Phase Change in VOF Evaporation/Condensation Models

yoshiurr · April 12, 2017, 20:51

Hi,
I am currently working on a project that condenses steam in a closed vessel using Star CCM+ 9.04.001-R8 and having problems with phase change.

The physical models chosen are implicit unsteady, Eulerian Multiphase VOF, turbulent, Multiphase Interaction, gravity, segregated fluid temperature, and Evaporation/Condensation options selected.
The continuum is fluid with two Eulerian phases; steam and water. The material properties have been modified to match pressure and temperature conditions.

The problem is set up to have the vessel initially filled by steam at 400 K with pressure at 14.7 psi and surrounded by walls at 300 K.
The issue is that even though the temperature of the fluid is shifting from 400 K to 300 K as each time step is satisfied, phase change does not occur. If the pressure is 14.7 psi, the saturation pressure should be 373 K and phase should be occurring at this point.

Is there any suggestions to have phase change occur??

raskolnikov · September 1, 2017, 07:32

Do you have found any solution for that?

yamifm0f · May 7, 2018, 13:49

Hello

Can you please tell me how you used single components and not multi-components in order to use the evaporation model?!

I can only use it with multi components. If I do not specify a mixture in the gas star will not run.

Guilhermi52 · March 21, 2019, 08:12

Have you get the results? becaus I am doing a VOF condensation and It is not working? Any can help me?

April 12, 2017, 20:51	Phase Change in VOF Evaporation/Condensation Models	#1
yoshiurr New Member Ramon Yoshiura Join Date: Apr 2017 Location: USA Posts: 1 Rep Power: 0	Hi, I am currently working on a project that condenses steam in a closed vessel using Star CCM+ 9.04.001-R8 and having problems with phase change. The physical models chosen are implicit unsteady, Eulerian Multiphase VOF, turbulent, Multiphase Interaction, gravity, segregated fluid temperature, and Evaporation/Condensation options selected. The continuum is fluid with two Eulerian phases; steam and water. The material properties have been modified to match pressure and temperature conditions. The problem is set up to have the vessel initially filled by steam at 400 K with pressure at 14.7 psi and surrounded by walls at 300 K. The issue is that even though the temperature of the fluid is shifting from 400 K to 300 K as each time step is satisfied, phase change does not occur. If the pressure is 14.7 psi, the saturation pressure should be 373 K and phase should be occurring at this point. Is there any suggestions to have phase change occur??

March 21, 2019, 08:12	Condensation problem	#4
Guilhermi52 New Member Almir Guilherme Join Date: Mar 2019 Posts: 2 Rep Power: 0	Have you get the results? becaus I am doing a VOF condensation and It is not working? Any can help me?

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September 1, 2017, 07:32		#2
raskolnikov New Member mike Join Date: Aug 2013 Posts: 11 Rep Power: 11	Do you have found any solution for that?

May 7, 2018, 13:49		#3
yamifm0f Member fa Join Date: Nov 2013 Posts: 30 Rep Power: 11	Hello Can you please tell me how you used single components and not multi-components in order to use the evaporation model?! I can only use it with multi components. If I do not specify a mixture in the gas star will not run.