Mass Sources and Sinks
To compute the mass flux of a species, ni (SI unit: kg/(m2·s)), the molar flux is multiplied by the molar mass, Mi (SI unit: kg/mol), resulting in
for a mass flux boundary, and
for a porous source term.
In the Transport of Concentrated Species interface, where a nonconservative formulation of the flux equations are used, the source term is corrected for the mass change in the species transporting phase according to
(4-55)
Equation 4-55 is for a domain source only, the flux expression over a boundary is not changed for a nonconservative formulation.