A Venturi Meter is a device in which pressure energy is converted into kinetic energy and it is used for measuring the rate of flow of fluids through pipes.
How it Works
A Venturi flow meter contains a throat (d) which is smaller in diameter to the pipe (D), into which it fits.
When the fluid flows through it, the resultant pressure at ‘d’ is lower than the upstream pressure of ‘D’. These pressures at ‘d’ and ‘D’ can be measured using pressure tappings and the difference in pressure can be used to calculate the flowrate of fluid in the pipe.
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Differential pressure meters work on the principle of calculating a flow rate based on the change in pressure between two measured points.