Theory Manual Version 3.4
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Section 5.8: Solute Diffusivity Up Section 5.8: Solute Diffusivity Subsection 5.8.2: Constant Orthotropic Diffusivity

### 5.8.1 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 5.8: Solute Diffusivity Up Section 5.8: Solute Diffusivity Subsection 5.8.2: Constant Orthotropic Diffusivity