Figure 4: Reaction rate controls the position of maximum of tracer distribution.
From: Harnessing catalytic pumps for directional delivery of microparticles in microchambers
(a) Tracer areal concentration n/n0 as a function of the position along the channel. Decreasing rmax shifts the maximum values of n/n0 (bold markers) to the right. (b) The low reaction rates provide slower velocities, but enable fluid to flow throughout the entire domain (yellow line) and transport cargo from the left to the right wall. Vertical arrows and bold markers in b emphasize the correlation between the position of the maximum values of n/n0 (bold markers in a) and the distance at which horizontal flow speeds become low. The latter dots roughly indicate the edge of the convective vortex (shown in Fig. 3c) that drives the aggregation of the tracers into a pile.
