幂律流体偏心环管流动中公转的影响  

IMPACT OF ORBITAL MOTION OF THE ECCENTRIC INNER PIPE ON POWER-LAW FLUID ANNULAR FLOW

作　　者：冯顺新[1] 李启兵[1] 符松[1] 

机构地区：[1]清华大学工程力学系,北京100084

出　　处：《工程力学》2006年第A01期11-15,共5页Engineering Mechanics

基　　金：国家自然科学基金(10232020);斯伦贝谢公司项目

摘　　要：数值模拟了压力驱动的幂律流体环管流动中,当流动为充分发展层流、且内管在偏心自转时内管公转的影响。结果表明当内管偏心自转时,其同时存在的公转对环管内压强和内管表面剪应力的分布影响显著。和自转同向的公转在一定强度范围内具有使流动阻力减小的效果,这和公转对由内管偏心自转导致的二次流范围的压缩以及幂律流体剪切变稀的特性有关。流动阻力随公转的变化不是单调的,在各偏心率下均存在一个使流动阻力最小的公转强度。Effect of the orbital motion of an eccentric inner pipe on annular laminar flow is investigated numerically, with the inner pipe rotating, the flow being fully-developed laminar and the fluid in power-law type. The results shows that the orbital motion of the inner pipe always has significant influence on the distribution of pressure and shear stress on the surface of the inner pipe. The orbital motion usually causes the reduction of flow resistance, which has relations with the compression to the secondary flow by the orbital motion and also the shear-thinning effect of the power-law fluid. The variation of the flow resistance with the intensity of the orbital motion is not monotonic. At each eccentricity, there exists a critical intensity for the orbital motion, at which the flow resistance is the lowest.

关 键 词：环管流动 幂律流体 偏心 公转 流动阻力 

分 类 号：O357.1[理学—流体力学]