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Pipe flow measurements of turbulence and ambiguity using laser-Doppler velocimetry

Published online by Cambridge University Press:  29 March 2006

N. S. Berman  and
J. W. Dunning
N. S. Berman
Affiliation:
School of Engineering, Arizona State University, Tempe
J. W. Dunning
Affiliation:
N.A.S.A. Lewis Research Center, Cleveland, Ohio
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Abstract

The laser-Doppler ambiguities predicted by George & Lumley have been verified experimentally for turbulent pipe flows. Experiments were performed at Reynolds numbers from 5000 to 15000 at the centre-line and near the wall. Ambiguity levels were measured from power spectral densities of FM demodulated laser signals and compared with calculations based on the theory. The turbulent spectra for these water flows after accounting for the ambiguity were equivalent to hot-film measurements at similar Reynolds numbers. The feasibility of laser-Doppler measurements very close to the wall in shear flows is demonstrated.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 61 , Issue 2 , 6 November 1973 , pp. 289 - 299
Copyright
© 1973 Cambridge University Press

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