CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Species Transport: How to determine the mass flux from concentration gradients?

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

LinkBack Thread Tools Display Modes
Old   August 12, 2013, 10:44
Post Species Transport: How to determine the mass flux from concentration gradients?
New Member
Saumitra Joshi
Join Date: Dec 2012
Posts: 8
Rep Power: 4
Zaphod'sSecondHead is on a distinguished road
Dear members,

I am modeling steady state diffusion using the species transport model for two species A & B. The geometry is a cube of air of 1 cubic centimeter with an orifice at the center of one face. The opposite face has been set as an inlet vent with defined mass fraction of species A (greater), and the lower surface of a bounded cavity beyond the orifice is set as an outlet vent to a lower mass fraction of species A (lesser).

After running the simulation, I have obtained a reasonably realistic concentration distribution of species A in the volume, i.e. I have the values of the concentration of species A at every point in the volume.

My problem is, how do I calculate the resultant rate of mass diffusion across the cavity in terms of [M][T]^(-3)?

Please help me.
Zaphod'sSecondHead is offline   Reply With Quote


concentration gradient, diffusion, mass flux, species transport

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
problems concerning mass conservativity in bubbleFoam with custom scalar transport cutter OpenFOAM Programming & Development 3 February 10, 2015 05:25
Species Mole and Mass Fraction Macro combustion FLUENT 15 October 29, 2013 04:57
Questions for a species transport problems (snapshots attached) aleisia FLUENT 2 October 9, 2011 04:40
How to specify surface flux of a species? ked FLUENT 16 February 9, 2006 21:14
total mass flux correction for compressible fluid? Francesco Di Maio Main CFD Forum 0 August 21, 2000 04:23

All times are GMT -4. The time now is 05:21.