January 2010


New explicit friction factor equation for turbulent flow in smooth pipes

A simple, explicit and high-accuracy equation is presented

Sasan-Amiri, A., Bouali Sina Petrochemical Company

Calculating the "ƒ" factor is an essential step with piping systems for laminar and turbulent flows in smooth or rough pipes. The "Moody diagram" is the most widely accepted graphical method for determining ƒ factor but there are also many equations for this purpose. Eqs. 1, 2 and 3 are used for ƒ calculation for "laminar flow in pipes," "turbulent flow in rough pipes" and "turbulent flow in smooth pipes" respectively.   The last two equations are very accurate but have the disadvantage of being implicit in ƒ that need an iterative estimation method hence, considerable effort has been expended to introduce an explicit equation to determine

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