January 2007

Piping/Fluid Flow

Analytical calculation of Fanning friction factor

The Colebrook equation can be solved by using the Lambert W function. Algorithmic routines are also given to do the calculation

Nandakumar, V., Mangalore Refinery & Petrochemicals Ltd.

For any fluid flow calculation, estimating friction factor is an important step toward determining the pressure drop and hence, the design of pumping capacity, valve and pipe size, etc. From the vast published articles and references available, one can find many methods of estimating the pressure drop in the flow condition. The sources range from nomograms for specific fluids to generalized charts like Moody's, to empirical formulae. The process engineer routinely encounters the problems of liquid flow system design. Pump sizing is the most common example. Calculating the pressure drop in an incompressible fluid flow is one of the most active applications of fluid mechanics. The pressure d

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