Abstract
Successive droplets deposited high-resolution features on the non-ideal recessed microchannel is investigated utilizing a 3D multiple-relaxation-time (MRT) pseudopotential lattice Boltzmann (LB) model with large density ratios and high Reynolds numbers. The non-ideal hydrophilic wettability is modeled by the geometric formulation within the pseudopotential LB framework. Firstly, for single droplet impingement on the square microchannel, three liquid morphologies including quatrefoil-like, quasi-square and quasi-rounded footprints are observed with varying aspect ratios of microchannel. Next, considering two successive droplets impingement on the rectangular microchannel, with the droplet spacings increasing, the liquid morphologies including bulging, uniform and dumbbell footprints are quantitatively identified. With the formation of connecting ridge, the optimal droplet spacing in in-phase collision mode is larger than that in out-of-phase mode. Besides, the deviations between simulations and theoretical values are observed which are attributed to the intensive inertial dominated flows. Finally, as extending to the multi-droplets deposited lines and films, the optimal droplet spacings are adaptive in both collision and placement modes for uniform and high-resolution features.
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