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arXiv 1306.3811cond-mat.softphysics.flu-dyn
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蠕虫状胶束溶液对垂直光纤Rayleigh-Plateau不稳定性的抑制

Suppression of the Rayleigh-Plateau instability on a vertical fibre coated with wormlike micelle solutions

François Boulogne, Marc-Antoine Fardin, Sandra Lerouge, Ludovic Pauchard, Frédérique Giorgiutti-Dauphiné

摘要:

我们报告的瑞利高原不稳定性膜的巨胶束溶液涂层的垂直纤维。我们观察到,薄膜涂层的纤维的动力学可能是非常不同的牛顿或标准的非牛顿的情况下。通过改变溶液组分的浓度和取决于膜厚度,我们首次表明,瑞利-高原不稳定性可以稳定使用表面活性剂溶液。使用全球流变学和光学可视化,我们表明,剪切诱导结构的发展是需要稳定沿纤维的胶束膜。假设剪切引起的状态的粘弹性性质可以通过一个简单的模型来描述,我们建议,除了剪切引起的结构的存在下,后者必须有一个弹性模量大于从线性稳定性分析评估的临界值。最后,我们的分析提供了一种方法来估计剪切诱导状态的体弹性。

英文摘要:

We report on the Rayleigh-Plateau instability in films of giant micelles solutions coating a vertical fibre. We observe that the dynamics of thin films coating the fibre could be very different from the Newtonian or standard Non-Newtonian cases. By varying the concentration of the components of the solutions and depending on the film thickness, we show for the first time that the Rayleigh-Plateau instability can be stabilized using surfactant solutions. Using global rheology and optical visualisations, we show that the development of shear-induced structures is required to stabilize the micellar film along the fibre. Assuming that the viscoelastic properties of the shear-induced state can be described by a simple model, we suggest that, in addition to the presence of shear-induced structures, the latter must have an elastic modulus greater than a critical value evaluated from a linear stability analysis. Finally, our analysis provides a way of estimating the bulk elasticity of the shear-induced state.

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