enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Orifice plate - Wikipedia

    en.wikipedia.org/wiki/Orifice_plate

    Orifice plate showing vena contracta. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. When a fluid (whether liquid or gaseous) passes through the orifice, its pressure builds up slightly upstream of the orifice [1] but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases.

  3. Talk:Orifice plate - Wikipedia

    en.wikipedia.org/wiki/Talk:Orifice_plate

    (Q/A1) = V1 = constant regardless of bore diameter if the flow rate and pipe size are known. (Q/A2) = V2 varies with bore diameter and is generally of less interest to me. I like to be able to see formulae which are more directly related to V1, as the last equality is. Third: The last equality can be handy in situations where the bore diameter ...

  4. Restrictive flow orifice - Wikipedia

    en.wikipedia.org/wiki/Restrictive_flow_orifice

    A restrictive flow orifice (RFO) is a type of orifice plate.They are used to limit the potential danger, damage, or wastage of an uncontrolled flow from, for example, a compressed gas cylinder [1] [2] They are generally not limiting the flow during normal operation but if a fault or failure occurs causing uncontrolled flow the orifice will present a restriction, limiting the flow.

  5. Hydraulic diameter - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_diameter

    The hydraulic diameter, D H, is a commonly used term when handling flow in non-circular tubes and channels. Using this term, one can calculate many things in the same way as for a round tube. When the cross-section is uniform along the tube or channel length, it is defined as [1] [2] =, where

  6. Flow conditioning - Wikipedia

    en.wikipedia.org/wiki/Flow_conditioning

    The fundamental difference between the orifice meter and the turbine meter is the flow equation derivation. The orifice meter flow calculation is based on fluid flow fundamentals (a 1st Law of Thermodynamics derivation utilizing the pipe diameter and vena contracta diameters for the continuity equation). Deviations from theoretical expectation ...

  7. Choked flow - Wikipedia

    en.wikipedia.org/wiki/Choked_flow

    All gases flow from higher pressure to lower pressure. Choked flow can occur at the change of the cross section in a de Laval nozzle or through an orifice plate. The choked velocity is observed upstream of an orifice or nozzle. The upstream volumetric flow rate is lower than the downstream condition because of the higher upstream density.

  8. Vena contracta - Wikipedia

    en.wikipedia.org/wiki/Vena_contracta

    The coefficient of contraction is defined as the ratio between the area of the jet at the vena contracta and the area of the orifice. C c = Area at vena contracta/Area of orifice. The typical value may be taken as 0.611 for a sharp orifice (concentric with the flow channel). [2] [3] The smaller the value, the greater the effect the vena ...

  9. Reynolds number - Wikipedia

    en.wikipedia.org/wiki/Reynolds_number

    D o is the inside diameter of the outer pipe, D i is the outside diameter of the inner pipe. For calculation involving flow in non-circular ducts, the hydraulic diameter can be substituted for the diameter of a circular duct, with reasonable accuracy, if the aspect ratio AR of the duct cross-section remains in the range ⁠ 1 / 4 ⁠ < AR < 4. [11]