固体球通过蠕虫状胶束流体时的振动
Oscillations of a solid sphere falling through a wormlike micellar fluid
摘要：
我们提出了一个实验研究的运动的固体球通过蠕虫状胶束流体下降。当较小或较轻的球体迅速达到终极速度时，较大或较重的球体会在其下落运动的方向上振荡。这种不稳定性的开始与速度梯度尺度$Γ_{c}\sim 1$ s $^{-1}$的临界值相关。我们将这种情况与已知的蠕虫状胶束流体的复杂流变学，并建议该球的不稳定运动是由流动诱导结构的形成和破裂引起的。
英文摘要：
We present an experimental study of the motion of a solid sphere falling through a wormlike micellar fluid. While smaller or lighter spheres quickly reach a terminal velocity, larger or heavier spheres are found to oscillate in the direction of their falling motion. The onset of this instability correlates with a critical value of the velocity gradient scale $Γ_{c}\sim 1$ s$^{-1}$. We relate this condition to the known complex rheology of wormlike micellar fluids, and suggest that the unsteady motion of the sphere is caused by the formation and breaking of flow-induced structures.
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