FLOW MEASUREMENT APPARATUS VENTURIMETER
Venturimeter is a device used for measurement of rate of flow of fluid through a pipe. The basic principle on which venturimeter works is that by reducing the cross- sectional area of flow passage, a pressure difference is created and the measurement of the pressure difference enables the determination of the discharge through the pipe.
A venturi meter consists of (1) an inlet section followed by a convergent cone, (2) a cylindrical throat and (3) a gradually divergent cone. Since the cross – sectional area of the throat is smaller than the cross sectional area of the inlet section, the velocity of flow at the throat will become greater than that at the inlet section, according to continuity equation. The increase in the velocity of flow at the throat results in the decrease in the pressure at this section.
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