# 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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
m--exponent of velocity or flow rate for a particular formula of head loss (m = 1 for laminar flow and m = 2 for full turbulent flow in the Darcy-Weisbach equation); and,
The pump head calculations, including piping, all fittings, valves, and devices, are achieved by using the Darcy-Weisbach equation with given flow parameters.
The pipeline model is a closed loop comprised of two volumes of half the total pipeline volume connected to the compressor and a flow resistance [DELTA]p characterized by the Darcy-Weisbach equation:
The most complicate is to evaluate friction coefficient [[xi].sub.2] which could be calculated with Darcy-Weisbach equation :
Pressure drop caused by the friction of a fluid flowing in a pipe may be described by the Darcy-Weisbach equation (1):
The Darcy-Weisbach equation for pressure drop in a pipe is:
The inherent resistance of the test rig, which corresponded well to the Darcy-Weisbach Equation for flow in a smooth tube, was subtracted from the measured data.
A new explicit equation for the friction coefficient in the Darcy-Weisbach equation. In: Proceedings of the Tenth Conference on Protection and Restoration of the Environment, v.
(A flow of 6 cfm [2.8 L/s] was used because the graphic scales best with such a value.) The actual pressure drop is calculated in Column H using the Darcy-Weisbach equation, converted to inches of water.
The resistance corresponded well to the Darcy-Weisbach equation for the whole flow range examined, and the additional resistance was subtracted from the total measured media resistance.
Using the f calculated by the Blasius equation, associated with the Darcy-Weisbach equation, this exponent is equal to 1.75.
The pressure drop can be estimated using the Darcy-Weisbach equation for turbulent flow in pipes.
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