RT Journal Article ID 3dfed6f32512035e A1 Nikolopoulos, Nikos A1 Strotos, George A1 Nikas, Konstantinos-Stephen P. A1 Gavaises, Manolis A1 Theodorakakos, Andreas P. A1 Marengo, Marco A1 Cossali, Gianpietro T1 EXPERIMENTAL INVESTIGATION OF A SINGLE DROPLET IMPACT ONTO A SESSILE DROP JF Atomization and Sprays JO AAS YR 2010 FD 2011-02-23 VO 20 IS 10 SP 909 OP 922 K1 drop impact K1 wettability K1 splash K1 liquid film AB This paper presents an experimental study of the impact of a single water droplet onto a stationary liquid bulk built by the previous impact of one or two droplets. The experiments were performed with two different film thicknesses, three different Weber (We) numbers, and two surface contact angles. In both cases we have hydrophilic conditions, which do not allow for a good investigation of this parameter. The morphology of the drop impact was studied using a charge-coupled device (CCD) camera, and the corresponding qualitative and quantitative characteristics regarding the time evolution of the phenomena, such as the diameter and height of the evolving crown, were obtained by image analysis. Analysis of the experimental data evidences that the phenomenon has a strong similarity to the impact of a single drop on shallow films, although the effect of the surface wetting characteristics plays, in this case, a negligible role. The regimes of deposition and splashing are identified as a function of the We number and the maximum thickness of the steady film, which is affected by the surface wettability properties. PB Begell House LK https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,706691d14834697d,3dfed6f32512035e.html