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What is Vena Contract in Orifice?

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Asked: July 27, 20202020-07-27T19:45:36-07:00 2020-07-27T19:45:36-07:00In: Miscellaneous
civl engineer
civl engineer

civl engineer

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civl engineer User

What is Vena Contract in Orifice?

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  1. Himanshu joshi

    Himanshu joshi

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    Himanshu joshi Learner
    2020-07-28T22:05:17-07:00Added an answer on July 28, 2020 at 10:05 pm

    Vena-contract is a section in orifice which has a minimum cross-section area and has maximum velocity.
    At this, all streamlines are parallel, straight, and uniform, so have laminar flow.
    It is calculated by the area of the orifice (Ao) and the coefficient of contraction (Cc).
    Area of vena contracta Ac= Ao *(Cc).

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  2. CB Sowmya

    CB Sowmya

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    CB Sowmya User
    2020-07-28T22:40:32-07:00Added an answer on July 28, 2020 at 10:40 pm

    Vena contracta is a section in the flow of water where the flow has considerably narrow. Vena contracta can be found when there is a sudden change in the cross-sectional area.  The streamlines of the fluid cannot change abruptly when the CS area changes. This sudden reduction in the cross-sectional area makes the streamlines converge and form the vena contracta.

    In this section, the velocity of the flow is maximum. From Vena contracta we can find the coefficient of contraction.

    Further, Vena contracta has wide use in studying the blood flow and in various treatments ad diagnoses like echocardiography.

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  3. nikeetasharma

    nikeetasharma

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    2020-11-28T19:20:18-08:00Added an answer on November 28, 2020 at 7:20 pm

    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 the stream issuing out of a nozzle. It is a place where cross section area is minimum.

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  4. Preet Chovatiya

    Preet Chovatiya

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    Preet Chovatiya Learner
    2020-07-28T22:47:46-07:00Added an answer on July 28, 2020 at 10:47 pm

    Vena contract is the point in flowing fluid at where the pressure energy is minimum and kinetic energy is maximum.

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

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  5. Vivek Patel

    Vivek Patel

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    Vivek Patel User
    2020-07-29T09:25:50-07:00Added an answer on July 29, 2020 at 9:25 am

    Veena Contra is a section where velocity distribution is uniform, and fluid streamline is parallel to each other.

    The study of Vena Contra is used for actual velocity study in jet flow.

    Coefficient of velocity is the ratio of actual velocity divided by the theoretical velocity

    The actual velocity is equal to the velocity at vena contra.

     

     

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