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           FLUIDFLOW 3 
            2-Phase (multiphase)
            gas/liquid simulation 
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      Example 2 - Refrigerant system with changing
      quality


      
In this example we have a single
      fluid, R-152a flowing through the system shown below, from a
      known pressure (node 1) at 1.15 atm and the fluid is at its saturation
      temperature of -18°C. We have specified a vapour quality
      (vapour mass fraction of 0.15) at the inlet and we are carrying
      out the calculation using the Whalley criteria.


      




      Overveiw of Results


      
This is an example of two phase
      flow with changing quality. This means that the vapour mass fraction
      is not constant and there is mass transfer between the phases.
      You can see this in the results of all flowsheet elements, examine
      the vapour quality entering and leaving Pipe 1, and you will
      see that quality is increasing flow takes place through the system.
      This is because the pressure falls as the fluid flows down a
      pipe (or across a bend - see Bend 6)) and so some of the liquid
      boils to form more vapour. This is called flashing, and FluidFlow3:
      2Phase assumes that instantaneous isenthalpic flashing occurs.
      You should also notice that velocities are increasing and that
      mixture densities are decreasing. 

      At the heat exchanger we are adding some 10000 Watts of heat
      and this has the effect of vaporising additional liquid. Across
      this element the quality increases from 0.1858 to 0.2697.


      

        

           FLUIDFLOW 3 
            2-Phase (multiphase)
            gas/liquid simulation 
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           Contents 
          Next
           
        

      

        

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