Simultaneous determination of micellar structure and drag reduction in a surfactant solution flow using the fluorescence probe method
Simultaneous determination of micellar structure and drag reduction in a surfactant solution flow using the fluorescence probe method
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DOI：
10.1063/1.5017526
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发表时间：
2018-03
影响因子：
4.6
通讯作者：
T. Wakimoto;K. Araga;K. Katoh
中科院分区：
文献类型：
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作者：
T. Wakimoto;K. Araga;K. Katoh
众所周知，向水中添加一种特定类型的表面活性剂可以减少管流中的阻力。这一效应被认为是由于棒状胶束的有序结构(被称为剪切诱导结构(SIS))抑制了湍流转变的结果。然而，通常很难确定SIS，因为在实际移动的流动中需要非侵入性地检测数百纳米的SIS。在这项研究中，我们使用荧光探针法来局部测定管流中的SIS。当将疏水性荧光分子加入到表面活性剂溶液中时，荧光分子被捕获在胶束中。因此，荧光强度根据胶束结构的变化而变化。验证了荧光探针法在SIS检测中的适用性，并通过同时测量荧光强度和表面张力，确定了胶束结构与管流减阻的关系。
As widely known, the addition of a specific type of surfactant to water reduces drag in a pipe flow. This effect is considered to be a result of the suppression of turbulent transition caused by the ordered structure of rod-like micelles that is referred to as a shear-induced structure (SIS). However, it is typically difficult to determine the SIS since it is necessary to noninvasively detect the SIS with several hundred nanometers in the actual moving flow. In this study, we used the fluorescence probe method to locally determine the SIS in a pipe flow. When hydrophobic fluorescence molecules are added to the surfactant solution, the fluorescence molecules are trapped in micelles. Thus, fluorescence intensity varies based on the change in the micellar structure. We verified the applicability of the fluorescence probe method to the SIS detection and determined the relationship between the micellar structure and the drag reduction in the pipe flow by simultaneously measuring the fluorescence intensity and ...