Pressure drop experiments on natural gas flow in 150 mm pipes at 80 to 120 bar pressure and high Reynolds number were carried out for pipes smooth to rough surfaces. The roughness was measured with an accurate stylus instrument and analyzed using fractal methods. Using a similar approach to that of Nikuradse the measured friction factor was related to the measured roughness values. Taking the value of the relative roughness and dividing it by the slope of the power spectrum of the measured roughness, a greatly improved fit with the measured friction factor was obtained. Indeed, a new friction factor correlation was obtained, but now formulated in terms of direct measurement of roughness.
Friction Factor Directly From Roughness Measurements
Contributed by the Petroleum Division for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received by the Petroleum Division; April 2001; revised manuscript received December 2002. Associate Editor: J. Keska.
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Sletfjerding, E., and Gudmundsson, J. S. (June 4, 2003). "Friction Factor Directly From Roughness Measurements ." ASME. J. Energy Resour. Technol. June 2003; 125(2): 126–130. https://doi.org/10.1115/1.1576264
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