Skin friction gage for time-resolved measurements

Details Skin friction gage for time-resolved measurements Skin friction gage for time-resolved measurements

1983-03-10

1984-10-09

Swisher, S. Clement

Measuring and testing

Miscellaneous

73204, 374 54, G01K 300, G01D 2100

Patent

active

044753926

ABSTRACT:
A method and a gage for time-resolved skin-friction measurements. The gage is a composite structure comprised of a heated, flush-mounted, guard film and a hot wire mounted to an electrically insulated very low thermal conductivity material plug in the vicinity of the film and raised slightly above the plug surface. When the so constructed gage is calibrated in a laminar flow environment, it then has the ability to provide accurate readings of skin-friction in turbulent flow conditions.

REFERENCES:
patent: 4061029 (1977-12-01), Fletcher
patent: 4317102 (1982-02-01), Vranas
Liepmann et al., "Shearing-Stress Measurments by Use of a Heated _Element," National Advisory Committee of Aeronautics Technical _Note 3268 (1954).
Rubesin et al., "A Hot-Wire Surface Gage for Skin Friction and _Separation Detection Measurments," NASA Technical Memorandum _TM-X-62,465 (1975).
Brown, "Theory and Application of Heated Films for Skin Friction _Measurments," Proceedings of the 1967 Heat Transfer & Fluid _Mechanics Institute (1967).
Bellhouse et al. "Determination of Mean and Dynamic Skin Friction, _Separation and Transition in Low-Speed Flow with a Thin-Film _Heated Element," J. Fluid Mech. (1966).
Bradshaw et al. "The Determination of Local Turbulent Skin Friction _from Observation in the Viscous Sub-Layer," Aeronautical Research _Council, Reports and Memorandum No. 3202 (1959).
Bellhouse et al. "The Measurement of Fluctuating Skin Friction in Air With Heated Thin-Film Gauges," J.Fluid Mech. (1968).

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