The superhydrophobicity of the microchannels are dependent not only upon the surface energy of the wall but also closely related to the micro- and/or nano-structures on their surfaces. Recent experiments have found that superhrydrophobic surfaces can be achieved by pattering roughness on hydrophobic surfaces. In this paper, the wettability of droplet on microchannel with different wettability and surface micro-structures is numerically studied by using lattice Boltzmann method (LBM). In particular, the effects of different kinds of surface micro-structures on the superhydrophobicity are analyzed. The simulation results show that the surface micro-structures have a significant influence on the wettabiltiy on the solid surfaces. Also, the results have manifested that LBM has a good application prospect in the study of wettability in micro- or nano-channels.

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