Therefore, when the residence time decreases (high values of
Vh), the transversal diffusion time is artificially reduced (high values
of D) to ensure a similar diffusion length (xDtresidence). In the
following studies, D is artificially increased from 10-9 up to 10-6
m2 s-1 for Vh ranging from 1.3 10-3 up to 1.3 m s-1. For low
values of diffusion coefficients and high values of velocity, it is
worth noting that longer residence times are required to maintain
a constant transversal diffusion length. Consequently, the microsystem
would correspond to longer channels if the velocity was
set to such high values.