Impalement transitions in droplets impacting microstructured superhydrophobic surfacesJ. Hyväluoma and J. Timonen
Department of Physics, University of Jyväskylä - FI-40014 Jyväskylä, Finland, EU
received 7 April 2008; accepted in final form 28 July 2008; published September 2008
published online 9 September 2008
Liquid droplets impacting a superhydrophobic surface decorated with micron-scale posts often bounce off the surface. However, by decreasing the impact velocity, droplets may land on the surface in a fakir state, and by increasing it, posts may impale droplets that are then stuck on the surface. We use a two-phase lattice Boltzmann model to simulate droplet impact on superhydrophobic surfaces, and show that it may result in a fakir state also for reasonable high impact velocities. This happens more easily if the surface is made more hydrophobic or the post height is increased, thereby making the impaled state energetically less favourable.
47.55.dr - Interactions with surfaces.
47.55.D- - Drops and bubbles.
68.08.Bc - Wetting.
© EPLA 2008