Rashidian HBroom MWillmott GRSellier M2021-03-262021-03-262020Rashidian H, Broom M, Willmott GR, Sellier M (2020). Effects of a microscale ridge on dynamic wetting during drop impact. Journal of the Royal Society of New Zealand. 50(4). 523-537.0303-67581175-8899https://hdl.handle.net/10092/101729High-speed imaging of water drop impacts on a polymer surface have been used alongside two-dimensional Lattice Boltzmann simulations to investigate the conditions under which a spreading lamella submerges a small surface ridge. Three basic outcomes have been observed when the lamella comes into contact with the ridge: pinning, wetting and splashing. The effects of Weber number and the dimensionless distance between the impact point and the ridge are investigated, and a phase portrait of the different wetting outcomes is presented. For each of the potential outcomes, a side-by-side comparison of experimental and numerical results can be made. An energy balance approach is used to study the transitions between the different outcomes.enAll rights reserved unless otherwise statedDrop impactSurface ridgeDrop wettingHigh-speed photographyLattice Boltzmann methodJournal Article2020-07-28http://doi.org/10.1080/03036758.2019.1706587