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

gas diffusion through membrane

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 8, 2010, 08:14
Default gas diffusion through membrane
  #1
New Member
 
Join Date: Apr 2010
Location: Athens, Greece
Posts: 15
Rep Power: 7
sosat1012 is on a distinguished road
Lets say we have a box where there is a source of gas CO2 (at the bottom) and it is shut by a membrane (top). The box with the membrane is in atmospheric environment (simplest case). I want to simulate in CFX the diffusion through the membrane and finally find out the mass fractions of the air and CO2 inside the box.

I create two domains: the bottle without the membrane and the membrane itself. The first one is a fluid domain defined to contain a mixture of air (constraint) and CO2 with the kinematic diffusivity of CO2 in air.

What i did was to define the membrane domain as fluid domain containing again the CO2 and Air(constraint) mixture but with different kinematic viscocity.

There is a common area (between box domain and membrane domain) though that i do not know whether to define as a boundary or as an interphase (i did it as an interphase and the solution has errors - i get no results)

Any help on this?

What type of domain should i define the membrane?

If solid then i can not find a way to insert the diffusion coefficient of the membrane interacting with the mixture
sosat1012 is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
gas diffusion in porous media Ivan FLUENT 0 December 26, 2002 03:34
Gas pressure question Dan Moskal Main CFD Forum 0 October 24, 2002 22:02


All times are GMT -4. The time now is 15:46.