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  2. Darcy–Weisbach equation - Wikipedia

    en.wikipedia.org/wiki/DarcyWeisbach_equation

    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 ...

  3. Darcy friction factor formulae - Wikipedia

    en.wikipedia.org/wiki/Darcy_friction_factor_formulae

    [2] [3] The equation can be used to (iteratively) solve for the Darcy–Weisbach friction factor f. For a conduit flowing completely full of fluid at Reynolds numbers greater than 4000, it is expressed as:

  4. Darcy's law - Wikipedia

    en.wikipedia.org/wiki/Darcy's_law

    Diagram showing definitions and directions for Darcy's law. A is the cross sectional area (m 2) of the cylinder. Q is the flow rate (m 3 /s) of the fluid flowing through the area A. The flux of fluid through A is q = Q/A. L is the length of the cylinder. Δp = p outlet - p inlet = p b - p a.

  5. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    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. It can be used to predict pressure drop or flow rate down such a pipe.

  6. Talk:Darcy–Weisbach equation - Wikipedia

    en.wikipedia.org/wiki/Talk:DarcyWeisbach_equation

    It contains a part that is solidly grounded in theory (the v^2/2g term, and to a lesser extent the L/D term) and the term "semi-empirical equation" is in more common use than "phenomenological equation"Mikejens 16:06, 12 November 2008 (UTC) The Darcy–Weisbach equation is exact for laminar flow and can be derived theoretically.

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  8. ΔP - Wikipedia

    en.wikipedia.org/wiki/ΔP

    1.1 Darcy–Weisbach equation. 1.2 Lung compliance. 1.2.1 Dynamic ... P plat is never > PIP and is typically < 3-5 cmH 2 O lower than PIP when airway resistance is ...

  9. Henry Darcy - Wikipedia

    en.wikipedia.org/wiki/Henry_Darcy

    During this period he modified the Prony equation for calculating head loss due to friction, which after further modification by Julius Weisbach would become the well-known Darcy–Weisbach equation still in use today. In 1848 he became Chief Engineer for the département of which Dijon is the capital. Soon thereafter he left Dijon due to ...