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 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Online-Zugang: | Volltext |
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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. |
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ISSN: | 0098-2202 1528-901X |
DOI: | 10.1115/1.3129132 |