An experimental investigation has been carried out to document and relate the frictional resistance and roughness texture of painted surfaces smoothed by sanding. Hydrodynamic tests were carried out in a towing tank using a flat plate test fixture towed at a Reynolds number range of based on the plate length and freestream velocity. Results indicate an increase in frictional resistance coefficient of up to 7.3% for an unsanded, as-sprayed paint surface compared to a sanded, polished surface. Significant increases in were also noted on surfaces sanded with sandpaper as fine as 600-grit as compared to the polished surface. The results show that, for the present surfaces, the centerline average height is sufficient to explain a large majority of the variance in the roughness function in this Reynolds number range.
The Relationship Between Frictional Resistance and Roughness for Surfaces Smoothed by Sanding
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division August 14, 2001; revised manuscript received December 31, 2001. Associate Editor: T. Gatski.
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Schultz, M. P. (May 28, 2002). "The Relationship Between Frictional Resistance and Roughness for Surfaces Smoothed by Sanding ." ASME. J. Fluids Eng. June 2002; 124(2): 492–499. https://doi.org/10.1115/1.1459073
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