Spectra of Reynolds stresses in a developing pipe flow

One dimensional spectra of Reynolds stresses were measured for the first time to test the spectrum theory in the developing pipe flow. A -5/3 power law region was found for about a decade of wave numbers for u spectra but for a very small range for v and w spectra. Kolmogorov's theory of local isotropy was best found to be valid where the intermittent nature of the flow either internal or external, was not present in the flow field. The value of constant alpha needed for the evaluation of dissipation rate from spectra was generally found to be constant in the inertial subrange. The spectra results were not indicative of the nonasymptotic development of mean and turbulent field