Abstract
Surfactant additives have been attractive as practical drag-reducing additives because they were not affected by the degradation due to mechanical shear action and they could apply to the circulatory system. There are only a few studies on the turbulent boundary layer flow of surfactant solutions, although a lot of studies for turbulent channel flow and pipe flow have been performed so far. The influence of drag-reducing surfactant solution on a turbulent boundary layer was investigated using a LDV system. LDV measurements were made for surfactant solutions of 65 ppm and 100 ppm. We compared turbulence statistics between water and surfactant solutions for understanding the detailed drag-reducing mechanism.
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