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Fluids

How is the ‘boiling-dia’ in Eulerian multiphase model calculated?

    • longcwang3
      Subscriber

      Hi, I am now simulating the boiling in vertical annulus using Eulerian multiphase model and RPI boiling model. I set the secondary phase diameter (vapor) diameter to 'boiling-dia', but I can't find how it's calculated from the User guide. Can anyone show the equation to calculated this diameter?

    • Karthik R
      Administrator

      Hello,

      You should be able to find this information from ANSYS Theory guide. Please refer to section 17.5.20.2 (v18.2) for details on RPI boiling model. Here is a screenshot of the information.

      Best Regards,

      Karthik

    • longcwang3
      Subscriber

      Thank you Kremella,

      I know how to find the equation for bubble departure diameter, but I can't find how the 'boiling-dia' in defining the secondary phase diameter is calculated. As shown below.

    • Karthik R
      Administrator

      Hello,

      Please check out section 17.5.20.5.2.1 on Bubble diameter in the Theory guide. This diameter is dependent on the local sub-cooling.

      Hope this helps.

      Best Regards,

      Karthik

    • longcwang3
      Subscriber

      Thanks for your reply, Karthik,

      So this bubble diameter is exactly the same as 'boiling-dia'. Does the wall lubrication models use this model as well?

    • Karthik R
      Administrator

      Hi,

      Yes, the wall lubrication models in RPI boiling model (Antal et al., section 17.5.8.1.1)  uses these bubble diameter definitions. I'd recommend you go through the theory guide for additional details. Hope this helps.

      Good luck with your model.

      Best Regards,

      Karthik

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