Experimental investigation of a single droplet impact onto a sessile drop

N. Nikolopoulos, G. Strotos, K. S. Nikas, M. Gavaises, A. Theodorakakos, M. Marengo, G. E. Cossali

Research output: Contribution to journalArticle

Abstract

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 chargecoupled 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 theWe number and the maximum thickness of the steady film, which is affected by the surface wettability properties

Original languageEnglish
Pages (from-to)909-922
Number of pages14
JournalAtomization and Sprays
Volume20
Issue number10
DOIs
Publication statusPublished - 1 Jan 2010

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Wetting
Image analysis
Contact angle
Film thickness
Cameras
Water
Liquids
Experiments

Keywords

  • Drop impact
  • Liquid film
  • Splash
  • Wettability

Cite this

Nikolopoulos, N., Strotos, G., Nikas, K. S., Gavaises, M., Theodorakakos, A., Marengo, M., & Cossali, G. E. (2010). Experimental investigation of a single droplet impact onto a sessile drop. Atomization and Sprays, 20(10), 909-922. https://doi.org/10.1615/AtomizSpr.v20.i10.70
Nikolopoulos, N. ; Strotos, G. ; Nikas, K. S. ; Gavaises, M. ; Theodorakakos, A. ; Marengo, M. ; Cossali, G. E. / Experimental investigation of a single droplet impact onto a sessile drop. In: Atomization and Sprays. 2010 ; Vol. 20, No. 10. pp. 909-922.
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Nikolopoulos, N, Strotos, G, Nikas, KS, Gavaises, M, Theodorakakos, A, Marengo, M & Cossali, GE 2010, 'Experimental investigation of a single droplet impact onto a sessile drop', Atomization and Sprays, vol. 20, no. 10, pp. 909-922. https://doi.org/10.1615/AtomizSpr.v20.i10.70

Experimental investigation of a single droplet impact onto a sessile drop. / Nikolopoulos, N.; Strotos, G.; Nikas, K. S.; Gavaises, M.; Theodorakakos, A.; Marengo, M.; Cossali, G. E.

In: Atomization and Sprays, Vol. 20, No. 10, 01.01.2010, p. 909-922.

Research output: Contribution to journalArticle

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Nikolopoulos N, Strotos G, Nikas KS, Gavaises M, Theodorakakos A, Marengo M et al. Experimental investigation of a single droplet impact onto a sessile drop. Atomization and Sprays. 2010 Jan 1;20(10):909-922. https://doi.org/10.1615/AtomizSpr.v20.i10.70