CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Programming & Development

liquid/vapor mass flux boundary conditions

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

Like Tree2Likes
  • 1 Post By gaza
  • 1 Post By andrea

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 17, 2017, 16:39
Default liquid/vapor mass flux boundary conditions
  #1
New Member
 
Join Date: Jun 2017
Posts: 11
Rep Power: 7
BarCFD is on a distinguished road
Hi Foamers,

A Simplified geometry for my problem is provided here. I have an evaporator where water comes in from inlet and steam goes out from outlet. I wonder if I can define boundary conditions in the way that mass flux of liquid in the inlet becomes same as mass flux of vapor in the outlet. Can I use groovyBC? How?

Thanks in advance,
Attached Images
File Type: png Screenshot from 2017-10-17 16-23-58.png (14.0 KB, 51 views)
BarCFD is offline   Reply With Quote

Old   October 19, 2017, 17:13
Default
  #2
Senior Member
 
Przemek
Join Date: Jun 2011
Posts: 245
Rep Power: 14
gaza is on a distinguished road
Hi BarCFD
Of course you can, however it should result from void fraction equation rather from boundary condition (but I might be wrong)
BarCFD likes this.
__________________
best regards
pblasiak
gaza is offline   Reply With Quote

Old   October 23, 2017, 03:38
Default
  #3
Member
 
Andrea Petronio
Join Date: Mar 2009
Location: Trieste, Italy
Posts: 43
Rep Power: 16
andrea is on a distinguished road
Hi,
we addressed this problem while ago. You can find the details in this paper:
P. Sosnowski, A. Petronio, V. Armenio, "Numerical model for thin liquid film with evaporation and condensation on solid surfaces in systems with conjugated heat transfer", International Journal of Heat and Mass Transfer 66 (2013) 382395, in which a laminar case is discussed. Then we analyzed also a turbulent case with LES in:
Carlo Cintolesi, Andrea Petronio, Vincenzo Armenio
"Large-eddy simulation of thin film evaporation and condensation
from a hot plate in enclosure: First order statistics", International Journal of Heat and Mass Transfer 101 (2016) 11231137,
and in
Carlo Cintolesi, Andrea Petronio, Vincenzo Armenio, "Large-eddy simulation of thin film evaporation and condensation from a hot plate in enclosure: Second order statistics", International Journal of Heat and Mass Transfer 115 (2017) 410423.
Hope you can get some usefull hints,
ciao
BarCFD likes this.
andrea is offline   Reply With Quote

Old   October 23, 2017, 12:55
Default
  #4
New Member
 
Join Date: Jun 2017
Posts: 11
Rep Power: 7
BarCFD is on a distinguished road
Thanks a lot Andrea!
BarCFD is offline   Reply With Quote

Old   October 24, 2017, 10:37
Default
  #5
Senior Member
 
Charles
Join Date: Aug 2016
Location: Vancouver, Canada
Posts: 138
Rep Power: 8
Marpole is on a distinguished road
You either specify inlet mass flow flux or specify outlet mass flow flux. But you don't specify inlet mass flow flux using outlet mass flow flux. This doesn't make sense that computation could diverge easily.
Marpole is offline   Reply With Quote

Old   October 25, 2017, 14:07
Default
  #6
New Member
 
Join Date: Jun 2017
Posts: 11
Rep Power: 7
BarCFD is on a distinguished road
Quote:
Originally Posted by Marpole View Post
You either specify inlet mass flow flux or specify outlet mass flow flux. But you don't specify inlet mass flow flux using outlet mass flow flux. This doesn't make sense that computation could diverge easily.
Thanks Charles,

In fact the idea here is to verify the solvent for boiling in steady state condition. Assume that all vapor exits from boiler (to a condenser ) returns to boiler in the liquid phase.
BarCFD is offline   Reply With Quote

Old   October 25, 2017, 16:08
Default
  #7
Senior Member
 
Charles
Join Date: Aug 2016
Location: Vancouver, Canada
Posts: 138
Rep Power: 8
Marpole is on a distinguished road
That's incorrect setting. The flow can be arbitrary which causes your problem as there is a driving force outside of your model. You can measure the flow rate though or, if you have pump, you should know the flow rate from the pump specification.
Marpole is offline   Reply With Quote

Reply

Tags
boundaries condition, groovybc, reactingtwophaseeulerfoam

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
Basic Nozzle-Expander Design karmavatar CFX 20 March 20, 2016 08:44
Problem in setting Boundary Condition Madhatter92 CFX 12 January 12, 2016 04:39
Overflow Error in Multiphase Modelling with Two Continuous Fluids ashtonJ CFX 6 August 11, 2014 14:32
Question about heat transfer coefficient setting for CFX Anna Tian CFX 1 June 16, 2013 06:28
Algorithm for coupled pde with all flux boundary conditions benk Main CFD Forum 3 December 28, 2010 05:09


All times are GMT -4. The time now is 23:33.