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## Darcy-Weisbach equation
The ## Additional recommended knowledgeThe equation was initially a variant on the Prony equation; this variant was developed by Henry Darcy of France, and further refined into the form used today by Julius Weisbach of Saxony in 1845: where the head loss due to friction - a Darcy friction factor,
*f* - the ratio of the length to diameter of the pipe,
*L/D* - the velocity of the flow,
*V* - the standard constant for acceleration due to gravity
*g*.
The equation can also be written in terms of pressure loss: where the pressure loss due to friction - the coefficient of laminar, or turbulent flow,
*λ* - the ratio of the length to diameter of the pipe,
*L/D* - the density of the fluid,
*ρ* - the velocity of the flow,
*V*
The pressure loss equation can be derived from the head loss equation by multiplying each side by ρ and g. This will demonstrate that λ and f are equivalent. The friction factor Methods for finding the friction factor |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Darcy-Weisbach_equation". A list of authors is available in Wikipedia. |