Drag Reduction for a Rotating Disk in Surfactant Solutions.
Drag Reduction for a Rotating Disk in Surfactant Solutions.
复制标题
表面活性剂溶液中旋转盘的减阻。
DOI：
10.1299/kikaib.66.651_2899
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Keizo Watanabe
中科院分区：
文献类型：
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作者：
S. Ogata;Keizo Watanabe
最近，人们对用于区域加热和冷却系统以降低泵送能量需求的表面活性剂添加剂产生了相当大的兴趣。在这项研究中，在表面活性剂溶液中的封闭旋转盘的减阻实验澄清。进行了实验以测量作用在盘的一侧上的扭矩。测试表面活性剂溶液是具有水杨酸钠的Ethoquad O/12，浓度为50、100和200 ppm。测试溶液的温度为18、25和31°C。结果表明，表面活性剂溶液的减阻效果不仅与浓度有关，还与温度有关。流动显示技术表明，表面活性剂溶液降低了旋转圆盘周围的圆形涡的振幅，并使圆盘附近的流动方向转向外侧。在200 ppm Ethoquad O/12溶液中，当Re=5×105时，最大减阻率约为30%。
Recently, Considerable interest has developed in surfactant additives for use in district heating and cooling systems to lower pumping energy requirement. In this study, drag reduction for an enclosed rotating disk in surfactant solutions was clarified experimentally. Experiments were carried out to measure the torque of acting on one side of the disk. Test surfactant solutions were Ethoquad O/12 with sodium salicylate at concentration of 50, 100 and 200 ppm. The temperature of test solutions were 18, 25 and 31°C. It was shown that the drag reduction of the surfactant solutions was not only depended on the concentration but also on the temperature. From flow visualization technique, it has been clarified that the amplitude of circular vortices around the rotating disk were reduced by the surfactant solution and the flow direction near the disk was turned to outward. The maximum drag reduction ratio was about 30% in 200 ppm Ethoquad O/12 solution at about Re=5×105.