Pressure power spectrum in high-Reynolds number wall-bounded flows

2020 ◽  
Vol 84 ◽  
pp. 108620 ◽  
Author(s):  
Haosen H.A. Xu ◽  
Aaron Towne ◽  
Xiang I.A. Yang ◽  
Ivan Marusic
Keyword(s):  
Reynolds Number ◽  
Power Spectrum ◽  
High Reynolds Number ◽  
Wall Bounded Flows ◽  
High Reynolds

Friction Factor Directly From Roughness Measurements

2001 ◽  
Author(s):  
Elling Sletfjerding ◽  
Jon Steinar Gudmundsson
Keyword(s):  
Reynolds Number ◽  
Pressure Drop ◽  
Power Spectrum ◽  
Friction Factor ◽  
High Reynolds Number ◽  
Gas Flow ◽  
Relative Roughness ◽  
High Reynolds ◽  
Friction Factor Correlation ◽  
Roughness Measurements

Abstract 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.

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