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Preston tube calibrations and direct force floating element measurements in a two-dimensional turbulent boundary layerPreston tubes provide a convenient means of estimating local wall shear stress. Practical difficulties arise from a lack of calibration data obtained in turbulent boundary layer flows and from the wide choice of calibration equations available mainly from pipe flow calibrations. The results of an experimental study comparing a large number of direct force local wall shear stress measurements in a near-zero pressure gradient two-dimensional turbulent boundary layer flow are presented. The results indicate that there is consistent and excellent agreement between the Patel intermediate calibration formula and the direct force measurements. Typical differences among the direct force measurements and several other proposed calibration equations are also shown.
Document ID
19820051349
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mcallister, J. E.
(Du Pont de Nemours (E. I.) and Co. Aiken, SC, United States)
Tennant, M. H.
(Du Pont de Nemours Savannah River Laboratory Aiken, SC, United States)
Pierce, F. J.
(Virginia Polytechnic Institute and State University Blacksburg, VA, United States)
Date Acquired
August 10, 2013
Publication Date
June 1, 1982
Subject Category
Instrumentation And Photography
Accession Number
82A34884
Funding Number(s)
CONTRACT_GRANT: NSG-2301
Distribution Limits
Public
Copyright
Other

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