CFD Online Logo CFD Online URL
Home > Forums > FLUENT

mass transfer from fluids to membrane

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

Like Tree1Likes
  • 1 Post By Peter

LinkBack Thread Tools Display Modes
Old   August 2, 2002, 14:27
Default mass transfer from fluids to membrane
Posts: n/a

I have some difficulty in modeling mass transfer in a membrane separation process. My question is: how to couple mass diffusion in a solid-like (not porous) membrane with mass transfer near the membrane surface?

1. Case description. Binary Fluid (with species B dissolved in water) flowing through a flat slit (2mm high, 20mm wide, 190 mm long). The bottom of this rectangular geometry is a nonporous membrane. Species B will be PREFERENTIALLY permeate through membrane to reach the other side of membrane where a high vacuum is applied.

I use Gambit and Fluent 6. The difficulties I encounted included:

1) Fluent can just take membrane as SOLID, in this way I have no way to input diffusivity of B within membrane. Membrane in this case is still( not moving), yet it is not impermeable solid like steel.

2) How much B should go into membrane should be determined by concentration of B at membrane surface in contace with fluid. As Fluent seems to provide no model for mass diffusion in solid, I compromised to used surface reaction deposition model for this purpose. But in this way, the reaction rate is pretty arbitrary, though I can finally deterine the correct value by error-and-trial approach to let flux from fluid into membrane be the same as the flux through membrane to vacuum.

Thanks for your help,


sunshine8930 likes this.
  Reply With Quote


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
mass transfer in ANSYS thipps ANSYS 1 August 29, 2013 11:05
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
mass transfer coefficient for boundary condition niek Main CFD Forum 0 March 29, 2011 05:33
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
additional variable mass transfer in CFX5.6 john CFX 1 February 14, 2004 01:30

All times are GMT -4. The time now is 05:47.