Insights in hydrodynamics of bubbling fluidized beds at elevated pressure by DEM-CFD approach

查看全文 作　　者：Zahra [1]Mansourpour;Sedighe [1]Karimi;Reza [1]Zarghami;Navid [1]Mostoufi;Rahmat Sotudeh-[1]Gharebagh

机构地区：[1]Process Design and Simulation Research Center,Oil and Gas Centre of Excellence,School of Chemical Engineering,University of Tehran

出　　处：《Particuology》索引2010年第8卷第5期,共8页

摘　　要：A numerical simulation was conducted to study the effect of pressure on bubble dynamics in a gas-solid fluidized bed.The gas flow was modeled using the continuum theory and the solid phase,by the dis-crete element method(DEM).To validate the simulation results,calculated local pressure fluctuations were compared with corresponding experimental data of 1-mm polyethylene particles.It was shown that the model successfully predicts the hydrodynamic features of the fluidized bed as observed in the experiments.Influence of pressure on bubble rise characteristics such as bubble rise path,bubble sta- bility,average bubbles diameter and bubble velocity through the bed was investigated.The simulation results are in conformity with current hydrodynamic theories and concepts for fluidized beds at high pressures.The results show further that elevated pressure reduces bubble growth,velocity and stability and enhances bubble gyration through the bed,leading to change in bed flow structure. 关键词：加压流化床 DEM 力学方法气泡动力学水动力特性流体差价冒泡

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Insights in hydrodynamics of bubbling fluidized beds at elevated pressure by DEM-CFD approach

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