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

Temperature of fluid in the domain

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 24, 2022, 18:38
Smile Temperature of fluid in the domain
  #1
New Member
 
Mohammad
Join Date: Sep 2022
Posts: 12
Rep Power: 4
Selawe97 is on a distinguished road
Hi
I am trying to simulate evaporation of gas R134a using Lee model in VOF, the problem is during the boiling process the bubble forms but the temperature of the liquid is increasing more than the saturation temperature though it should be constant. So why this happens is there something need to be defined.

Thanks
Selawe97 is offline   Reply With Quote

Old   October 26, 2022, 01:52
Default
  #2
New Member
 
Neel
Join Date: Nov 2018
Posts: 12
Rep Power: 7
neelcfd is on a distinguished road
What boundary conditions are you using at the wall?

If you're trying to do the boiling simulation then you should specify wall temperature higher than saturation temperature at the wall.

Also for Lee's model, model coefficient tuning is also required.
neelcfd is offline   Reply With Quote

Old   October 26, 2022, 12:22
Smile The domain
  #3
New Member
 
Mohammad
Join Date: Sep 2022
Posts: 12
Rep Power: 4
Selawe97 is on a distinguished road
Thanks for your response
Actually it is 2d squared domain all walls are adiabatic and constant heat flux at the bottom wall is applied, the temperature is exceeding the saturation temperature and boiling occur but not all fluid evaporates.the problem that the temperature of fluid is also increasing during the boiling which is higher than Tsat though it did not evaporate so why fluid temperature is rising ,is not supposed to evaporate one its temperature reach sat.temp, also regarding evap.frequency it is kept at default values,is it maybe the cause of the problem ?,how can i its value, i tried to search in literature but case is found to be similar to mine.
Thank you
Selawe97 is offline   Reply With Quote

Old   October 26, 2022, 13:05
Default
  #4
New Member
 
Neel
Join Date: Nov 2018
Posts: 12
Rep Power: 7
neelcfd is on a distinguished road
Change the frequency value & try to map the effect of it. This frequency value is also dependant on mesh.
neelcfd is offline   Reply With Quote

Reply

Tags
boiling point, evaporation condensation, lee model, multiphase heat transfer, vof model

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
chtMultiRegionFoam: Fluid in temperature domain decreases below initial temp. DanPad07 OpenFOAM 2 September 2, 2021 11:58
Multiphase flow - incorrect velocity on inlet Mike_Tom CFX 6 September 29, 2016 01:27
Overflow Error in Multiphase Modelling with Two Continuous Fluids ashtonJ CFX 6 August 11, 2014 14:32
convergenceof natural convection prob. in cfx cpkewat CFX 15 January 31, 2014 06:29
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11


All times are GMT -4. The time now is 04:30.