An estimate of the low wavenumber component of surface turbulence shear stress as a function of frequency has been obtained through measurements of the correlations of the longitudinal component of turbulence velocity made close to the surface at y +=7. The data were acquired in a fully-developed turbulent pipe flow at a Reynolds number (based on centreline velocity and pipe diameter) of 268000, using two single hot-wire anemometer probes. A novel data analysis procedure has been introduced to establish the accuracy limits of the low wavenumber turbulence energy estimate for frequencies in the similarity regime of wall turbulence and the results are compared with other measurement techniques.
Experiments in Fluids – Springer Journals
Published: Nov 19, 1997
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