Abstract
Two points velocity measurements in a fully developed turbulent duct flow are performed using LDA technique. Color separation is used to discriminate signals from close positions. High spatial (about 0.1 mm) and temporal (about 10<SUP>-3</SUP> s) resolutions are obtained by careful selection of optical and electronic parameters. The signals are analyzed using classical auto-correlation and power spectral functions, but also time cross-correlation, transfer and coherence functions. From time-space quantities, information on the evolution in a reference frame moving with the mean flow velocity can be derived and compared with Lagrangian correlation; the results agree at least over one integral time scale. Different Reynolds numbers are tested. Taylor and advection hypotheses are also investigated.
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