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

which solver to model a falling film with mass transfer ?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 26, 2010, 13:36
Arrow which solver to model a falling film with mass transfer ?
  #1
Cyp
Senior Member
 
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18
Cyp is on a distinguished road
Hi everybody!

I need to model the diffusion in a falling film along a wall. My system is a 2 phases flow (Gas + Liquid), however in a first time I will assume that the gas velocity is null. I suppose my interfacial condition is controled by Henry's law.

which solver can i use to simulate my problem ??

Thank you for helping
Cyp is offline   Reply With Quote

Old   March 28, 2010, 03:56
Default
  #2
Senior Member
 
Holger Marschall
Join Date: Mar 2009
Location: Darmstadt, Germany
Posts: 125
Rep Power: 19
holger_marschall is on a distinguished road
Send a message via Skype™ to holger_marschall
Quote:
Originally Posted by Cyp View Post
Hi everybody!

I need to model the diffusion in a falling film along a wall. My system is a 2 phases flow (Gas + Liquid), however in a first time I will assume that the gas velocity is null. I suppose my interfacial condition is controled by Henry's law.

which solver can i use to simulate my problem ??

Thank you for helping
Hi Cyp,

well, did you have a look at
H. Raach and S. Somasundaram,
NUMERICAL INVESTIGATIONS ON HEAT TRANSFER IN
FALLING FILMS AROUND TURBULENCE WIRES,
5th European Thermal-Sciences Conference, The Netherlands, 2008
This work is based on interFoam. I think he is calling his extended solver thinterfoam as it is an extension of interfoam meaning "thermal interfoam". So you can base your settings upon this work. Have you already performed preliminary simulations looking at the fluid dynamics of a falling film? This might be the first step...

Unfortunatelly, there is no model currently implemented that accounts for the species transfer across the gas-liquid free-surface (steep concentration gradient approaching the interface + jump of species concentration due to different solubilities), as this is represented by a continuous interface approach - interface with interfacial width, smooth transition of bulk properties, etc..
I want to give some presentation on this on the next OpenFOAM workshop. The code snippet is also planned for release within OpenFOAM-extend after I validated it a bit more .
__________________
Holger Marschall
web: http://www.holger-marschall.info
mail: holgermarschall@yahoo.de
holger_marschall is offline   Reply With Quote

Old   April 6, 2010, 08:35
Default
  #3
Cyp
Senior Member
 
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18
Cyp is on a distinguished road
thank you for your answer.

I read the paper you advise me. It looks close to my problem. In my case, we will only consider a smooth film (instead of wavy film)

what do you mean by "Have you already performed preliminary simulations looking at the fluid dynamics of a falling film? This might be the first step..." ?? I have determined simple analytical solution for the falling liquid flow. So you think I could use the interfoam solver and imposed my analytical velocity field ?

In fact, in my work, I need to evaluate a model of my own by comparison with this falling film test cases (evaluation, mass exchange coefficient, mass exchange rate, effective dispersion coefficient at large scale...)

What is the "code snippet" ? (sorry for my questions... but I am just starting with OpenFoam...)

Thank you again for helping
Cyp is offline   Reply With Quote

Old   April 6, 2010, 15:37
Default
  #4
Senior Member
 
Holger Marschall
Join Date: Mar 2009
Location: Darmstadt, Germany
Posts: 125
Rep Power: 19
holger_marschall is on a distinguished road
Send a message via Skype™ to holger_marschall
Hi Cyp,

Quote:
Originally Posted by Cyp View Post
thank you for your answer.
You are welcome

Quote:
Originally Posted by Cyp View Post
what do you mean by "Have you already performed preliminary simulations looking at the fluid dynamics of a falling film? This might be the first step..." ?? I have determined simple analytical solution for the falling liquid flow. So you think I could use the interfoam solver and imposed my analytical velocity field ?
Well, interFoam is based on the so called one-fluid assumption resulting in a mixture model. You might have first a look if interFoam succeeds in reproducing the right fluid dynamic behavior of a falling film (since this is a free-surface flow, large density and viscosity ratios).

Quote:
Originally Posted by Cyp View Post
In fact, in my work, I need to evaluate a model of my own by comparison with this falling film test cases (evaluation, mass exchange coefficient, mass exchange rate, effective dispersion coefficient at large scale...)
Are we talking about mass transfer (evaporation/condensation) or species transfer (dilute chemical component, neglect of mass exchange)?

Quote:
Originally Posted by Cyp View Post
What is the "code snippet" ? (sorry for my questions... but I am just starting with OpenFoam...)
No problem... That is simply a piece of code.

best,
__________________
Holger Marschall
web: http://www.holger-marschall.info
mail: holgermarschall@yahoo.de
holger_marschall is offline   Reply With Quote

Old   April 6, 2010, 16:55
Default
  #5
Cyp
Senior Member
 
Cyprien
Join Date: Feb 2010
Location: Stanford University
Posts: 299
Rep Power: 18
Cyp is on a distinguished road
Hi!

Indeed, we are talking about mass transfer (condensation, evaporation...).

According to your remarks, interFoam does not seem to be the most suitable solver for my case.

Perhaps I should carry out a DNS (That seems closer to what I need):
- a convection-diffusion equation in the liquid phase
- a convection-diffusion equation in the gas phase
- a Henry's law at the interface

As velocity field, I use an analytical Poiseuille flow in the liquid phase.

Should I create my own solver ??

Regards,
Cyp
Cyp is offline   Reply With Quote

Old   April 10, 2014, 09:39
Default
  #6
New Member
 
Bora
Join Date: Dec 2010
Posts: 8
Rep Power: 15
Boreas is on a distinguished road
Hi Cyp,

Did you modelled your Falling Film? If yes I have questions for you
Boreas is offline   Reply With Quote

Old   April 15, 2014, 09:56
Default
  #7
Senior Member
 
Dongyue Li
Join Date: Jun 2012
Location: Beijing, China
Posts: 838
Rep Power: 17
sharonyue is on a distinguished road
Hi Guys,

I just run into this: http://web.student.chalmers.se/group...SlidesOFW5.pdf

I dont do research on liquid film, but Im wondering why interFoam can not deal with liquid film? If I refine the mesh aside the wall, why interfoam isnot suitable for liquid film? Thanks.
sharonyue is offline   Reply With Quote

Old   April 7, 2015, 19:53
Default
  #8
New Member
 
Mustafa Kadhim
Join Date: Mar 2015
Posts: 2
Rep Power: 0
Mak mak is on a distinguished road
Can anyone help me in simulating the heat and mass transfer in the falling liquid film over vertical surface with an air flow? (the temperature of the vertical surface is kept constant below the saturation temperature of the water)
Mak mak is offline   Reply With Quote

Reply

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
Error message: Insufficient Catalogue Size Paresh Jain CFX 32 February 3, 2021 04:37
Mass Transfer Model in FLUENT Saturn FLUENT 3 March 2, 2010 05:17
mass transfer by source panneerselvam.R CFX 7 July 12, 2005 11:07
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55
compressible two phase flow in CFX4.4 youngan CFX 0 July 2, 2003 00:32


All times are GMT -4. The time now is 03:00.