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Development of a new instrument for direct skin friction measurementsA device developed for the direct measurement of wall shear stress generated by flows is described. Simple and symmetric in design with optional small moving mass and no internal friction, the features employed in the design eliminate most of the difficulties associated with the traditional floating element balances. The device is basically small and can be made in various sizes. Vibration problems associated with the floating element skin friction balances were found to be minimized due to the design symmetry and optional damping provided. The design eliminates or reduces the errors associated with conventional floating element devices: such as errors due to gaps, pressure gradient, acceleration, heat transfer, and temperature change. The instrument is equipped with various sensing systems and the output signal is a linear function of the wall shear stress. Dynamic measurements could be made in a limited range and measurements in liquids could be performed readily. Measurement made in the three different tunnels show excellent agreement with data obtained by the floating element devices and other techniques.
Document ID
19860016285
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Vakili, A. D. (Tennessee Univ. Space Inst. Tullahoma, TN, United States)
Wu, J. M. (Tennessee Univ. Space Inst. Tullahoma, TN, United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1986
Subject Category
Instrumentation And Photography
Report/Patent Number
UTSI-86-02
NASA-CR-176818
NAS 1.26:176818
Accession Number
86N25757
Funding Number(s)
CONTRACT_GRANT: NAG1-303
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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