. Drag force, contact force, Saffman lift force, Magnus lift force and gravitational force were considered in the models. On the basis of the simulation, the development of spout with time, different flow patterns at various gas velocity and the distributions of particle velocity and concentration were studied. The present simulated results were in well agreement with the experiments.
参考文献
| [1] | Lu HL.;He YR.;Liu WT.;Ding JM.;Gidaspow D.;Bouillard J. .Computer simulations of gas-solid flow in spouted beds using kinetic-frictional stress model of granular flow[J].Chemical Engineering Science,2004(4):865-878. |
| [2] | Du W;Bao XJ;Xu J;Wei WS .Computational fluid dynamics (CFD) modeling of spouted bed: Influence of frictional stress, maximum packing limit and coefficient of restitution of particles[J].Chemical Engineering Science,2006(14):4558-4570. |
| [3] | Shirvanian PA;Calo JM;Hradil G .Numerical simulation of fluid-particle hydrodynamics in a rectangular spouted vessel[J].International Journal of Multiphase Flow,2006(6):739-753. |
| [4] | Kawaguchi T.;Tanaka T.;Tsuji Y.;Sakamoto M. .Quasi-three-dimensional numerical simulation of spouted beds in cylinder[J].Powder Technology,2000(1/3):3-12. |
| [5] | Thank swasdisevi;Wiwut Tanthapanichakoon;Tawatchai Charinpanitkul;Toshihiro Kawaguchi;Toshitsugu Tanaka;Yutaka Tsuji .Investigation of Fluid and Coarse-Particle Dynamics in a Two-Dimensional Spouted Bed[J].Chemical Engineering & Technology: Industrial Chemistry -Plant Equipment -Process Engineering -Biotechnology,2004(9):971-981. |
| [6] | X.-L.Zhao;S.-Q.Li;G.-Q.Liu .DEM simulation of the particle dynamics in two-dimensional spouted beds[J].Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems,2008(2):205-213. |
| [7] | Zhong WQ;Xiong YQ;Yuan ZL;Zhang MY .DEM simulation of gas-solid flow behaviors in spout-fluid bed[J].Chemical Engineering Science,2006(5):1571-1584. |
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