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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study on swirling flow of dilute surfactant solution with deformed free-surface
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Experimental study on swirling flow of dilute surfactant solution with deformed free-surface

机译：自由表面变形的稀表面活性剂溶液回旋流的实验研究

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An experimental investigation was performed on a swirling flow of dilute surfactant solution with deformed free-surface in a cylindrical container driven by the constantly rotating bottom wall. The purpose of the experiment was to estimate weak viscoelasticity in the tested surfactant solutions as well as to investigate the flow characteristics. The tested fluid was an aqueous solution of CTAC (CTAC: cetyltri-methyl ammonium chloride). which is a cationic surfactant. Water, 40 ppm, 60 ppm and 200 ppm CTAC solution flows were tested at Froude numbers ranging from 2.59 to 16.3. Particle image velocimetry (PIV) was used to measure the secondary velocity field in the meridional plane. The deformed free-surface level was extracted from the PIV images. At a similar Froude number, the depth of the dip formed at the center region of the free surface was decreased for CrAC solution flow compared with water flow. The inertia-driven vortex at the up-right corner in the meridional plane becomes more and more weakened with increase of the solution concentration or viscoelasticity. Through analyzing the overall force balance compared with water flow, the first normal stress difference characterizing the viscoelasticity was estimated for the dilute CTAC solution flows. The result supports the viscoelasticity-based turbulent drag-reduction mechanism of surfactant solution flow. (C) 2008 Elsevier Inc. All rights reserved.
机译：在由不断旋转的底壁驱动的圆柱形容器中，对具有变形的自由表面的稀表面活性剂溶液的涡流进行了实验研究。该实验的目的是评估测试表面活性剂溶液中的弱粘弹性，并研究其流动特性。所测试的流体是CTAC的水溶液（CTAC：十六烷基三甲基氯化铵）。它是阳离子表面活性剂。在2.59至16.3的Froude数下测试了40 ppm，60 ppm和200 ppm CTAC水的流量。粒子图像测速（PIV）用于测量子午平面中的次级速度场。从PIV图像中提取变形的自由表面水平。在相似的弗劳德数下，与水流相比，CrAC溶液流在自由表面中心区域形成的浸入深度减小。随着溶液浓度或粘弹性的增加，子午面右上角的惯性驱动涡流变得越来越弱。通过分析与水流相比的总体力平衡，估算了稀释的CTAC溶液流的第一个表示粘弹性的法向应力差。结果支持表面活性剂溶液流基于粘弹性的湍流减阻机理。 （C）2008 Elsevier Inc.保留所有权利。

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