Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….
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Calculate an accurate value for the differential pressure developed across the chosen Venturi, at maximum flow rate.
A Venturi is to be used to measure the flow rate of water in a pipe of diameter D = 0.20 m. The maximum flow rate of water is 1.5 × 103 m3 h−1, density is 103 kg m−3, and viscosity is 10−3 Pa s. Venturis with throat diameters of 0.10 m, 0.14 m and 0.18 m are available from the manufacturer.
(a) Choose the most suitable Venturi for the application, assuming a differential pressure at maximum flow of approximately 3 × 105 Pa.
(b) Calculate an accurate value for the differential pressure developed across the chosen Venturi, at maximum flow rate. (Use the following formula for the coefficient of discharge:
where
d = Venturi throat diameter, and ReD = Reynolds number referred to pipe diameter.)
