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  2. Slip ratio (gas–liquid flow) - Wikipedia

    en.wikipedia.org/wiki/Slip_ratio_(gas–liquid_flow)

    Slip ratio (or velocity ratio) in gas–liquid (two-phase) flow, is defined as the ratio of the velocity of the gas phase to the velocity of the liquid phase. [1]In the homogeneous model of two-phase flow, the slip ratio is by definition assumed to be unity (no slip).

  3. Flow conditioning - Wikipedia

    en.wikipedia.org/wiki/Flow_conditioning

    Figure (1) showing typical velocity flow profile for natural gas measurement. The most commonly used description of flow conditions within the pipe is the flow velocity profile. Fig.(1) shows the typical flow velocity profile for natural gas measurement. [4] The shape of the flow velocity profile is given by the following equation,

  4. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    where is the density of the fluid, is the average velocity in the pipe, is the friction factor from the Moody chart, is the length of the pipe and is the pipe diameter. The chart plots Darcy–Weisbach friction factor f D {\displaystyle f_{D}} against Reynolds number Re for a variety of relative roughnesses, the ratio of the mean height of ...

  5. Entrance length (fluid dynamics) - Wikipedia

    en.wikipedia.org/wiki/Entrance_length_(fluid...

    In fluid dynamics, the entrance length is the distance a flow travels after entering a pipe before the flow becomes fully developed. [1] Entrance length refers to the length of the entry region, the area following the pipe entrance where effects originating from the interior wall of the pipe propagate into the flow as an expanding boundary layer.

  6. Compressible flow - Wikipedia

    en.wikipedia.org/wiki/Compressible_flow

    Compressible flow (or gas dynamics) is the branch of fluid mechanics that deals with flows having significant changes in fluid density.While all flows are compressible, flows are usually treated as being incompressible when the Mach number (the ratio of the speed of the flow to the speed of sound) is smaller than 0.3 (since the density change due to velocity is about 5% in that case). [1]

  7. Darcy–Weisbach equation - Wikipedia

    en.wikipedia.org/wiki/Darcy–Weisbach_equation

    In fluid dynamics, the Darcy–Weisbach equation is an empirical equation that relates the head loss, or pressure loss, due to friction along a given length of pipe to the average velocity of the fluid flow for an incompressible fluid.

  8. Flow measurement - Wikipedia

    en.wikipedia.org/wiki/Flow_measurement

    For pipe flows a so-called transit time method is applied where a radiotracer is injected as a pulse into the measured flow. The transit time is defined with the help of radiation detectors placed on the outside of the pipe. The volume flow is obtained by multiplying the measured average fluid flow velocity by the inner pipe cross-section.

  9. Flow velocity - Wikipedia

    en.wikipedia.org/wiki/Flow_velocity

    In many engineering applications the local flow velocity vector field is not known in every point and the only accessible velocity is the bulk velocity or average flow velocity ¯ (with the usual dimension of length per time), defined as the quotient between the volume flow rate ˙ (with dimension of cubed length per time) and the cross sectional area (with dimension of square length):