Hi everybody,
I’m trying to simulate heat transfer form vertical cylinder submerged in water tank. Everything is running smoothly apart of the boundary condition at the top of the tank where evaporation takes place. The heat transfer coefficient matches with the experiment at certain time of the simulation but if I allow more time the result changes. I think that is due to inappropriate B.C at the water surface. Does anybody have suggestion to how the evaporation heat loss can be treated?
Thanks in advance .
In openfoam there is a solver that indroduce additional equations for the state change like Schnerr-Saurer or Kunz models for cavitation etc.. I think in fluent you should fine an option in order to activate such kind of equations.
Franco
Hi, with Comsol multiphysics, I use diffusion of water vapor at the surface with considering a concentration of saturated vapor at the surface you can find in tables; that concentration depends on the pressure and temperature.
is it the quenching process, i also have the same problem in my model i have to calculate the time in which the temp. of the cylinder is about 100C from 1100C . I also dont know what boundry condn. should i used? can you send me your case file?
Hello everybody,
I would like to apologise for the late replay and to thank you for your correspond.
Dear Franco Concli, I’ve tried your suggestion but it didn’t work for my case as the working temperature is less than the saturation (100 degree C).
Now I’m trying to write a UDF for the top surface but before that I have to find an evaporation heat transfer correlation for water temperature ranging from 20-70 degree C.
Dear Gino OLIVE, unfortunately I don’t have access to Comsol and I’m restricted with Fluent.
Again thank you very much
Ahmed
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