The correlation is given byĭang and Hihara (2004) and Son and Park (2006) presented a comparison of their measured pressure drops to the Blasius equation. (2011), the Filonenko (1954) correlation is a good approximation of the Colebrook equation for smooth tubes in the range of 10 4 < Re ≤ 10 8. A review and assessment of the explicit friction factor correlations can be found in Chen (1979), Yildirim (2009), Brkic (2011), Genic et al. To overcome this issue, explicit forms of the Colebrook and Nikuradse friction factor correlations are proposed by various authors ( Selander, 1978 Chen, 1979 Goudar and Sonnad, 2003 and several others). Therefore, an iterative procedure is required while calculating the friction factor by these equations which is not desirable for use in computer codes as it increases the computational time. Note that friction factor appears on the LHS as well as RHS of Eqs. This equation is the basis of the Moody’s chart commonly used for estimation of the friction factor and is valid in the transition and fully developed turbulent flow regimes for both smooth and rough tubes.
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