Experimental study of drag-reduction mechanism for a dilute surfactant solution flow
Experimental study of drag-reduction mechanism for a dilute surfactant solution flow
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稀表面活性剂溶液流减阻机理实验研究
DOI：
10.1016/j.ijheatmasstransfer.2007.04.048
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发表时间：
2008-02
影响因子：
5.2
通讯作者：
Li, Feng-Chen
中科院分区：
文献类型：
--
作者：
Hishida, Koichi;Yu, Bo;Kawaguchi, Yasuo;Wei, Jin-Jia;Li, Feng-Chen
对槽道湍流减阻前后涡结构和湍流事件的定量特征进行了实验研究。在30°C下测试浓度为25 ppm和75 ppm的CTAC（CTAC -十六烷基三甲基氯化铵）的减阻水溶液。采用粒子图像测速技术（PIV）测量了流动流向壁面法向面内的瞬时速度场。通过可视化瞬时矢量场、旋涡强度等值线图和uv瞬时值（u和v分别为流向和壁面法向速度脉动），量化了涡包的特征角。结果表明，CTAC减阻添加剂降低了近壁湍流猝发的强度和频率，涡结构和猝发的特征不仅与减阻水平有关，而且与添加剂浓度有关。从表征壁面湍流中湍流事件的量化参数出发，得到了fT与湍流事件的频率和强度的乘积成线性关系。
The quantitative characteristics of vortex structures and turbulent events in turbulent channel flows with and without drag reduction were investigated experimentally. Drag reducing aqueous solutions of CTAC (CTAC – cetyltrimethyl ammonium chloride) with concentration of 25ppm and 75ppm at 30°C were tested. Particle image velocimetry (PIV) was used to measure the instantaneous velocity field in the streamwise–wall-normal plane of the flow. Through visualizing the instantaneous vector fields, contour maps of the swirling strength and instantaneous value of uv (u and v are the streamwise and wall-normal velocity fluctuations, respectively), the characteristic angle of vortex packets was quantified. It was shown that the drag-reducing CTAC additive reduced both the strength and frequency of turbulent bursts near the wall, and the characteristics of vortex structures and bursts were not only dependent on drag-reduction level but also on concentration of additive. From the quantified parameters characterizing turbulent events in a wall-bounded turbulent flow, it was obtained that fTwas linearly proportional to the product of frequency and strength of turbulent events.
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影响因子：
3.7
作者：
CORINO, ER;BRODKEY, RS
通讯作者：
BRODKEY, RS
影响因子：
3.7
作者：
G. Donohue;W. G. Tiederman;M. Reischman
通讯作者：
G. Donohue;W. G. Tiederman;M. Reischman
影响因子：
3.5
作者：
Li Feng-chen;Y. Kawaguchi;K. Hishida;M. Oshima
通讯作者：
Li Feng-chen;Y. Kawaguchi;K. Hishida;M. Oshima
DOI：
10.1016/j.ijheatmasstransfer.2004.09.029
发表时间：
2005-02
影响因子：
5.2
作者：
Feng-chen Li;Y. Kawaguchi;K. Hishida
通讯作者：
Feng-chen Li;Y. Kawaguchi;K. Hishida
影响因子：
3.7
作者：
Y. Nagano;M. Tagawa
通讯作者：
Y. Nagano;M. Tagawa