Abstract
The low-speed streaks occurring in the near wall region of a turbulent boundary layer have been studied by means of two nonintrusive experimental techniques: the electrochemical method for the wall shear stress measurements, and the Laser Doppler Anemometer (LDA) for the velocity measurements. Correlations between the wall shear stress simultaneously measured at several points in the spanwise direction, and the correlations between the velocity and the wall shear stress simultaneously measured, indicate that in the near-wall region y +<10 the dimensionless spanwise streak spacing is nearly constant with a value of λ +=110 and increases with distance from the wall for y +>10. These correlations also show the presence of a double-peak in the correlation curves indicating the existence of structures ±6° tilted in ( x, z) plane.
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