![]() When the fluid flows through it, the pressure at the throat is lower than the upstream pressure (because of increased kinetic energy due to increased velocity, ½ mv 2) and the consequent reduction in flow energy (E f = P . The restriction diameter should not be less than 0.224 D, and not more than 0.742 D where D is the nominal bore diameter of the pipe. A venturi tube contains a throat which is smaller in a diameter to the pipeline, into which it fits.
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