The four portions of the Moody diagram are: Such equations are shown in the box at the left, giving the relationships between Moody friction factor and Re & e/D for four different portions of the Moody diagram. The Moody Diagram at the right shows the nature of the dependence of the friction factor, f, on Re and e/D.Įquations for f as a function of Re and e/D would be more convenient than a graph like the Moody Diagram for use with Excel spreadsheets making pipe flow calculations with the Darcy Weisbach equation. The Reynolds number for the flow ( Re ) and the relative roughness of the pipe ( e/D ) are needed to get a value for the friction factor, f. The Darcy Weisbach equation is h L = f(L/D)(V 2 /2g ), with the parameters in the equation as follows: h L is the frictional head loss for flow of a fluid at average velocity, V, through a pipe of length, L, and diameter, D. A Friction Factor Calculator and the Darcy Weisbach Equation Any one of these can be calculated if the others are known along with the density and viscosity of the fluid. The Darcy Weisbach equation provides the relationship among the following parameters: pipe diameter and length, pipe flow rate, and frictional pressure drop or head loss. The Darcy Weisbach equation is applicable to pressure flow in pipes, rather than gravity flow (as in sewer pipes), which is handled by open channel flow equations like the Manning equation. Why read values from a Moody diagram, make iterative calculations to get friction factor, or use online calculators, when you can get a pipe flow-friction factor calculator Excel Spreadsheet for only $19.95? Read on for information about the Darcy Weisbach equation and its use in an Excel spreadsheet as a friction factor/pipe flow calculator.Įxcel spreadsheets are very convenient for Darcy Weisbach equation/pipe flow calculations, such as frictional pressure drop calculation or use of a friction factor calculator, at least in part because some of the calculations require iterative solutions. Where to Find a Pipe Flow-Friction Factor Calculator Excel Spreadsheetįor a pipe flow-friction factor calculator Excel Spreadsheet, c lick here to visit our spreadsheet store.
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