The present work focuses on laminar dispersion of solutes in
finite-length patterned microtubes. Dispersion is strongly influenced
by axial flow variations caused by patterns of periodic pillars
and gaps in the flow direction. We focus on the Cassie Baxter
state where the gaps are filled with with air pockets and thus
free-slip boundary conditions apply at the liquid-air interface.
The analysis of dispersion in a finite-length microtube is approached
by considering the temporal moments of solute concentration.
With this approach it is possible to investigate the
dispersion properties at low and high Peclet numbers and therefore
how the patterned structure of the microtube influences both
the Taylor-Aris and Convection-dominated dispersion regimes.
Numerical results for the velocity field and for the moment hierarchy
are obtained by means of Finite Element Method (Comsol
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.