An orifice meter is a conduit and a restriction to create a pressure drop. An hour glass is a form of orifice. A nozzle, venturi or thin sharp edged orifice can be used as the flow restriction. In order to use any of these devices for measurement it is necessary to empirically calibrate them.
Practical to determine the coefficient of discharge for orifice meter
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Determination of Coefficient of discharge for Orifice Meter – Fluid Practicals
