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We present an experimental study about drops sliding down inclined surfaces tilted by different angles. The dynamics of water drops on chemically heterogeneous patterns formed by hydrophilic and hydrophobic domains of different shape (stripes, squares and triangles) arranged in different patterns is found to show a rich phenomenology [1-3]. Similar measurements have been extended to non-newtonian drops moving on homogeneous surfaces. The corresponding results indicate significant differences with respect to water drops at high inclination angles [4]. In both cases, the experimental results have been completed and confirmed by lattice Boltzmann simulations. References [1] Varagnolo, S. et al, Stick-Slip Sliding of Water Drops on Chemically Heterogeneous Surfaces, Phys. Rev. Lett . 111, 066101 (2013) [2] Sbragaglia, M. et al, Sliding drops across alternating hydrophobic and hydrophilic stripes, Phys. Rev. E 89, 012406 (2014) [3] Varagnolo S. et al, Tuning drop motion by chemical patterning of surfaces, Langmuir 30, 2401−2409 (2014) [4] Varagnolo S. et al, Sliding of viscoelastic non-newtonian droplets, in preparation |