蠕虫状胶束溶液的法拉第不稳定性
The Faraday instability in wormlike micelle solutions
摘要：
垂直振动下的半稀释蠕虫状胶束溶液的行为进行了研究，使用经典的测量的法拉第不稳定性阈值，以及两个新的实验的基础上粒子成像测速和双折射。我们提供的证据存在的振荡的临界加速度和波数的振动频率，这是链接到振荡的速度和双折射场沿垂直方向。这些观测结果被解释为在整个流体层的弹性驻波。用S. Kumar [Phys.Rev.E65，026305（2002）]的方法计算粘弹性流体的速度场和变形场。最后，进一步的双折射实验以上的不稳定性阈值表明，法拉第不稳定性不会引起解缠结和胶束网络的断裂。
英文摘要：
The behaviour of semi-dilute wormlike micelle solutions under vertical vibrations is investigated using classical measurements of the Faraday instability threshold along with two new experiments based on particle imaging velocimetry and birefringence. We provide evidence for the presence of oscillations of the critical acceleration and wave number with the vibration frequency, which are linked to oscillations of the velocity and birefringence fields along the vertical direction. These observations are interpreted in terms of standing elastic waves across the fluid layer. Such an interpretation is confirmed numerically by using the model proposed by S. Kumar [Phys. Rev. E 65, 026305 (2002)] for a viscoelastic fluid to calculate the velocity and deformation fields. Finally, further birefringence experiments above the instability threshold show that the Faraday instability does not induce disentanglement and breakage of the micellar network.
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