Diffusion of slot injected drag-reducing polymer solution in a LEBU modified turbulent boundary layer

摘要: The effects of a tandem set large eddy breakup (LEBU) devices on the diffusion drag-reducing polymer solution and water injected into turbulent boundary layer flow have been studied. Laser Doppler velocimeter measurements were taken in LEBU modified with without injection. A laser-induced fluorescence technique was used to examine development concentration profiles fluids increasing distance from injection slot for range rates. rate water, passive contaminant, diminished by over only 10 15 thicknesses before returning case an unmodified flow; whereas did major effect entire streamwise studied compared flow. Large reductions normal shear stresses observed downstream devices, especially