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The equation is named after Henry Darcy and Julius Weisbach. Currently, there is no formula more accurate or universally applicable than the Darcy-Weisbach supplemented by the Moody diagram or Colebrook equation. [1] The Darcy–Weisbach equation contains a dimensionless friction factor, known as the Darcy friction factor. This is also ...
In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe.
Churchill equation [24] (1977) is the only equation that can be evaluated for very slow flow (Reynolds number < 1), but the Cheng (2008), [25] and Bellos et al. (2018) [8] equations also return an approximately correct value for friction factor in the laminar flow region (Reynolds number < 2300). All of the others are for transitional and ...
Bernoulli's equation; Bogoliubov–Born–Green–Kirkwood–Yvon hierarchy of equations; Bessel's differential equation; Boltzmann equation; Borda–Carnot equation; Burgers' equation; Darcy–Weisbach equation; Dirac equation. Dirac equation in the algebra of physical space; Dirac–Kähler equation; Doppler equations; Drake equation (aka ...
Darcy–Weisbach equation: Fluid dynamics: Henry Darcy and Julius Weisbach: Davey–Stewartson equation: Fluid dynamics: A. Davey and K. Stewartson: Debye–Hückel equation: Electrochemistry: Peter Debye and Erich Hückel: Degasperis–Procesi equation: Mathematical physics: Antonio Degasperis and M. Procesi: Dehn–Sommerville equations ...
As an answer to the first question, yes the Darcy–Weisbach equation is applicable to all flow types, turbulent, laminar, steady, and unsteady no matter the velocity or pressure distribution. As for the equation given for calculating the friction coefficient f for turbulent flow, it is completely incorrect or at least a very poor approximation ...
The shallow-water equations in unidirectional form are also called (de) Saint-Venant equations, after Adhémar Jean Claude Barré de Saint-Venant (see the related section below). The equations are derived [ 2 ] from depth-integrating the Navier–Stokes equations , in the case where the horizontal length scale is much greater than the vertical ...
Weisbach was the first to develop a method for solving orthogonal linear regression problems. [3] He examined the physics of steam engines, thermodynamics and mechanics. He took an interest in hydraulics and refined the Darcy equation into the still widely used Darcy–Weisbach equation. Gustav Zeuner (1828–1907) was one of his students. [3]