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Obstruction Flowmeters: Orifice, Venturi, and Nozzle Meters

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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

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EXAMPLE Measuring Flow Rate with an Orifice Meter The flow rate of methanol at 20°C ( =788.4 kg/m3 and µ=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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T W DAVIES1 CONSERVATION OF MECHANICAL ENERGY FRICTIONLESS FLOW ALONG A STREAMLINE MECHANICAL ENERGY BALANCE ON A UNIT MASS OF FLUID –POTENTIAL ENERGY.

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