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Theory Manual Version 3.6
 Section 5.10: Solute Diffusivity Up Section 5.10: Solute Diffusivity Subsection 5.10.2: Constant Orthotropic Diffusivity 

5.10.1 Constant Isotropic Diffusivity

When the permeability is isotropic, For this material model, is constant. This assumption is only true when strains are small. Note that the user must specify , where is the solute diffusivity in free solution, since a solute cannot diffuse through the biphasic-solute mixture faster than in free solution.
 Section 5.10: Solute Diffusivity Up Section 5.10: Solute Diffusivity Subsection 5.10.2: Constant Orthotropic Diffusivity