May 2009

Piping/Fluid Flow

New explicit friction factor equation for turbulent flow in rough pipes

It is more reliable and accurate than existing equations

Sasan-Amiri, A., Bouali Sina Petrochemical Company

Darcy-Weischbach introduced the basic equation (Eq. 1) to determine key parameters of a piping system design like pipe diameter, pressure drop and volumetric flowrate. In addition to fluid density and velocity and pipe length, friction factor, ƒ, estimation under laminar or turbulent flow in smooth or rough pipes is an important step to calculate the mentioned items accurately. Fig. 1 shows the Moody diagram that is used for ƒ graphical estimation both under laminar and turbulent flows for smooth and rough pipes. For laminar flow, ƒ values are easily determined from Fig. 1 or by Eq. 2 but, for turbulent flow, graphical estimation of ƒ values are highly dependent on the

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