Turbulent drag reduction due to surfactant solutions was investigated for a small-scale pipeline system composed complex elements. The effects of the counter-ion concentration were discussed on the drag reduction, the viscoelastic characteristics, and the vortex inhibition. When the molar concentration of the counter-ion was ten times higher than that of the surfactant, the drag reduction appeared over the wide range of the surfactant concentration. This combination of counter-ion and surfactant exhibited a modest increase in viscosity, and the vortex inhibition appeared at a high stretching rate.
Drag Reduction in a Small-Scale Circulation System of Surfactant Solutions
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Tominaga, S, & Mizunuma, H. "Drag Reduction in a Small-Scale Circulation System of Surfactant Solutions." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 1: Symposia, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 285-289. ASME. https://doi.org/10.1115/FEDSM2007-37184
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