Darcy-Weisbach equation

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Darcy-Weisbach equation

[¦där·sē ′vīs‚bäk i‚kwā·zhən]
(fluid mechanics)
An equation for the loss of head due to friction hf during turbulent flow of a fluid through a duct of any shape; in the case of a circular pipe, hf = f (L/d)(V 2/2 g), where L and d are the length and diameter of the pipe, V is the fluid velocity, g the acceleration of gravity, and f a dimensionless number called Darcy number 1.