# FLUENT - EVAPORATION and CONDENSATION SIMULATION

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 June 21, 2010, 08:44 FLUENT - EVAPORATION and CONDENSATION SIMULATION #1 New Member   Patryk Join Date: Mar 2009 Posts: 4 Rep Power: 9 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

 April 24, 2014, 23:43 #2 New Member   Xiaobing Zhang Join Date: Apr 2014 Posts: 11 Rep Power: 4 Hi I'm doing similar modeling, can u tell me how did you do this simulation in the end?: Thanks

 April 25, 2014, 01:35 #3 New Member   Junphy Liues Join Date: Apr 2014 Posts: 9 Rep Power: 4 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.

April 30, 2014, 00:38
#4
New Member

Xiaobing Zhang
Join Date: Apr 2014
Posts: 11
Rep Power: 4
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 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.

 April 30, 2014, 02:29 #5 New Member   Arun Tamilarasan Join Date: Apr 2014 Posts: 3 Rep Power: 4 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.

May 14, 2014, 09:54
droplet evaporation
#6
New Member

navid
Join Date: May 2012
Posts: 6
Rep Power: 6
Quote:
 Originally Posted by arunt 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.

 May 14, 2014, 11:07 #7 Member   Behrooz Jamshidi Join Date: Apr 2013 Posts: 78 Rep Power: 5 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.

 August 23, 2014, 21:14 #8 New Member   Bill Wang Join Date: Aug 2014 Posts: 23 Rep Power: 4 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

February 20, 2016, 03:26
#9
Member

shahid
Join Date: Oct 2013
Posts: 88
Rep Power: 4
Quote:
 Originally Posted by 6863523 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

February 20, 2016, 03:27
#10
Member

shahid
Join Date: Oct 2013
Posts: 88
Rep Power: 4
Quote:
 Originally Posted by xiaobingwill 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

February 20, 2016, 03:28
#11
Member

shahid
Join Date: Oct 2013
Posts: 88
Rep Power: 4
Quote:
 Originally Posted by Ahmed Alkaisi 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

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