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  • contraction in NOZZLE working principle....

    ppkmech

    Member

    Updated: Oct 24, 2024
    Views: 1.1K
    It is known that when the water flow from one end of the nozzle to other the pressure remains unchanged and the velocity gets changed. "pressure is inversely proportional to velocity ". But according to the formula "P=F/A", if the area gets decreased the pressure gets increased. How the both pressure and velocity increasing simultaneously.....😕
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  • Amith Gupta

    Member • Jul 12, 2012

    ppkmech
    It is known that when the water flow from one end of the nozzle to other the pressure remains unchanged and the velocity gets changed. "pressure is inversely proportional to velocity ". But according to the formula "P=F/A", if the area gets decreased the pressure gets increased. How the both pressure and velocity increasing simultaneously.....😕
    more pressure would mean more force according to the equn u have given. More force naturally would lead to more speed !😉
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  • ppkmech

    Member • Jul 12, 2012

    Amith Gupta
    more pressure would mean more force according to the equn u have given. More force naturally would lead to more speed !😉
    Thank you for your response..........
    But it is known that "pressure is inversely proportional to velocity"... Then how it is possible.. is it velocity or speed (in your quote)
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  • jigartank

    Member • Jul 12, 2012

    The main function of the nozzle is to increase the velocity of the flowing medium (i.e gas or liquid)through it. This is done at the expense of the pressure and internal energy. The end speed of the medium will depend on the final pressure ratio and the shape of the nozzle. But in the nozzle at each section the pressure will vary. The tendency of the flow is always from the higher pressure to the lower pressure side.
    With out the pressure difference the flow can not be there.
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  • Amith Gupta

    Member • Jul 14, 2012

    ppkmech
    Thank you for your response..........
    But it is known that "pressure is inversely proportional to velocity"... Then how it is possible.. is it velocity or speed (in your quote)
    think logically..that would be simple.. give some rest to the equn😁
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  • zaveri

    Member • Jul 14, 2012

    The lesser the area of cross-section of flow, the lesser would be the pressure applied by the flowing fluid.

    now in a nozzle the exit diameter is lesser, than the inlet diameter. doesn't it all add up now ?
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  • Ramani Aswath

    Member • Jul 14, 2012

    ppkmech
    It is known that when the water flow from one end of the nozzle to other the pressure remains unchanged and the velocity gets changed. "pressure is inversely proportional to velocity ". But according to the formula "P=F/A", if the area gets decreased the pressure gets increased. How the both pressure and velocity increasing simultaneously.....😕
    That assumption is incorrect.
    The same volume/time flows through the entire length. If the diameter decreases, the velocity has to increase to keep the flow constant.
    The first law of thermodynamics is that energy must be conserved. Since the velocity head increased, the pressure head must decrease to keep the total energy constant.
    <a href="https://www.engineeringtoolbox.com/orifice-nozzle-venturi-d_590.html" target="_blank" rel="nofollow noopener noreferrer">Orifice, Nozzle and Venturi Flow Rate Meters</a>
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