query about convergent divergent nozzle

Chanpreet singh

Chanpreet singh

@chanpreet-singh-JFnl6O • Oct 27, 2024
i have a doubt that why there is a sudden decrease in the area from the inlet to throat while it is increasing gradually at outlet why not suddenly?
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  • Chanpreet singh

    Chanpreet singh

    @chanpreet-singh-JFnl6O • Nov 15, 2015

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  • Ramani Aswath

    Ramani Aswath

    @ramani-VR4O43 • Nov 15, 2015

    The design minimizes energy loss. In the convergent section streamlines are not much disturbed by the accelerating fluid. Beyond the throat it is important not to have significant vena contracta and allow gradual pressure recovery to avoid turbulence and loss of energy. This is achieved by using a 5 to 8 degree slope in this section. If you compare a venturi with an orifice plate this becomes clear. The oriifice plate has a coefficient 0.5 or less.
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