Giesekus流体在环形流道中脉动挤出的应力分析  

SHEAR STRESS ANALYSIS OF GIESEKUS FLUID FOR ITS ANNULAR OSCILLATORY POISEUILLE FLOW

作　　者：邹国享[1] 瞿金平[1] 

机构地区：[1]华南理工大学聚合物新型成型装备国家工程中心,广州510640

出　　处：《振动与冲击》2006年第6期1-4,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(10472034);高等学校博士点学科点专项科研基金项目(20030561014)

摘　　要：以G iesekus粘弹模型为基础,推导出了轴向振动力场作用下聚合物熔体在环形流场中的应力计算公式,并结合实际的模型参数作了分析。结果表明:在环形流道中,流体的应力是半径和时间的函数,剪切应力与时间成余弦关系。内半流场的剪切应力随半径变化速率要明显大于外半流场的剪切应力变化速率,内环壁面处的剪切应力也要大于外环壁面处的剪切应力,τiw/τcw随k值变小而变大。Flow of viscoelastic fluids in annular geometry is of considerable industrial interest.The mathematical model of shear stress of Giesekus fluid for an axial annular flow of polymer melt under vibration force field(VFF) is set up.To demonstrate effects of vibrating intensity parameter and model parameter,curves of the shear stress distribution are made according to different parameters.The results show that the VFF will result in a periodic variation of shear stress in the channel.The shear stress on outer ring wall(τ_(ow))is less than that(τ_(iw))on inner ring wall. τ_(iw)/τ_(ow) depends on the(ratio) of the outer ring radius and the inner ring one.

关 键 词：振动力场 剪切应力 Giesekus流体 环形流道 

分 类 号：TQ32[化学工程—合成树脂塑料工业]