Diffusion Coefficient

A discussion forum for STANMOD users. STudio of ANalytical MODels is a software package for evaluating solute transport in porous media using analytical solutions of the convection-dispersion solute transport equation.

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Joined: Fri Feb 05, 2010 8:34 pm

Diffusion Coefficient

Post by sarahd » Fri Feb 05, 2010 8:35 pm


I am hoping to be able to use STANMOD to be able to back out diffusion coefficients from Concentration vs. distance data I have from 1-D diffusion only experiments conducted in small sandstone prisms. Should I use CXTFIT inverse? I am unsure on what to put for the parameters. I would appreciate some help with this.


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Post by ntoride » Sat Feb 06, 2010 7:44 am

CXTFIT is a program based on analytical solutions for the convection dispersion equation. If you need a pure diffusion equation, you need another solution (but it should be easy to derive the solution). Or CXTFIT can evaluate the CDE with a very small v value. An example can be found in the FIG73A project in the "Inverse" workspace. Please carefully read the CXTFIT manual as well. Nobuo

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