CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

FLUENT - EVAPORATION and CONDENSATION SIMULATION

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

Like Tree1Likes
  • 1 Post By Junphy

Reply
 
LinkBack Thread Tools Display Modes
Old   June 21, 2010, 08:44
Default FLUENT - EVAPORATION and CONDENSATION SIMULATION
  #1
New Member
 
Patryk
Join Date: Mar 2009
Posts: 4
Rep Power: 8
Patryk is on a distinguished road
Let's say there is a closed aluminum cube. The cube is filled in 1/5 with water and in 4/5 with air . The deck of the cube is a source of the heat. The surface of the cube is constantly cooled. The water in it evaporates, traveles to the surface, gets cooled, condensates and drops down (some kind of a heat pipe).
I want to simulate it with FLUENT.

Questions:
Which model of phases is appropriate(VOF,Eulerian,DPM,Mixture model)? How manage with mass transfer from liquid phase to gasous and vice versa? How simulate heat transfer in this case?
Thank you in advance,
Patryk
Patryk is offline   Reply With Quote

Old   April 24, 2014, 23:43
Default
  #2
New Member
 
Xiaobing Zhang
Join Date: Apr 2014
Posts: 11
Rep Power: 3
xiaobingwill is on a distinguished road
Hi I'm doing similar modeling, can u tell me how did you do this simulation in the end?: Thanks
xiaobingwill is offline   Reply With Quote

Old   April 25, 2014, 01:35
Default
  #3
New Member
 
Junphy Liues
Join Date: Apr 2014
Posts: 9
Rep Power: 3
Junphy is on a distinguished road
I am working on this simulation right now, mixture is perfect I think, the result is better than other models. U need to wright some UDFs to realize the phase change.
xiaobingwill likes this.
Junphy is offline   Reply With Quote

Old   April 30, 2014, 00:38
Default
  #4
New Member
 
Xiaobing Zhang
Join Date: Apr 2014
Posts: 11
Rep Power: 3
xiaobingwill is on a distinguished road
Hi Junphy,

Is it OK for you to share your UDF with me? I got stuck with condensation, and my results with evaporation is not that good. Can you please help me with this?

My email is zhangxiaobinghust@gmail.com

Thanks a lot!

Quote:
Originally Posted by Junphy View Post
I am working on this simulation right now, mixture is perfect I think, the result is better than other models. U need to wright some UDFs to realize the phase change.
xiaobingwill is offline   Reply With Quote

Old   April 30, 2014, 02:29
Default
  #5
New Member
 
Arun Tamilarasan
Join Date: Apr 2014
Posts: 3
Rep Power: 3
arunt is on a distinguished road
Hey,
I am working on a similar problem but I am focusing on the evaporation behavior alone. The mixture model seems to work fine and as for the UDF, if you have the fluent UDF manual, you can refer it and get on it on your own. Also, you will have to patch water and vapor regions at t=0. For some reason, I cannot patch them and the vapor volume fraction seems zero always. Anyway, the mixture model will be the correct multiphase physics for your problem.

Arun.
arunt is offline   Reply With Quote

Old   May 14, 2014, 09:54
Default droplet evaporation
  #6
New Member
 
navid
Join Date: May 2012
Posts: 6
Rep Power: 5
navid2 is on a distinguished road
Quote:
Originally Posted by arunt View Post
Hey,
I am working on a similar problem but I am focusing on the evaporation behavior alone. The mixture model seems to work fine and as for the UDF, if you have the fluent UDF manual, you can refer it and get on it on your own. Also, you will have to patch water and vapor regions at t=0. For some reason, I cannot patch them and the vapor volume fraction seems zero always. Anyway, the mixture model will be the correct multiphase physics for your problem.

Arun.
hi
i'm working on evaporation of a single water droplet in a square computational field that is included static air. can u help me about settings of ansys fluent for this problem?
any helps is appreciated.
navid2 is offline   Reply With Quote

Old   May 14, 2014, 11:07
Default
  #7
Member
 
Behrooz Jamshidi
Join Date: Apr 2013
Posts: 75
Rep Power: 4
CFD-fellow is on a distinguished road
Hi
With AnsysFluent its not needed to write udf.It has the mass transfer equations for evaporation and condensation.
These kinds of simulations are really hard to be handled by commercial codes.
CFD-fellow is offline   Reply With Quote

Old   August 23, 2014, 21:14
Default
  #8
New Member
 
Bill Wang
Join Date: Aug 2014
Posts: 21
Rep Power: 3
6863523 is on a distinguished road
Hi CFD-fellow,
I tried the evaporation and condensation mechanism of transient VOF model in FLUENT14.5, but the result is not good, as the phase fraction always change with time and in the final, either the liquid turned in to vapor or vapor turned into liquid. the problem is in the vapor domain, liquid shoud not exist vise verse. I did not interpret/compile any UDFs. At the initial of the simulation, I patched liquid in liquid domain and vapor in vapor domain.
Have you worked the simulation out? Would you please give me some hint? email:1612955572@qq.com
Thank you in advance.
Regards,
Bill
6863523 is offline   Reply With Quote

Reply

Tags
evaporation condensation

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
Water Evaporation and condensation modeling Linjie CFX 8 April 23, 2015 18:30
evaporation and condensation simulation for help Wei Shao FLUENT 18 April 27, 2014 01:37
Water Evaporation and condensation modeling Linjie FLUENT 3 February 6, 2012 14:08
Evaporation and condensation in a tube Wei Shao Main CFD Forum 4 September 16, 2009 10:19
condensation in FLUENT juraj FLUENT 0 December 14, 2004 07:53


All times are GMT -4. The time now is 12:48.