# Henry's law as boundary condition at an liquid/gas interface

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 April 13, 2010, 09:17 Henry's law as boundary condition at an liquid/gas interface #1 Senior Member   Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 258 Rep Power: 11 Sponsored Links hi everybody, I need to apply Henry's law (Cl=H*Cg) at the interface between liquid and gas phases. In the documentation it is said that the primitive types "calculated" is for "boundary field phi derived from other fields". Is it this type I have to use ? How does it work ?? Thank you for your help, Cyprien wayne14 likes this.

 April 18, 2010, 17:40 #2 Senior Member   Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 258 Rep Power: 11 Hi ! Anybody can advise me ?? In fact, I would like to add 2 transport scalar equations in the interFoam solver (for Cg and Cl). These concentrations are linked at the interface by Henry's law (Cg=H*Cl) and the equality of the flux. I know how to add the 2 equations, but I have no idea about the BC treatment at the interface......

April 19, 2010, 02:06
#3
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Holger Marschall
Join Date: Mar 2009
Posts: 124
Rep Power: 12
Quote:
 Originally Posted by Cyp I know how to add the 2 equations, but I have no idea about the BC treatment at the interface......
Hi Cyp,

this is not possible, since interFoam is based upon a so called immersed interface concept, meaning that the the interface between different immiscible fluids is embedded or immersed into the interior of the computational domain rather than aligning it to the computational grid boundaries.

So you either need a model which mimics the boundary condition at the interface or you should use interTrackFoam which is a free surface deforming mesh solver, developed at FSB Zagreb by dr. Zeljko Tukovic that would allow a b.c. to be imposed at the interface
(http://openfoamwiki.net/index.php/Co...interTrackFoam).

Hope that helps,
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Holger Marschall
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Last edited by holger_marschall; April 19, 2010 at 02:08. Reason: added link

 April 19, 2010, 04:39 #4 Senior Member   Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 258 Rep Power: 11 Hi Holger ! Thank you for your answer. I had a look on your link. It seems good for me. However, in my problem, I consider a fixed interface. So, I can uncouple the hydrodynamic and the mass transfer. It is ok for the hydrodynamic (moreover, I have an analytical solution for the velocity profile). For the mass transfer, how could the BC be imposed at the fixed "interface" ? I haven't found any docs about that...* Cyp

April 19, 2010, 05:00
#5
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Holger Marschall
Join Date: Mar 2009
Posts: 124
Rep Power: 12
Quote:
 Originally Posted by Cyp However, in my problem, I consider a fixed interface. So, I can uncouple the hydrodynamic and the mass transfer.
Hi,

in this case have a look at solvers with multi-domain support (i.e. for conjugate heat transfer). These should provide all functionality you need.

A few links to start from:
- http://www.cfd-online.com/Forums/ope...-openfoam.html
- http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2008/chtFoam.pdf

Hope that helps.

best,
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Holger Marschall
web: http://www.holger-marschall.info
mail: holgermarschall@yahoo.de

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