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A new approximate expression for the response of a hot-wire anemometer

Published online by Cambridge University Press:  21 April 2006

Michio Nishioka  and
Masahito Asai
Michio Nishioka
Affiliation:
Department of Aeronautical Engineering, University of Osaka Prefecture, Sakai, Osaka, 591 Japan
Masahito Asai
Affiliation:
Department of Aeronautical Engineering, University of Osaka Prefecture, Sakai, Osaka, 591 Japan
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Abstract

Bruun's (tabulated) universal function for the response of a hot-wire anemometer is examined in detail to see if the function has some unique relationship with King's law. As a result of the analysis, an approximate expression is derived and proposed for the response over a wide range of wind speeds. Although the expression is like King's law with an additional correction term and is thus quite simple in form, it agrees with Bruun's universal function (and also with the derivative, i.e. the velocity sensitivity) to within 3% over the range of wind speeds from 2 to 120 m/s. There is little doubt that the proposed response equation may serve as a helpful guide in calibrating a hot-wire probe, in constructing a simple linearizer circuit of high accuracy, and in linearization by means of a computer.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 190 , May 1988 , pp. 113 - 119
Copyright
© 1988 Cambridge University Press

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References

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