Vena Contracta : Introduction, Formula & Phenomenon of Vena Contracta

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Vena contracta is a region in the discharge of water where the flow has greatly narrowed.

It can be discovered when there is an unexpected modification in the cross-sectional area.

The streamlines of the liquid cannot change abruptly when the CS area changes. This sudden reduction in the cross-sectional area makes the streamlines converge and form the vena contract.





  1. Vena Contracta  

In this region, the velocity of the flow is highest. From Vena contracta we can discover the coefficient of contraction.

Further, Vena contracta has a broad use in studying blood flow and in different treatments ad diagnoses like echocardiography.

It is estimated by the region of the orifice (Ao) and the coefficient of contraction (Cc).

Area of vena contract (Ac) = Ao * (Cc)

This process occurs because the fluid streamline can’t alter its direction unexpectedly. Streamline can’t follow Sharpe’s angles so Vena contract forms.


This phenomenon happens because of the fluid streamline can’t change its direction abruptly. Streamline can’t follow Sharpe angles so vena contract forms.




  2. References  

1. Content Filter & Authenticity Checking Team, Dream Civil International

(Our team checks every content & detail to maintain quality.)





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