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

- July 15, 2018 at 7:57 pm
  
  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?
- July 16, 2018 at 10:44 am
  
  KR
  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
- July 16, 2018 at 1:50 pm
  
  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.
- July 16, 2018 at 4:42 pm
  
  KR
  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
- July 16, 2018 at 4:53 pm
  
  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?
- July 16, 2018 at 5:26 pm
  
  KR
  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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