Investigation of proper modeling of very dense granular flows in the recirculation system of CFBs

查看全文 作　　者：Aristeidis [1,2]Nikolopoulos;Nikos [2]Nikolopoulos;Nikos [1]Varveris;Sotirios [1]Karellas;Panagiotis [2]Grammelis;Emmanuel [1,2]Kakaras

机构地区：[1]Laboratory of Steam Boilers and Thermal Plants,Thermal Engineering Sector,School of Mechanical Engineering,NTUA,Athens,Greece;[2]Centre for Research and Technology Hellas,Institute for Solid Fuels Technology and Applications,Athens Gr-15310,Greece

出　　处：《Particuology》索引2012年第10卷第6期,共11页

基　　金：funded by the Research Programme of the Research Fund for Coal and Steel Coal RTD (Research Project CaL - Mod/RFCS-CT-2010-0013) 摘　　要：The aim of this paper is the development of new models and/or the improvement of existing numerical models,used for simulating granular flow in CFB(circulating fluidized bed) recirculation systems.Most recent models follow the TFM(two-fluid model) methodology,but they cannot effectively simulate the inter-particle friction forces in the recirculation system,because the respective stress tensor does not incorporate compressibility of flow due to change of effective particle density.As a consequence,the induced normal and shear stresses are not modeled appropriately during the flow of the granular phase in the CFB recirculation system.The failure of conventional models,such as that of von Mises/Coulomb,is mainly caused by false approximation of the yield criterion which is not applicable to the CFB recirculation system.The present work adopts an alternative yield function,used for the first time in TFM Eulerian modeling.The proposed model is based on the Pitman-Schaeffer-Gray-Stiles yield criterion.Both the temporal deformation of the solid granular phase and the repose angle that the granular phase forms are more accurately simulated by this model.The numerical results of the proposed model agree well with experimental data,implying that frictional forces are efficiently simulated by the new model. 关键词：再循环系统颗粒流数值模型建模密集屈服准则循环流化床双流体模型

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Investigation of proper modeling of very dense granular flows in the recirculation system of CFBs

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