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Pipe Friction - Darcy-Weisbach

Pipe head-loss from Darcy-Weisbach equation - the fundamental pipe-friction calculation for any fluid system.

Darcy-WeisbachPipeHead loss
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Formula, assumptions, and limits

hf=fLDv22gh_f = f \cdot \frac{L}{D} \cdot \frac{v^2}{2g}
SymbolMeaningUnit
LLPipe lengthm
DDInside diameterm
vvMean velocitym/s
ffDarcy friction factor

Source: Moody L.F. - ASME 1944

In short

Pipe head-loss from Darcy-Weisbach equation - the fundamental pipe-friction calculation for any fluid system.

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