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In fluid dynamics, the Darcy friction factor formulae are equations that allow the calculation of the Darcy friction factor, a dimensionless quantity used in the Darcy–Weisbach equation, for the description of friction losses in pipe flow as well as open-channel flow.
μ is the dynamic viscosity of the fluid (Pa·s = N·s/m 2 = kg/(m·s)); Q is the volumetric flow rate, used here to measure flow instead of mean velocity according to Q = π / 4 D c 2 <v> (m 3 /s). Note that this laminar form of Darcy–Weisbach is equivalent to the Hagen–Poiseuille equation, which is analytically derived from the ...
It adapts the work of Hunter Rouse [2] but uses the more practical choice of coordinates employed by R. J. S. Pigott, [3] whose work was based upon an analysis of some 10,000 experiments from various sources. [4] Measurements of fluid flow in artificially roughened pipes by J. Nikuradse [5] were at the time too recent to include in Pigott's chart.
The Darcy-Weisbach equation can be used equivalently with either the fanning friction factor or the Darcy Weisbach friction factor, however if the fanning factor is used the diameter D in the equation must be replaced with the hydraulic radius.74.60.57.253 04:16, 4 November 2009 (UTC)
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Reach him at fernando.cervantes@gannett.com and follow him on X @fern_cerv_. This article originally appeared on USA TODAY: 16-year-old New Mexico teen accused of killing mom, dad and siblings.
1944 – Lewis Ferry Moody plots Darcy–Weisbach friction factor against Reynolds number for various values of relative roughness, leading to the first Moody chart. [1] 1961 – Eugene P. Gross [62] and Lev Pitaevskii [63] introduce Gross–Pitaevskii equation for the condensation of bosons.
December 19, 2024 at 5:14 AM. By Marta Fiorin. BRUSSELS (Reuters) - Belgium will in January become the first European Union country to ban sales of disposable vapes because of concerns about their ...