K-1216 界面活性剤水溶液の円柱の抵抗減少効果に関する研究(S17-4 抵抗減少効果)(S17 非ニュートン流体の複雑流路内の流れ)

概要

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The flow around a circular cylinder in surfactant solution was investigated experimentally by measuring the pressure distribution. Test surfactant solutions were Ethoquad O/12 at concentrations of 50, 100 and 200 ppm, and sodium salicylate was added as counterion. It was clarified that the pressure coefficient behind separation point around a circular cylinder in surfactant solution was larger than that in tap water, and the separation angle was increased with increasing the concentration of surfactant solutions. The drag coefficient of a circular cylinder in surfactant solution was smaller than that in tap water in the Reynolds number range of 10000 < Re < 50000, and no drag reduction occurred at Re=6000. The drag reduction ratio was increased with increasing the concentrations of surfactant solutions. The maximum drag reduction ratio was about 35%.
一般社団法人日本機械学会の論文
2001-08-22