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Subsubsection 3.12.2.4: Fluid Flux Up Subsection 3.12.2: Surface Loads Subsubsection 3.12.2.6: Heat Flux

#### 3.12.2.5 Solute Flux

The molar flux of solute relative to the solid matrix is given by the vector . Since solute viscosity is not explicitly modeled in a biphasic-solute material, the tangential component of on a boundary surface may not be prescribed. Only the normal component of the relative solute flux, , represents a natural boundary condition. To prescribe a value for on a surface, use:
<surface_load type="soluteflux" surface="surface1">
<flux lc="1">1.0</flux>
<linear>0</linear>
<solute_id>1</solute_id>