Drag-reducing effect of nonionic surfactant solutions

被引：0

作者：

Tamano, Shinji ^{[1
]}

Itoh, Motoyuki ^{[1
]}

Kato, Katsuo ^{[1
]}

Yokota, Kazuhiko ^{[1
]}

机构：

[1] Graduate School of Engineering, Nagoya Institute of Technology, Showa-ku, Nagoya-shi, Aichi, 466-8555, Gokiso-cho

来源：

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | 2009年 / 75卷 / 756期

关键词：

Boundary layer; Drag reduction; Flow control; LDV; Non-newtonian fluid; Nonionic surfactant; PIV; Turbulent flow;

D O I：

10.1299/kikaib.75.756_1598

中图分类号：

学科分类号：

摘要：

There are a few studies on the drag-reducing effect of nonionic surfactant solutions which are nontoxic and biodegradable, while a lot of investigations for cationic surfactant solution have been performed so far. First, the drag-reducing effects of nonionic surfactant solutions such as oleyl-dimethylamineoxide (ODMAO) and alkyl polyglycoside (APG) were investigated by measuring the pressure drop in the pipe flow. Second, we investigated the drag-reducing effect of a nonionic surfactant on the turbulent boundary layer using a two-component laser-Doppler velocimetry (LDV) and particle image velocimetry (PIV) systems. At the temperature of nonionic surfactant solutions T=25°C, the maximum drag reduction ratios for ODMAO 500 ppm and APG 6 000 ppm were about 50% and 15%, respectively, in the boundary layer flow, although the drag reduction ratio for both surfactant solution was larger than 60% in pipe flow. Turbulence statistics and structures for ODMAO 500 ppm showed the behavior of typical dragreducing flow such as suppression of turbulence and modification of near-wall vortices, while velocity fields for APG 6 000 ppm were similar to those of water.

引用

页码：1598 / 1607

页数：9

共 24 条

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