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Measurement of fluid turbulence based on pulsed ultrasound techniques. Part 2. Experimental investigation

Published online by Cambridge University Press:  20 April 2006

Joseph L. Garbini ,
Fred K. Forster  and
Jens E. Jorgensen
Joseph L. Garbini
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, U.S.A.
Fred K. Forster
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, U.S.A.
Jens E. Jorgensen
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, U.S.A.
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Abstract

An extensive experimental programme in both laminar and turbulent flow was undertaken to examine the validity of all of the major implications of the model of the pulsed ultrasonic Doppler velocimeter for turbulent flow developed in part 1 of this investigation. The turbulence measurements were made in fully developed flow at the centre of a 6·28 cm diameter pipe. The Reynolds number of the flow ranged from 6000 to 40000. The carrier frequency of the ultrasonic velocimeter was 4·7 MHz.

Measurements of the turbulence intensity and of the one-dimensional velocity spectra made with the ultrasonic velocimeter are compared with the analysis and with the actual quantities as measured by a hot-film anemometer. The experimental results are in agreement with theoretical predictions.

Measurements of one-dimensional turbulence spectra with reduced ambiguity spectra made by the two sample volume methods described in part 1 are presented. The results verify the analysis and indicate that an improvement in the useful dynamic range of the velocity power spectrum of nearly three orders of magnitude can realistically be achieved.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 118 , May 1982 , pp. 471 - 505
Copyright
© 1982 Cambridge University Press

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