2021 Volume 21 Issue 6 Pages 235-240
When small portion of surfactant which forms thread-like micelle is added in turbulent flow, drag reduction is occurred and may provide significant savings for electric power. As for screening of the surfactant for the drag reduction, vortex inhibition and viscoelastic recoil were used. While, in oil solution, such as cyclohexane or heptane, reverse thread-like micelle by cationic gemini surfactants was stabilized by small portion of water as matrix and was succeeded in the oil gelation. The reverse thread-like oil solution also showed the vortex inhibition and viscoelastic recoil.