| 矩形槽道内表面活性剂减阻流体流场特性 |
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| 引用本文： | 顾卫国,王德忠,川口靖夫,张红霞.矩形槽道内表面活性剂减阻流体流场特性[J].力学学报,2010,42(2):312-318. |
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| 作者姓名： | 顾卫国 王德忠 川口靖夫 张红霞 |
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| 作者单位： | 上海交通大学机械与动力工程学院上海交通大学机械与动力工程学院东京理科大学理工学部机械工学科太原理工大学水利科学与工程学院 |
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| 摘 要： | 采用粒子图像测速仪对矩形槽道内表面活性减阻流体在流动方向(x方向)与壁面垂直方向(y方向)所在平面的流场进行了测量，分析了速度、涡量、速度脉动相关量在流场内的瞬态分布，以及对500幅相同工况的流场进行了统计平均. 结果显示: 与牛顿流体相比, 表面活性剂减阻流体接近于层流流动，横向速度脉动被大幅减弱，导致湍流输运减弱，雷诺应力远远小于水. 减阻流体流向速度脉动呈条带特征，沿流动方向发展，反映了减阻流体不同于水的湍流输运特征.
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| 关 键 词： | 表面活性剂 减阻流体 粒子图像测速仪 胶束 |
| 收稿时间： | 2008-07-17 |
Experimental study on the characteristics of ctac solution flow in the rectangular channel |
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| Institution: | School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaDepartment of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, Tokyo, JapanCollege of Water Conservancy Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | In the dilute surfactant drag-reducing flow, the slight viscoelasticity ofsolution affects the energy dissipation process of the flow, and this flowexhibits special fashion different from laminar flow or turbulent one inNewtonian fluid. The study on the modification of turbulent structures bythe viscoelasticity of the solution is important to clarify the dragreduction mechanism of surfactant solution flow. In this paper, dragreducing flow of dilute surfactant solution in the two dimensional rectanglechannel has been investigated experimentally. To grasp the instantaneousvelocity u-v in x-y plane, particle image velocimetry (PIV) is employed. Theexperiments pay attention to Reynolds number ranging from 10000 to40000 and concentration of additive CTAC (a kind of cationicsurfactants) from 25 to 100ppm on the flow.As for the additive CTAC concentration of 25, 40, 60 and 100ppm, the fanningfriction factor decreases and drag reduction (DR) increases with theincrease of mass concentration below the critical Reynolds number. Thesurfactant solution with 40ppm at Re=40000, compared with waterflow, shows DR of more than 70%.The instantaneous distribution of velocity, vorticity, and correlation ofvelocity fluctuation is analyzed. Statistics calculation is carried outbased on 500 velocity fields which are measured by PIV. The results exhibitthat the drag-reducing flow shows the approximate characteristics of thelaminar flow. The wall-normal velocity fluctuation of drag-reducing flow isdamped, which causes the decrease of turbulence transportation and Reynoldsshear stress comparing with the turbulent water flow. The streamwisevelocity fluctuation of drag-reducing flow shows the streamwise developedband-like distribution. This pattern indicates the new characteristic ofturbulence transportation in drag-reducing flow. |
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