Abstract
The present experiment is conducted to examine the shear-induced structure of surfactant solutions in the flow around a single cylinder in the Reynolds number range from 100 to 2000. We perform flow visualizations and velocity measurement. It is found that the wake region behind a cylinder becomes small as the Reynolds number is beyond a certain value, which depends on the cylinder diameter. The build-up of the shear-induced structure is suggested to take place a critical shear rate from 10 to 18 s^<-1> in spite of the cylinder diameter.
