MODELING OF CLUSTER AND ITS APPLICATION IN EMMS DRAG MODEL FOR HETEROGENEOUS GAS-SOLID FLOWS

摘要：

　　Cluster sub-models are developed and combined with the Energy Minimization Multi-Scale (EMMS) method drag model to improve drag predictions for heterogeneous gas-solid flows.Theoretical cluster sub-models are developed to relate the cluster parameters with the solid volume fraction.The cluster sub-models are validated using experimental data in the literature.Drag coefficients predicted by the modified EMMS model with cluster sub-models are much lower than previous EMMS results and agree well with the experiment-based model.The drag coefficients are minimum between solid volume fractions of 0.1 and 0.15 and gradually increase to that for uniform flow from the minimum towards both sides.The modified EMMS drag model is further verified by CFD simulations of gas-solid flows in a CFB riser by coupling with the two-fluid model.The verification of the modified EMMS model once again demonstrates the applicability of the cluster sub-models.

关键词： cluster drag model EMMS method heterogeneous gas-solid flows

作者: Chen Cheng Qi Haiying

作者单位: Key Laboratory for Thermal Science & Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,P.R.China

会议类型: 国际会议

会议名称: The 11th International Conference on Fluidized Bed Technology(CFB-11)(第十一届流化床技术国际会议)

会议地点: 北京

会议语种:英文

页码: 193-198

在线出版日期: 2014-05-14（万方平台首次上网日期，不代表论文的发表时间）