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Atomization and Sprays
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ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v20.i10.70
pages 909-922

EXPERIMENTAL INVESTIGATION OF A SINGLE DROPLET IMPACT ONTO A SESSILE DROP

Nikos Nikolopoulos
Centre Of Research Technology Hellas / Institute of Solid Fuels and Technology Applications
George Strotos
Technological Education Institute of Piraeus, Mechanical Engineering Department, Fluid Mechanics Laboratory, 250 Thivon & P. Ralli str., Aegaleo, 12244, Greece
Konstantinos-Stephen P. Nikas
Technological Education Institute of Piraeus, Mechanical Engineering Department, Fluid Mechanics Laboratory, Greece
Manolis Gavaises
School of Mathematics, Computer Science, and Engineering, City University London, Northampton Square, EC1V 0HB London, United Kingdom
Andreas P. Theodorakakos
Fluid Research Co, 49 Laskareos Str, 114 72, Athens
Marco Marengo
Advanced Engineering Centre, School of Computing Engineering and Mathematics, Cockcroft Building, Lewes Road, University of Brighton, Brighton BN2 4GJ, UK; Department of Engineering, University of Bergamo, Viale Marconi 5, 24044 Dalmine (BG), Italy
Gianpietro Cossali
University of Bergamo

RÉSUMÉ

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.


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