A Novel Explicit Equation for Friction Factor in Smooth and Rough Pipes

In this paper, we propose a novel explicit equation for friction factor, which is valid for both smooth and rough wall turbulent flows in pipes and channels. The form of the proposed equation is based on a new logarithmic velocity profile and the model constants are obtained by using the experimenta...

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Veröffentlicht in:Journal of fluids engineering 2009-06, Vol.131 (6), p.4-4
Hauptverfasser: Avci, Atakan, Karagoz, Irfan
Format: Artikel
Sprache:eng
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Zusammenfassung:In this paper, we propose a novel explicit equation for friction factor, which is valid for both smooth and rough wall turbulent flows in pipes and channels. The form of the proposed equation is based on a new logarithmic velocity profile and the model constants are obtained by using the experimental data available in the literature. The proposed equation gives the friction factor explicitly as a function of Reynolds number and relative roughness. The results indicate that the present model gives a very good prediction of the friction factor and can reproduce the Colebrook equation and its Moody plot. Therefore, the new approximation for the friction factor provides a rational, accurate, and practically useful method over the entire range of the Moody chart in terms of Reynolds number and relative roughness.
ISSN:0098-2202
1528-901X
DOI:10.1115/1.3129132