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We study the time evolution and driven motion of thin liquid films lying ontop of chemical patterns on a substrate. Lattice-Boltzmann and moleculardynamics methods are used for simulations of the flow of microscopic andnanoscopic films, respectively. Minimization of fluid surface area is used toexamine the corresponding equilibrium free energy landscapes. The focus is onmotion across patterns containing diverging and converging flow junctions, withan eye towards applications to lab-on-a-chip devices. Both open liquid-vaporsystems driven by body forces and confined liquid-liquid systems driven byboundary motion are considered. As in earlier studies of flow on a linearchemical channel, we observe continuous motion of a connected liquid filmacross repeated copies of the pattern, despite the appearance of pearlinginstabilities of the interface. Provided that the strength of the driving forceand the volume of liquid are not too large, the liquid is confined to thechemical channels and its motion can be directed by small variations in thegeometry of the pattern.

Micro- and nanoscale fluid flow on chemical channels