237 円管の助走区間における界面活性剤水溶液の流れ(G05-3 剥離制御・抵抗低減,G05 流体工学)  [in Japanese] 237 Developing Pipe Flow of Surfactant Solution  [in Japanese]

Developing pipe flow of surfactant solutions is investigated experimentally at surfactant concentrations below 100ppm. The rheological behavior of the surfactant solution is clarified based on measurements of the relationship between shear stress and shear rate, and the velocity distribution is investigated based on laser Doppler velocimetry measurements. The results indicate that a maximum drag reduction effect of 70% can be achieved by the addition of surfactant to water, and close to laminar flow can be achieved under drag-suppressed conditions. The velocity distribution under drag-suppressed flow is shown to approach that given by Virk's equation.