For the hydrodynamic calculations, a parabolic Poiseuille
profile is assumed at both inlet boundaries. In addition, the fluid
velocity is fixed to 0 along the wall boundaries (no slip conditions),
and a free condition is assumed at the outlet boundary. Regarding
the boundary conditions for the concentration calculations, the
parameter c is imposed as 0 at one inlet and as 1 at the other
one. In addition, the values of the density and the dynamic viscosity
are the following: