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The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section (or choke) of a pipe.
Essentially the aspect of the Venturi effect we are interested in is that;
An in compressible fluid must have an increase in velocity as it passes through a pipe section with smaller area to conserve mass flow rate according to the Bernoulli equation
In our case there is no height change so the equation becomes;
Stating that the pressure change is proportional to the squared velocity change. This is how choked flow is achieved.
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