Preston Tube Calibrations and Direct Force Floating Element Measurements in a Two-Dimensional Turbulent Boundary Layer

Autor:	F. J. Pierce, J. E. McAllister, M. H. Tennant
Rok vydání:	1982
Předmět:	Physics Mechanical Engineering Pitot tube Mechanics Flow measurement law.invention Pipe flow Physics::Fluid Dynamics Stress (mechanics) Boundary layer Classical mechanics law Shear stress Calibration Pressure gradient
Zdroj:	Journal of Fluids Engineering. 104:156-160
ISSN:	1528-901X 0098-2202
DOI:	10.1115/1.3241795
Popis:	Preston 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.
Databáze:	OpenAIRE
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