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When we can manually measure the discharge flow rate,what for have we developed the concept of venturi meter or orifice metre?

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  • $\begingroup$ How would you manually measure the flow rate of a 3 metre diameter pipe with a flow rate of 4 m^3/s? How big is your bucket? $\endgroup$
    – Solar Mike
    Commented Jun 9, 2018 at 13:31
  • $\begingroup$ @SolarMikeGot it!! $\endgroup$
    – Shwetha
    Commented Jun 9, 2018 at 13:54

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Flow meters can also be used for high-precision applications. Imagine wanting to measure flow of gas, on the order of 0.1 sccm through a very small tube.

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Flow measurement device is used where you cannot just put the output of a fluid in to a tank where you can measure the time and volume filled, it is used in conditions like flow of refrigerant liquid through a pipe, or a petroleum gas flow inside a pipe. and also it is not easy to measure flow of gas directly.

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    $\begingroup$ Additionally, many processes rely on continuous flow measurement for control, so timing how long it takes to fill a bucket isn’t feasible. $\endgroup$
    – Mark
    Commented Jun 15, 2018 at 18:34

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