[pratik khandelwal]

hello friends!!!!!

I want to know,Is condensation phenomenon possible with
"Evaporation-Condensation" model in Fluent??? or I must require UDF for that??

Thank you in advance!!!

[pratik khandelwal]

Hiiiiii friends!!!!!

I want to simulate condensation problem..
I have attached my mesh geometry.
my problem is that i am not gettting liquid flow equal to vapour mascondensation is occuring but my liquid volume fraction at outlet is comming 4*e-10.

my BCs at inlet - vapor mass flow and temperature
outlet- pressure outlet
Through the tubes coolant i.e. water is flowing

I am using "Evaporation-condensation" model
can anyone help me regarding fluent setting or any other things regarding this problem??

Any help will be greatly appreciated

thank!!!!

[vasava]

Have you monitored the liquid volume fraction at the outlet over time? How long have you run your simulation?

[pratik khandelwal]

Thank you sir for ur response!!!

I am not getting liquid at outlet but it is in all domain.
I have experimental results. Experiment was carried for 322 tubes.
But for simplicity I am doing simulation on 3 tubes as shown in fig.

I am using mixture model, viscous laminar.
In Phase interaction'Evaporation-Condensation' model
sir I may be wrong in setting boundary conditions.
I have given boundary conditions as follows:
Inlet: vapor mass flow rate 0.00319kg/s. which was 0.3424 for 322 tubes
liquid mass flow ratw 0 kg/s
mixture-Temperature 313k
Outlet- liquid- backflow volume fraction 1
mixture- temperature 312k
tubes(convective wall)- mixture- heat flux= -2664w
here i am having doubt because i have value in watt but have to give it
in w/m2. which area should i take?? i have taken inside area of tube
value goes very high 15485345w/m2.
i have heat transfer coefficient of coolant and condensation. should i use this?

inlet temp of coolant is 35.8degree cel and outlet temp of coolant is 37.4 degree cel

My condensing fluid is water.
please tell me How to set BCs.


Thank you

[vasava]

Is it possible for you to send your case to me? It would be easier for me to help. My e-mail is paritoshvasava@gmail.com

[pratik khandelwal]

yes, sure!!!!

i will send my case on your mail id.

[maofeng]

Originally Posted by pratik khandelwal

yes, sure!!!!

i will send my case on your mail id.

hi bro，
have you solved this，I have the same problem，the condensation rate is very small，water volume fraction of outlet is about 10-3，and if you can give me some help， I am care about this cause it already make me crazy，Thank you。