Abstract
The preferred mode of a tube jet, characterized by the Strouhal number, has been deduced from measurements of the frequency spectra of the streamwise turbulent velocity. The different tubes with length/diameter ratios of 576, 1152, and 2034 were used, and a range of Reynolds number from 200 to 20,000 was covered. For a fully developed laminar exit condition, the preferred Strouhal number increases with Reynolds number, while for a fully developed turbulent exit condition, the Strouhal number is virtually independent of Reynolds number and attains a value of about 0.4 at the end of the turbulent core.
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