Posted Tue, 26 Jan 2016 20:37:50 GMT by Christina Haberer Project Engineer
I am new to IFM programming ... Does anyone have an idea how to implement the competitive Langmuir isotherm in Feflow via IFM-Plugin or dealt with a similar problem? At equilibrium the competitive Langmuir isotherm describes the concentration at the solid phase for two species in the following form:

[b]Cs(species 1) = k1*Cf(species 1)/(1+k2*Cf(species 1)+ k3*Cf(species 2))
Cs(species 2) = k4*Cf(species 2)/(1+k2*Cf(species 1)+ k3*Cf(species 2))
with k1 to k4 being the parameters of the Langmuir isotherm and Cs and Cf being the concentrations in the solid and in the fluid phase, respectively.

Thanks a lot for your help and best regards.
Posted Thu, 04 Feb 2016 13:33:30 GMT by Björn Kaiser
The formulation you indicated differs from the formulation implemented in FEFLOW. Unfortunately, IFM does not provide an option to introduce the formulation you are interested in. A possible alternative is the two-site equilibrium/kinetic sorption with degradation as described in
<a href="">White Paper IV (Chapter 1.8.3 page 44)</a>

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