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Modelling drops on micropatterned surfaces

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We discuss the use of free energy lattice Boltzmann algorithms as tools to investigate multiphase flow at surfaces with chemical and topographic patterning. Putting together arguments based on the Gibbs criterion for interface pinning and the numerical approaches, we show how capillary filling and imbibition can be controlled by surface patterning. We then consider the link between patterned surfaces and superhydrophobic behaviour and discuss the extent to which the dynamics of drops rolling across superhydrophobic surfaces is understood. We identify a novel, partially suspended, superhydrophobic state and suggest an interpretation of the anisotropic motion of water drops on butterfly wings.

This talk is part of the Fluid Mechanics (DAMTP) series.

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