幂律流体流过扩张型圆锥流道时挤出胀大比的理论预示  

Theoretical Prediction of Die Swell Ratio of a Power-Law Fluid Flowing Through an Enlarged Conical Channel

作　　者：臧昆[1] 

机构地区：[1]北京服装学院机械与自动化系

出　　处：《北京服装学院学报（自然科学版）》1994年第2期40-47,共8页Journal of Beijing Institute of Fashion Technology：Natural Science Edition

摘　　要：从连续方程和运动方程出发，对一种幂律流体流过扩张型圆锥流道时的流动进行了分析计算，得到了挤出胀大比Ｂ与法向应力差Ｎ之间的回归关系．研究结果表明：在圆锥流道张角α不大时Ｂ值较小，α角增加，Ｂ值有增大的趋势；当α角一定时，法向应力差Ｎ增加，则Ｂ值也增大．这一结论对于喷丝板的设计具有参考意义．he flow of a power-law fluid flowing through an enlarged conical channel wasstudied, thus regressive relationships between die swell ratio B and normal stress difference N were obtained. The conclusions will be a significant reference to the designing ofspinneret holes.

关 键 词：幂律流体 挤出胀大比 圆锥流道 熔融纺丝 

分 类 号：TQ340.141[化学工程—化纤工业] O373[理学—流体力学]