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

FLUENT - EVAPORATION and CONDENSATION SIMULATION

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

Like Tree6Likes
  • 2 Post By Patryk
  • 2 Post By Junphy
  • 1 Post By arunt
  • 1 Post By shahid nadeem

Reply
 
LinkBack Thread Tools Search this Thread 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: 15
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: 12
Rep Power: 10
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: 10
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.
Junphy is offline   Reply With Quote

Old   April 30, 2014, 00:38
Default
  #4
New Member
 
Xiaobing Zhang
Join Date: Apr 2014
Posts: 12
Rep Power: 10
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: 10
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.
chaitanyaarige likes this.
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: 11
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
Senior Member
 
Behrooz Jamshidi
Join Date: Apr 2013
Posts: 110
Rep Power: 11
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
Senior Member
 
Bill Wang
Join Date: Aug 2014
Posts: 109
Rep Power: 9
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

Old   February 20, 2016, 02:26
Smile
  #9
Member
 
Nazim
Join Date: Oct 2013
Posts: 93
Rep Power: 10
shahid nadeem is on a distinguished road
Quote:
Originally Posted by 6863523 View Post
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
Dear did you got the results kindly share the steps with me
shahid nadeem is offline   Reply With Quote

Old   February 20, 2016, 02:27
Smile
  #10
Member
 
Nazim
Join Date: Oct 2013
Posts: 93
Rep Power: 10
shahid nadeem is on a distinguished road
Quote:
Originally Posted by xiaobingwill View Post
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!
Hello did you got the UDF and if yes kindly share with me at snadeembe@gmail.com
shahid nadeem is offline   Reply With Quote

Old   February 20, 2016, 02:28
Smile
  #11
Member
 
Nazim
Join Date: Oct 2013
Posts: 93
Rep Power: 10
shahid nadeem is on a distinguished road
Quote:
Originally Posted by Ahmed Alkaisi View Post
Hi all,
* Can anyone tell me which model will be perfect for water evaporation-condensation in a close or open system within Fluent environment, please?
* Is it VOF, Eulerian or Mixture Model? and
* How many phases should I chose 2 ( water and air)
or 3 ( water, air and mixture)?
Answer me please
Many thanks all
Yours, Alkaisi
ahmedalkaisi82@gmail.com
VOF OFfcourse
Ahmed Alkaisi likes this.
shahid nadeem is offline   Reply With Quote

Old   June 12, 2017, 14:22
Default
  #12
Member
 
ram_call's Avatar
 
ram
Join Date: Apr 2013
Posts: 36
Rep Power: 11
ram_call is on a distinguished road
VOF is not suitable when phases are interpenetrating. Is is better to use it when boundary between phases is sharp as like open channels (water - air)

As far as in know, older versions of Fluent dont have phase change icon. it is better to use Ansys Fluent versions.
ram_call is offline   Reply With Quote

Old   July 4, 2017, 01:51
Default
  #13
Member
 
Ahmed Alkaisi's Avatar
 
Ahmed Alkaisi
Join Date: Aug 2015
Location: Australia
Posts: 80
Rep Power: 8
Ahmed Alkaisi is on a distinguished road
Send a message via Skype™ to Ahmed Alkaisi
Hi all
Firstly, from my experience vof model is the best and the easiest way to deal with evaporation- condensation multiphase problem.
Secondly, do you have any update on your simulation?
Regards

Sent from my SM-G900I using CFD Online Forum mobile app
Ahmed Alkaisi is offline   Reply With Quote

Old   September 25, 2018, 14:17
Default
  #14
New Member
 
Tonoy Mondol
Join Date: Sep 2018
Posts: 13
Rep Power: 5
Tonoy Mondol is on a distinguished road
Quote:
Originally Posted by Patryk View Post
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
have you done the problem? I want your code for an idea related to evaporation condensation
Tonoy Mondol is offline   Reply With Quote

Old   January 15, 2019, 06:50
Default
  #15
New Member
 
GW
Join Date: Nov 2018
Posts: 6
Rep Power: 5
violin000 is on a distinguished road
Quote:
Originally Posted by Tonoy Mondol View Post
have you done the problem? I want your code for an idea related to evaporation condensation
The problem I am facing now is that after adding UDF, the gas phase will not increase. Do you solve it? Could you share your code? 603570326@qq.com
violin000 is offline   Reply With Quote

Old   March 12, 2019, 08:09
Default
  #16
New Member
 
jeet verma
Join Date: Mar 2019
Posts: 4
Rep Power: 5
jeet verma is on a distinguished road
Quote:
Originally Posted by violin000 View Post
The problem I am facing now is that after adding UDF, the gas phase will not increase. Do you solve it? Could you share your code? 603570326@qq.com
i am also facing the sane type of problem can you please send me your code at jeet.vrm18@gmail.com
jeet verma is offline   Reply With Quote

Old   June 20, 2019, 20:28
Default
  #17
Member
 
Soumitra Vadnerkar
Join Date: Aug 2018
Posts: 70
Rep Power: 5
soumitra2102 is on a distinguished road
I am using evaporation-condensation model. I also tried the Mass rate Linearization UDF available in Fluent UDF guide. But I am not able to see the considerable liquid vapor fraction.

My case is tube flow inlet at 240C @ 3 MPa water vapor. Tube wall is isothermal @100C. At exit pressure drop is 7.25KPa (experiment) with complete condensation to liquid phase.

I am getting the pressure drop right, but temperature profile significantly lower than the experimental.

Can somebody suggest me something on this.
my email is soumitra2102@gmil.com

Thank You.
soumitra2102 is offline   Reply With Quote

Old   September 27, 2020, 09:22
Default
  #18
New Member
 
Aman Jaiswal
Join Date: Sep 2020
Posts: 3
Rep Power: 3
Jassu is on a distinguished road
hello sir, can you please help me simulating a single water droplet evaporation in static air surrounding.
my mail : aman.mec1721@yahoo.com
Jassu is offline   Reply With Quote

Old   September 27, 2020, 09:23
Default
  #19
New Member
 
Aman Jaiswal
Join Date: Sep 2020
Posts: 3
Rep Power: 3
Jassu is on a distinguished road
Quote:
Originally Posted by Ahmed Alkaisi View Post
Hi all
Firstly, from my experience vof model is the best and the easiest way to deal with evaporation- condensation multiphase problem.
Secondly, do you have any update on your simulation?
Regards

Sent from my SM-G900I using CFD Online Forum mobile app
hello sir, can you please help me simulating a single water droplet evaporation in static air surrounding.
my mail : aman.mec1721@yahoo.com
Jassu is offline   Reply With Quote

Reply

Tags
evaporation condensation

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can Fluent perform evaporation and condensation simulation? Wei Shao FLUENT 25 December 1, 2017 04:12
Water Evaporation and condensation modeling Linjie FLUENT 3 February 6, 2012 13:08
Evaporation and condensation in a tube Wei Shao Main CFD Forum 4 September 16, 2009 10:19
Water Evaporation and condensation modeling Linjie CFX 6 May 24, 2007 14:55
condensation in FLUENT juraj FLUENT 0 December 14, 2004 06:53


All times are GMT -4. The time now is 06:36.