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Shearing-Stress Measurements by use of a Heated Element

Liepmann, H. W. and Skinner, G. T. (1954) Shearing-Stress Measurements by use of a Heated Element. National Advisory Committee for Aeronautics , Washington, D. C..

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The rate of local heat transfer from a solid surface to a moving fluid is related to the local skin frinction. Measurements of the heat transmission from small elements embedded in the surface of a solid can thus be used to botain local skin-friction coefficients. This method was applied by Fage and Falkner for laminar boundary layers and by Ludwieg for turbulent boundary layers. The present report discussed the possible range of application of such an instrument in low- and high-speed flow and presents experimental data to show that a very simple instrument can be used to obtain laminar and turbulent skin-friction coefficients with a single calibration. The instrument consists of an ordinary hot-wire cemented into a groove in the surface. The heat loss from the wire is proportional to the cube root of the wall shearing stress, and the constant of proportionality may be found by one calibration, for example, in laminar flow.

Item Type:Report or Paper (Technical Report)
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Record Number:CaltechAUTHORS:LIEnacatn3268
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:444
Deposited By: Archive Administrator
Deposited On:20 Jun 2005
Last Modified:02 Oct 2019 22:33

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