LOCAL SLIP VELOCITY IN A DOWNER  

作　　者：Songgeng Li Weigang Lin Jianzhong Yao 

机构地区：[1]Key Laboratory of Multi-phase Reaction,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100080,P.R.China

出　　处：《China Particuology》2003年第6期258-261,共4页

基　　金：supports from the National Program of Basic Research(No.G1999022103);Key Project of the National Natural Science Foundation of China(No.29936090)are gratefully acknowledged.

摘　　要：Based on the EMMS model, the local slip velocity between gas and solid is systematically analyzed and a theoretical correlation of local slip velocity with local voidage for a downer is derived as follows:U_s(r)/U_t=D^(8/7)(1-ε_mt)^(-2/7)[(1-ε(r)/(ε(r))]^(8/7)]ε(r)(47/14)((ε(r)-ε_(mt))/ε(r)) Using this correlation, the local gas-solid slip velocity in a downer is calculated. The calculated results are well consistent with experimental data. In addition, the variation of the local slip velocity with its corresponding solid holdup is also dis-cussed.Based on the EMMS model, the local slip velocity between gas and solid is systematically analyzed and a theoretical correlation of local slip velocity with local voidage for a downer is derived as follows:U_s(r)/U_t=D^(8/7)(1-ε_mt)^(-2/7)[(1-ε(r)/(ε(r))]^(8/7)]ε(r)(47/14)((ε(r)-ε_(mt))/ε(r)) Using this correlation, the local gas-solid slip velocity in a downer is calculated. The calculated results are well consistent with experimental data. In addition, the variation of the local slip velocity with its corresponding solid holdup is also dis-cussed.

关 键 词：EMMS model local slip velocity VOIDAGE DOWNER 

分 类 号：O359[理学—流体力学]