Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows
Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows
复制标题
几种表面活性剂溶液在小尺寸管流中的拟层化效应
DOI：
10.1007/s00707-016-1616-3
复制
发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
and Takatsune Narumi
中科院分区：
文献类型：
--
作者：
Akiomi Ushida;Akira Ichijo;Taisuke Sato;Tomiichi Hasegawa;and Takatsune Narumi
非常小尺度的流体力学，特别是微细流动和纳米流动，有许多技术应用，即使对于非牛顿流体的稀溶液，小尺度流动的弹性性质也得到了强烈的表达。我们研究了具有球形或棒状胶束的水和几种类型的表面活性剂溶液的流动特性。在流动特性研究之前，用毛细管粘度计观察了试验流体的牛顿粘度和非牛顿粘度。实验测量了压力降，并估算了管子在直径133~2.87 mm范围内流过毛细管内的摩擦系数。对于水流，实验结果与Hagen-Poiseuille流和Blasius表达式的预测值吻合较好。球形胶束表面活性剂溶液的流动特性与水的流动特性一致。然而，棒状胶束表面活性剂溶液在过渡区保持层流流动。因此，具有棒状胶束的表面活性剂溶液具有拟层化效应。这些实验结果与估计的第一法向应力差之间的关系也被强烈地提出。
Fluid mechanics at a very small scale, particularly micro-flows and nano-flows, have many technical applications, and the elastic properties of small-scale flows are strongly expressed even for dilute aqueous solutions of non-Newtonian fluids. We have investigated the flow properties of water and several types of surfactant solutions with spherical or rod-like micelles. Before the flow property investigations, Newtonian and non-Newtonian viscosities for the test fluids were observed by using a capillary viscosity meter. Pressure drops were experimentally measured, and the frictional coefficient of the pipe was estimated in flows through capillaries ranging from 133m to 2.87 mm in diameter. For water flow, good agreement was obtained between the experimental results and the predictions for Hagen–Poiseuille flow and the Blasius expression. The flow properties of the spherical micelle surfactant solutions agreed with those of water. However, the rod-like micelle surfactant solutions maintained laminar flows in the transition regions. Thus, a pseudo-laminarization effect for surfactant solutions with rod-like micelles is indicated. A relationship between these experimental results and estimated first normal stress differences is also strongly suggested.