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The use of flush-mounted hot-film gauges to measure skin friction in unsteady boundary layers

Published online by Cambridge University Press:  21 April 2006

A. N. Menendez  and
B. R. Ramaprian
A. N. Menendez
Affiliation:
Laboratorio de Hidraulica Applicada, INCYTH. Buenos Aires, Argentina
B. R. Ramaprian
Affiliation:
Department of Mechanical Engineering and Institute of Hydraulic Research. The University of Iowa, Iowa City, Iowa 52242 Current address: Department of Mechanical Engineering, Washington State University, Pullman, Washington 99164-2920.
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Abstract

Flush-mounted hot-film gauges have proved very effective in measuring skin friction in steady laminar and turbulent boundary-layer flows. Their use is based on the analogy between momentum and heat transfer in the boundary layer. An extension of this technique for use with unsteady flows is presented, through the formulation of a more general relationship between the rates of heat and momentum transfer at the wall. The accuracy of the new formula and the range of its applicability are examined for the case of a periodic boundary layer, both in the laminar and turbulent regimes. This is accomplished by comparing the formula against exact numerical solutions of the differential equations. The present extension allows one to apply the hot-film technique to general unsteady-flow situations, including the measurement of the spectral density of wall-shear-stress fluctuations in steady turbulent flows.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 161 , December 1985 , pp. 139 - 159
Copyright
© 1985 Cambridge University Press

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