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首页> 外文会议>International Conference on Fluid Mechanics; 20040720-30; Dalian(CN) >EXPERIMENTAL STUDY ON TURBULENT STRUCTURE IN DRAG-REDUCING SURFACTANT SOLUTION CHANNEL FLOW—REYNOLDS NUMBER DEPENDENCE
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EXPERIMENTAL STUDY ON TURBULENT STRUCTURE IN DRAG-REDUCING SURFACTANT SOLUTION CHANNEL FLOW—REYNOLDS NUMBER DEPENDENCE

机译：减阻表面活性剂流道中湍流结构的实验研究-雷诺数相关性

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摘要

The structure of turbulence in a drag-reducing surfactant solution channel flow has been studied with particle image velocimetry. Measurements were performed for water and surfactant solution flow at three regions with different drag-reducing features: regions 2, 3 and 4 with respect to the Reynolds number, in the x-y and x-z planes for a total 500 frames for each run. The drag-reducing flows at regions 2 and 3 showed different characteristics, even though the DR levels were similar. The intensity of the wall-normal velocity fluctuations was decreased at both regions, but that of the streamwise velocity fluctuations, normalized with bulk velocity, was depressed at region 2 whereas increased at region 3 near the wall. The Reynolds shear stress was depressed more greatly at region 2. At region 4, the surfactant solution flow did not display characteristic features as in a Newtonian fluid flow.
机译：用颗粒图像测速技术研究了减阻表面活性剂溶液通道流动中的湍流结构。在三个具有不同减阻特征的区域进行了水和表面活性剂溶液流量的测量：相对于雷诺数的区域2、3和4，分别在x-y和x-z平面中每次运行500帧。即使DR级别相似，区域2和3的减阻流也表现出不同的特性。在两个区域，壁法向速度波动的强度均减小，但在区域2附近，按体积速度归一化的沿流速度波动的强度在壁2处被抑制，而在区域3则增加。在区域2处，雷诺剪应力被大大降低。在区域4中，表面活性剂溶液的流动没有牛顿流体中的特征。

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