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The determination of fluctuating velocity in air with heated thin film gauges

Published online by Cambridge University Press:  28 March 2006

B. J. Bellhouse  and
D. L. Schultz
B. J. Bellhouse
Affiliation:
Department of Engineering Science, University of Oxford
D. L. Schultz
Affiliation:
Department of Engineering Science, University of Oxford
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Abstract

When attempts are made to use thin film anemometers in airflow to measure fluctuating velocity it is found that the dynamic sensitivity cannot be obtained from a steady-flow calibration. It is found that the dynamic sensitivity is considerably less than that predicted by static calibration and that the sensitivity is frequency-dependent. It is shown that thermal feedback from the substrate, on which the gauge is mounted, to the heated element is responsible for the variation of sensitivity with frequency, despite constant-temperature operation of the probe, and this variation is examined theoretically and experimentally.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 29 , Issue 2 , 11 August 1967 , pp. 289 - 295
Copyright
© 1967 Cambridge University Press

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References

Bankoff, S. G. & Rosler, R. S. 1962 Constant-temperature hot-film anemometer as a tool in liquid turbulence measurements Rev. Sci. Instrum. 33, 1209–12.Google Scholar
Bellhouse, B. J. & Schultz, D. L. 1966 Determination of mean and dynamic skin friction, separation and transition in low-speed flow with a thin-film heated element J. Fluid Mech. 24, 379–400.Google Scholar
Curle, N. 1962 The Laminar Boundary Layer Equations. Oxford Mathematical Monographs.