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    Obstruction Flowmeters

    Uploaded by

    arif_ashraf94
    The document discusses using orifice, venturi, and nozzle meters to measure fluid flow rates. It explains that these obstruction flowmeters work by constricting the flow area in a pipe and using the Bernoulli and mass balance equations between the pre-constriction and constricted points to determine flow rate based on pressure differences. As an example, it provides a problem where the flow rate of methanol through a 4 cm diameter pipe is measured using a 3 cm orifice meter, with the differential pressure head across the orifice found to be 11 cm.

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    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd

    Obstruction Flowmeters

    Uploaded by

    arif_ashraf94
    86 views7 pages
    The document discusses using orifice, venturi, and nozzle meters to measure fluid flow rates. It explains that these obstruction flowmeters work by constricting the flow area in a pipe and using the Bernoulli and mass balance equations between the pre-constriction and constricted points to determine flow rate based on pressure differences. As an example, it provides a problem where the flow rate of methanol through a 4 cm diameter pipe is measured using a 3 cm orifice meter, with the differential pressure head across the orifice found to be 11 cm.

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    Obstruction Flowmeters.ppt

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    The document discusses using orifice, venturi, and nozzle meters to measure fluid flow rates. It explains that these obstruction flowmeters work by constricting the flow area in a pipe and using the Bernoulli and mass balance equations between the pre-constriction and constricted points to determine flow rate based on pressure differences. As an example, it provides a problem where the flow rate of methanol through a 4 cm diameter pipe is measured using a 3 cm orifice meter, with the differential pressure head across the orifice found to be 11 cm.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    86 views7 pages

    Obstruction Flowmeters

    Uploaded by

    arif_ashraf94
    The document discusses using orifice, venturi, and nozzle meters to measure fluid flow rates. It explains that these obstruction flowmeters work by constricting the flow area in a pipe and using the Bernoulli and mass balance equations between the pre-constriction and constricted points to determine flow rate based on pressure differences. As an example, it provides a problem where the flow rate of methanol through a 4 cm diameter pipe is measured using a 3 cm orifice meter, with the differential pressure head across the orifice found to be 11 cm.

    Copyright:

    © All Rights Reserved
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    of 7

    Obstruction

    Flowmeters: Orifice,
    Venturi, and Nozzle
    Meters

    Consider incompressible steady flow of a fluid


    in a horizontal pipe of diameter D that is
    constricted to a flow area of diameter d, as
    shown in Fig. below. The mass balance and
    the Bernoulli quations between a location
    before the constriction (point 1) and the
    location where constriction occurs (point
    2)can be written as

    EXAMPLE Measuring Flow Rate with an Orifice Meter


    The flow rate of methanol at 20C (=788.4 kg/m3 and
    =5.857 10-4 kg/m s) through a 4-cm-diameter pipe is to be
    measured with a 3-cm-diameter orifice meter equipped with a
    mercury manometer across the orifice place, as shown in Fig. 8
    60. If the differential height of the manometer is read to be 11 cm,
    determine the flow rate of methanol through the pipe and the
    average flow velocity.

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