The oil-film method of skin friction measurement, which does not require calibration, nevertheless entails that interferometric measurements of the oil film be obtained. The oil-film method is presently simplified by eliminating interferometry and its requisite polished surface, by taking direct and dynamic measurements of the oil-film slope with a small position-sensing photodiode. This technique has undergone verification in incompressible turbulent and laminar flows in flat-plate boundary layers and pipe flows; the meter is judged to be inexpensive, simple, and robust.
A simplified oil-film skin-friction meter
AIAA, ASME, SIAM, and APS, National Fluid Dynamics Congress ; 1988 ; Cincinnati, OH, United States
1988-01-01
Conference paper
No indication
English
A simplified oil-film skin-friction meter
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