Abstract :
Fluid mixing is a crucial and challenging process for microfluidic systems, which
are widely used in biochemical processes. Because of their fast performance, active micromixers
that use stirrer blades are considered for biological applications. In the present study, by using a robust
and convenient Incompressible Smoothed Particle Hydrodynamics (ISPH) method, miscible mixing
within a two-blade micromixer is investigated. The problem discussed herein is represented by
an active micromixer comprising two stir-bars that rotate to mix the fluids. Because of its Lagrangian
nature, Smoothed Particle Hydrodynamics is an appropriate and convenient method for simulating
moving boundary problems and tracking the particles in the mixing process. Previous investigations
have been carried out for mixing flow for a low Schmidt number. However, a low Schmidt number
is barely applicable for liquid mixing. Hence, in the present study, the Schmidt number is considered
to be Sc=1000. The present results show that the two-blade micro-channel mixer considerably
improves the mixing rate in comparison with the one-blade micro-channel mixer
