界面活性剤水溶液の抵抗減少効果に関する研究（溶媒や添加剤が円管内流動に及ぼす影響）

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In this study, we experimentally investigated the effects of additives such as rust inhibitors, propylene glycol, coconut fatty acid, and potassium hydroxide on the drag reduction of a surfactant solution, Ethoquad O/12. To study the drag reduction mechanism, we measured the particle size distribution in test solutions using a dynamic light scattering spectrophotometer. The results demonstrated that 1250 ppm Ethoquad O/12 aqueous solution showed drag reduction by about 60% at a Reynolds number of 8000. Further, addition of rust inhibitors such as benzotriazole, amine salts, and tolyltriazole appeared to have little effect on the drag reduction. However, addition of propylene glycol to Ethoquad O/12 aqueous solution reduced the rate of drag reduction to about 50%. In contrast, addition of coconut fatty acid and potassium hydroxide resulted in the drag reduction effect disappearing altogether. Peak diameters of the particle distribution of 180 nm and 50 nm were observed in Ethoquad O/12 aqueous solution, which indicated the drag reduction effect. The peak diameters in the solution with added propylene glycol changed to 230 nm and 75 nm. In contrast, the peak diameters in the solutions with added coconut fatty acid and potassium hydroxide, which were without the drag reduction effect, changed to 17 nm and 5 nm—obviously very small particle sizes. Therefore, we conclude from the results that the drag reduction effect is closely related to a change in the particle size of a surfactant solution.

界面活性剤水溶液の抵抗減少効果に関する研究（溶媒や添加剤が円管内流動に及ぼす影響）

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