Different calculations for the optimal zigzag channel featuring
s ) 400 ím are achieved for different Reynolds numbers and are
reported in Table 1. As in the precedent calculations, diffusion
coefficients are adapted to ensure a constant Peclet number.
Different values of mixing efficiencies are represented versus the
Reynolds numbers in Figure 5. Two different mixing behaviors
are illustrated. For Reynolds numbers 80 (Vh g 4 10-1 m s-1) inducing recirculations, the mixing
efficiency greatly increases up to 98.6%. As discussed previously,
the channel wall after each angle acts as an obstacle redirecting
the flow. The inertial effects induce a convergence of the flow
lines along these walls and an increase of the local velocity, as
shown in Figures 4a and 6a.