The precise location of the vena contracta for an orifice plate installation will vary with flow rate, and also with the beta ratio (β) of the orifice plate, defined as the ratio of bore diameter (d) to inside pipe diameter (D): The vena contracta corresponds to the narrow throat of a venturi tube. The point where the fluid flow profile constricts to a minimum cross-sectional area after flowing through the orifice is called the vena contracta, and it is the area of minimum fluid pressure. Orifice plates are typically sandwiched between two flanges of a pipe joint, allowing for easy installation and removal: Orifice Plates This is simply a metal plate with a hole in the middle for fluid to flow through. ![]() Of all the pressure-based flow elements in existence, the most common is the orifice plate.
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