|April 22, 2013, 06:40||
Condensing Steam Analysis - What Model Should I Use??
Join Date: Sep 2011
Posts: 17Rep Power: 7
My analysis includes two-phase steam flow in a pipe (with 15% steam mass fraction, or 2% volume fraction). At a certain location, cold water is injected into the pipe, so that the steam condenses. The aim of this analysis is to determine the exact location (after the cold water injection) at which all of the steam has condensed into water.
Fluent has a built-in Wet Steam model (available with the density based solver), but it has a limitation of 20% steam mass fraction (according to the Users Guide), while my analysis requires a full condensing of the steam.
Another option is to use a regular multiphase model with pressure based solver (I suppose the Eulerian is the most suitable?), but it requires creating complicated UDF's that model the mass and heat transfer from the vapor to the water.
(1) What would you suggest in such a case? What model is the most suitable?
(2) Can I use the Wet Steam model, disregarding the 20% mass fraction limit?
(3) Are there any tutorials for steam condensing problems?
Thanks a lot in advance!!
|April 25, 2013, 13:50||
Join Date: Feb 2011
Posts: 20Rep Power: 8
hi i'm working on a similar case and i use mixture model. i used the model evaporation-condensation model in fluent but you also need a source term for energy equation but when i run the case with energy source term i cant converge it.i also wrote a udf for both mass transfer and energy source term but when i run it fluent says :
Error: Divergence detected in AMG solver: pressure correction
i haven't anyone help me to fix this .if you want give me your email and i send this udf to you.
|February 2, 2015, 22:37||
Join Date: Feb 2015
Posts: 1Rep Power: 0
I am working on steam generation and condensation for a solar still. Can you please share the UDF to me too. pls send the UDF to firstname.lastname@example.org
Thanks for your help. If i get any breakthrough, will share with you.
|cfd, condensing, fluent, steam, water|
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