抵抗低減界面活性剤水溶液流れの乱流遷移現象

概要

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It is known that small quantities of surfactant additives can greatly reduce the friction factors during the pipe flow. This is because the generation of turbulent vortices is suppressed by the formation of rod-like micelles, and the flow remains laminar in the high Reynolds number range. However, the turbulent transition process of the surfactant water solution has many unexplained points. It is important that we clarify the turbulent transition process of the surfactant solution flow to elucidate the mechanism of the drag reducing surfactant solution's flow. This paper describes the experimental results of the transition process of the surfactant solution. The experiment was carried out by using the LDV measurement and the differential pressure measurement. As a result, it was found that although the turbulent transition of the water flow occurred suddenly, that of the surfactant solution flow occurred little by little.