If velocity is increased – pressure energy will be decreased as per Bernoulli’s equation.Now, as the area decreased – the velocity of the water will be increased as per contuinity equation.When the water flows through the converging part, it signifies the water flows through the gradually decreased area. It is starting section of the venturi meter which is attached to the inlet pipe. Hence, the converging part means the area which is gradually decreased. This converging part is the starting part of the venturi meter and it is attached to the entrance. It should be free from fittings, misalignment, and other sources which creates large-scale turbulence.It should be proceeded by a straight pipe and the length should not be less than 5 to 10 times the pipe diameter, in case there is one short section within venturi meter.Normally, it is not considered as a part of venturi tube but few manufacturer extended a connection to it.
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