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    Discussion in 'The main mechanical design forum' started by muhammedfay, Apr 28, 2014.

    1. muhammedfay

      muhammedfay New Member

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      Please explain me what will happen to the fluid when it enters to the diverging section of pipe and then to the converging section of pipe
       
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    3. Erich

      Erich Well-Known Member

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      Two principles are important here.

      First. Continuity equation. Mass flow rate = constant.

      Therefore as the area of the pipe increases the velocity will decrease.

      Second principle is Bernoulli's equation. Which is a statement of Conservation of Energy.

      Now a question for you?

      How does the pressure change through the transition?
       
    4. shrirang44

      shrirang44 New Member

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      If velocity is decreasing, considering horizontal flow, pressure will rise.
       
    5. dtbrough

      dtbrough New Member

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      In a C-D nozzle as the flow of fluid or gas converges the flow is compressed and becomes sonic (mach 1) at the throat. Then as the nozzle/pipe diverges the flow will increase in velocity and become supersonic (>mach 1) where temperature and pressure will reduce.

      For more information look up: Compressible Flow
       

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