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- W2020167400 abstract "We perform a joint numerical and experimental study to systematically characterize the motion of 30 $ensuremath{mu}mathrm{l}$ drops of pure water and of ethanol in water solutions, sliding over a periodic array of alternating hydrophobic and hydrophilic stripes with a large wettability contrast and a typical width of hundreds of microns. The fraction of the hydrophobic areas has been varied from about 20% to 80%. The effects of the heterogeneous patterning can be described by a renormalized value of the critical Bond number, i.e., the critical dimensionless force needed to depin the drop before it starts to move. Close to the critical Bond number we observe a jerky motion characterized by an evident stick-slip dynamics. As a result, dissipation is strongly localized in time, and the mean velocity of the drops can easily decrease by an order of magnitude compared to the sliding on the homogeneous surface. Lattice Boltzmann numerical simulations are crucial for disclosing to what extent the sliding dynamics can be deduced from the computed balance of capillary, viscous, and body forces by varying the Bond number, the surface composition, and the liquid viscosity. Beyond the critical Bond number, we characterize both experimentally and numerically the dissipation inside the droplet by studying the relation between the average velocity and the applied volume forces." @default.
- W2020167400 created "2016-06-24" @default.
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- W2020167400 date "2014-01-17" @default.
- W2020167400 modified "2023-10-14" @default.
- W2020167400 title "Sliding drops across alternating hydrophobic and hydrophilic stripes" @default.
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- W2020167400 doi "https://doi.org/10.1103/physreve.89.012406" @default.
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