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

Author:

Avci Atakan1,Karagoz Irfan1

Affiliation:

1. Department of Mechanical Engineering, Uludag University, 16059 Bursa, Turkey

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering

Reference23 articles.

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4. Nikuradse, J. , 1932, “Laws of Turbulent Flow in Smooth Pipes,” NASA, Report No. TT F-10.

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