CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

phase change

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   May 21, 2003, 14:53
Default phase change
Posts: n/a
Hello All,

In DPM case, the discrete phase is liquid water and one of species in the continuous phase is vapor water. To my understanding, liquid water can be converted to vapor water by evaporating (Fluent has a marco for it). I am not sure if the specie vapor water can be condensed to liquid water (discrete phase)? If possible, do i need write some UDFs? Which Marcos?

Thank you!
  Reply With Quote

Old   May 22, 2003, 08:18
Default Re: phase change
Posts: n/a
hi Rookie, I think my problem is somewhat similar to you. mine is a closed cylindrical tank in which liquid hydrogen is partially filled(cryogenic propellant tank). Now, since the liquid will be stored at 20k,there will be heat leakage into the tank. so there has to be evaporation from liquid to the ullage space... I am solving this problem in fluent using VOF model and there is no option for presently i am trying using UDF for mass transfer at phase interaction panel. I am struggling to come out with a perfect equation including vapor pressure. So can you help me in this regard. thanks in advance prasanth
  Reply With Quote

Old   May 22, 2003, 10:33
Default Re: phase change
Posts: n/a
hi rookie,

Is the temperature in the domain is going below saturation temp. of water? Then in that case, you have to add mass source term for water and mass sink term for vapor phase.

  Reply With Quote

Old   June 12, 2003, 20:47
Default Re: phase change
Posts: n/a
Thank you! prasanth and Mahesh,

At the beginning, I thought in Mahesh's way. But it is not easy to implement. I found an example that may help UDF manual6.1 section 4.6.12. I will let you guys know what comes up.

  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Solid/liquid phase change fabian_roesler OpenFOAM 10 December 24, 2012 07:37
About phase change heat and mass transfer Michael FLUENT 2 February 13, 2011 02:49
Phase change phdsantos FLUENT 0 March 20, 2009 11:19
Two phase flow with phase change Ahmad Al-Zoubi CFX 1 November 26, 2008 04:59
How to model the solid-fluid phase change in CFX ohrmond CFX 2 May 26, 2006 06:27

All times are GMT -4. The time now is 06:57.