The effect of surfactant monolayers on vortex rings formed from an impacting water drop

Details The effect of surfactant monolayers on vortex rings formed from an impacting water drop The effect of surfactant monolayers on vortex rings formed from an impacting water drop

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phfl...15.2852s&link_type=abstract

Physics of Fluids, Volume 15, Issue 10, pp. 2852-2863 (2003).

Physics

1

Langmuir-Blodgett Films On Liquids, Liquid Thin Films, Chemisorption/Physisorption: Adsorbates On Surfaces, Surfactants, Micellar Solutions, Vesicles, Lamellae, Amphiphilic Systems

Scientific paper

The impact of a falling drop with a flat liquid surface can result in the formation of a subsurface vortex ring that penetrates a significant distance into the liquid bulk. Herein an experimental study of these vortex rings is presented for water drops striking a water surface. The effect of surfactant monolayers was investigated by measuring the vortex velocity for water surfaces that were free of surfactants, as well as surfaces covered with surfactant monolayers. A soluble and an insoluble monolayer were investigated, Triton X-100 and oleyl alcohol, respectively. Oleyl alcohol was investigated for concentrations ranging from 0 to 0.495 μg/cm2, and Triton X-100 was investigated for concentrations ranging from 0 to 4.0 mg/L. For both surfactants the vortex velocity displayed a maximum at intermediate surfactant concentrations. In all cases the drop fluid was free of surfactants. A possible mechanism based on capillary wave damping is presented to explain these results. The relevance of this work to rain over lakes and oceans is discussed.

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