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

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Old   August 12, 2013, 10:44
Post Species Transport: How to determine the mass flux from concentration gradients?
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Saumitra Joshi
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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.
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concentration gradient, diffusion, mass flux, species transport

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