TURBULENCE MEASUREMENTS OF DRAG-REDUCING SURFACTANT SYSTEMS

LDA measurements were made of mean velocity and of turbulence intensit y in a 39.4 mm diameter tube, the first measurements in three directio ns on drag reducing surfactant solutions (0.05% and 0.1% Habon G). Dra g reduction exceeded the predictions of the Virk maximum drag reductio n asymptote and elastic sublayer mean velocity profiles are steeper th an the profile proposed by Virk for maximum drag reducing asymptote so lutions. Axial turbulence intensities for Habon G solutions are higher than those for water near the wall, lower in most of the outer region and about the same at the center. Tangential and radial turbulence in tensities are lower than those for water.