As the coolant approaches the contracted portion (throat) of the venturi flow- meter, the velocity of the coolant must increase as it flows through the contracted zone (throat). The angle of approach is such that no turbulence is introduced into the stream. A pressure tap is located at the side wall in the pipe ahead of the meter, and another one is located at the throat. The increase in velocity of the coolant water through the throat results in a lower pressure at the throat.

1 Additional Answer

A venturi metre is an equipment used to measure flow based on Bernoulli's principle. Bernoulli's principle state that as the velocity of a fluid increases, the pressure exerted by that fluid decreases. Flow is calculated by connecting a differential pressure meter between the upstream side of a venturi and its narrow point. The formula to find actual discharge is=amount of fluid collected/time taken.

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The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The Venturi effect is named after Giovanni Battista Venturi (1746–1822),...