UNSTEADY INTERMITTENT FLOW IN A ROTATING CURVED PIPE  

作　　者：YINJian-an SHENXin-rong CHENHua-jun ZHANGBen-zhao 

机构地区：[1]DepartmentofMechanics,ZhejiangUniversity,Hangzhou310027,China,e-mail：mec-zbzq@emb,zju.edu.cn

出　　处：《Journal of Hydrodynamics》2004年第2期158-165,共8页水动力学研究与进展B辑（英文版）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChina.(GrantNo :10 2 72 0 96 )

摘　　要：The effects of rotation and intermittent frequency on the flow transition ofsecondary flow and, main flow were examined in detail. Certain hitherto unknown flow patterns werefound. A numerical study was performed to study the characteristics of unsteady intermittent flow ina rotating curved pipe. Due to the rotation, both the Coriolis force and the centrifugal forcecould contribute to the unsteady intermittent flow and some complicated phenomena can be found. Theresults indicate that the unsteady intermittent flow are mainly characterized by five parameters:the Dean number Dn, the curvature κ, the maximal force ratio F (of the Coriolis force to thecentrifugal force in a cycle), the intermittent frequency parameter η (the ratio of a pulslatingtime to the cycle period), and the Womersley number α. Present works shows the natures of theunsteady intermittent flow in a rotating curved pipe.The effects of rotation and intermittent frequency on the flow transition ofsecondary flow and, main flow were examined in detail. Certain hitherto unknown flow patterns werefound. A numerical study was performed to study the characteristics of unsteady intermittent flow ina rotating curved pipe. Due to the rotation, both the Coriolis force and the centrifugal forcecould contribute to the unsteady intermittent flow and some complicated phenomena can be found. Theresults indicate that the unsteady intermittent flow are mainly characterized by five parameters:the Dean number Dn, the curvature κ, the maximal force ratio F (of the Coriolis force to thecentrifugal force in a cycle), the intermittent frequency parameter η (the ratio of a pulslatingtime to the cycle period), and the Womersley number α. Present works shows the natures of theunsteady intermittent flow in a rotating curved pipe.

关 键 词：unsteady flow secondary flow rotating pipes 

分 类 号：O357[理学—流体力学]