Abstract
Three indirect methods of measuring skin friction (Preston tube, sublayer fence, and wall pulsed wire) were compared with a direct method (floating-element balance) in a boundary layer with a strong adverse pressure gradient. In one case skin-friction measurements were performed in a boundary layer with separation and reattachment. Agreement between the three methods and the balance was satisfactory, with differences between the indirect methods and the balance reading high in regions with a strong decrease of τ w and low where τ w increased in streamwise direction. There existed a tendency of the differences to increase with increasing h +, but no general correlation with h + could be found.
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Gasser, D., Thomann, H. & Dengel, P. Comparison of four methods to measure wall shear stress in a turbulent boundary layer with separation. Experiments in Fluids 15, 27–32 (1993). https://doi.org/10.1007/BF00195592
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DOI: https://doi.org/10.1007/BF00195592