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Parartemia contracta was created in 1941.

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At what distance from orifice plate vena contracta formed Can it be calculated?

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What is the distance of Vena-Contracta from Nozzle?

The vena contracta is typically located at a distance of approximately half the diameter of the nozzle downstream from the nozzle exit. This is the point where the fluid stream reaches its minimum cross-sectional area and maximum velocity, following the contraction caused by passing through the nozzle. The exact distance can vary depending on factors like the flow conditions and the specific geometry of the nozzle.


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There exists several reasons but the governing one is the creation of the vena contracta effect due to flow separation at the inlet corners.


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Vena contracta is the point in a fluid stream where the diameter of the stream is the least, and fluid velocity is at its maximum, such as in the case of a stream issuing out of a nozzle, (orifice). (Evangelista Torricelli, 1643).The maximum contraction takes place at a section slightly downstream of the orifice, where the jet is more or less horizontal.The effect is also observed in flow from a tank into a pipe, or a sudden contraction in pipe diameter. Streamlines will converge just downstream of the diameter change, and a region of separated flow occurs from the sharp corner of the diameter change and extends past the vena contracta.The reason for this phenomenon is that fluid streamlines cannot abruptly change direction. In the case of both the free jet and the sudden pipe diameter change, the streamlines are unable to closely follow the sharp angle in the pipe/tank wall. The converging streamlines follow a smooth path, which results in the narrowing of the jet (or primary pipe flow) observed.Measurement of the vena contracta is useful in echocardiography, where it describes the smallest area of the blood flow jet as it exits a heart valve. This corresponds to the Effective Orifice Area calculated for heart valves using the continuity equation.


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