Discussion of “Accurate and Efficient Explicit Approximations of the Colebrook Flow Friction Equation Based on the Wright ?-Function” by DejanBrki?; and Pavel Praks, Mathematics 2019, 7, 34; doi:10.3390/math7010034

Lotfi Zeghadnia, Bachir Achour and Jean Loup Robert
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Lotfi Zeghadnia: Laboratory of Water and Environmental Sciences, Messadia Med Cherif University, Souk Ahras 41000, Algeria
Bachir Achour: Research Laboratory in Subterranean and Surface Hydraulics (LARHYSS), University of Biskra, PO Box 145, Biskra 07000, Algeria
Jean Loup Robert: Department of Civil Engineering, Faculty of Science and Engineering, University of Laval, Quebec, QC G1V 0A6, Canada

Mathematics, 2019, vol. 7, issue 3, 1-7

Abstract: The Colebrook-White equation is often used for calculation of the friction factor in turbulent regimes; it has succeeded in attracting a great deal of attention from researchers. The Colebrook–White equation is a complex equation where the computation of the friction factor is not direct, and there is a need for trial-error methods or graphical solutions; on the other hand, several researchers have attempted to alter the Colebrook-White equation by explicit formulas with the hope of achieving zero-percent (0%) maximum deviation, among them Dejan Brki? and Pavel Praks. The goal of this paper is to discuss the results proposed by the authors in their paper:” Accurate and Efficient Explicit Approximations of the Colebrook Flow Friction Equation Based on the Wright ?-Function” and to propose more accurate formulas.

Keywords: friction factor; explicit solutions; moody diagram; maximum deviation; turbulent flow (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2019
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