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泡沫在收敛通道中的流动。

Flow of foam through a convergent channel.

作者信息

Dollet Benjamin, Bocher Claire

机构信息

Institut de Physique de Rennes, UMR 6251 CNRS/Université Rennes 1, Bâtiment 11A, 35042, Rennes Cedex, France.

出版信息

Eur Phys J E Soft Matter. 2015 Nov;38(11):123. doi: 10.1140/epje/i2015-15123-3. Epub 2015 Nov 26.

Abstract

We study experimentally the flow of a foam confined as a bubble monolayer between two plates through a convergent channel. We quantify the velocity, the distribution and orientation of plastic events, and the elastic stress, using image analysis. We use two different soap solutions: a sodium dodecyl sulfate (SDS) solution, with a negligible wall friction between the bubbles and the confining plates, and a mixture containing a fatty acid, giving a large wall friction. We show that for SDS solutions, the velocity profile obeys a self-similar form which results from the superposition of plastic events, and the elastic deformation is uniform. For the other solution, the velocity field differs and the elastic deformation increases towards the exit of the channel. We discuss and quantify the role of wall friction on the velocity profile, the elastic deformation, and the rate of plastic events.

摘要

我们通过实验研究了一种泡沫在收敛通道中作为气泡单层被限制在两块平板之间的流动情况。我们使用图像分析来量化速度、塑性事件的分布和取向以及弹性应力。我们使用两种不同的肥皂溶液:一种是十二烷基硫酸钠(SDS)溶液,气泡与限制平板之间的壁面摩擦力可忽略不计;另一种是含有脂肪酸的混合物,会产生较大的壁面摩擦力。我们表明,对于SDS溶液,速度分布遵循一种自相似形式,这是由塑性事件的叠加导致的,并且弹性变形是均匀的。对于另一种溶液,速度场不同,并且弹性变形朝着通道出口增加。我们讨论并量化了壁面摩擦力对速度分布、弹性变形和塑性事件发生率的作用。

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