The effects of viscoelasticity on the transient motion of a sphere in a shear-thinning fluid
The effects of viscoelasticity on the transient motion of a sphere in a shear-thinning fluid
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粘弹性对剪切稀化流体中球体瞬态运动的影响
DOI：
10.1122/1.550803
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发表时间：
1997
影响因子：
3.3
通讯作者：
G. McKinley
中科院分区：
文献类型：
--
作者：
Mark T. Arigo;G. McKinley
我们提出了第一个定量的实验测量的瞬态运动的一个球，因为它加速从休息沿着中心线的管含有高弹性，剪切稀化，聚丙烯酰胺水溶液。对于所有与剪切速率相关的Deborah数（1.6 <$De（γ）<$4.2）和球管比（0.089 <$a/R <$0.387），观察到球体速度的瞬态振荡，通常导致球体“反弹”，或在第一次振荡期间反向。这些测量结果与King和沃茨（1972）的分析在定性上是一致的，他们提出了一个解析解，用于求解球体通过由线性Jeffreys模型描述的无界流体区域的瞬态运动。我们也表现出类似的响应，在一维蠕变实验中定量描述的多模配方的上随体麦克斯韦模型，包括溶剂延迟项。这样的实验从联合收割机中分离出剪切运动学.
We present the first quantitative experimental measurements of the transient motion of a sphere as it accelerates from rest along the centerline of a tube containing a highly elastic, shear-thinning, aqueous polyacrylamide solution. For all shear-rate-dependent Deborah numbers (1.6⩽De(γ)⩽4.2) and sphere-to-tube ratios (0.089⩽a/R⩽0.387) investigated, transient oscillations in the velocity of the sphere are observed, often causing the sphere to “rebound,” or reverse directions during the first oscillation. These measurements are in qualitative agreement with the analysis of King and Waters (1972) who presented an analytic solution for the transient motion of a sphere through an unbounded domain of fluid described by the linear Jeffreys model. We also show a similar response in one-dimensional creep experiments which are described quantitatively by a multimode formulation of the upper-convected Maxwell model including a solvent retardation term. Such experiments isolate the shear kinematics from the combine...