Destabilization and dry-spot nucleation in thin liquid films on partially wetting substrates using a low-pressure air-jet

C.W.J. Berendsen, J.C.H. Zeegers, A.A. Darhuber

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    The rupture of a thin liquid film on a partially wetting substrate can be initiated by external forces. In this manuscript we present experiments and numerical simulations of the effects of a laminar axisymmetric air-jet impinging on triethylene glycol films. We numerically calculate stagnation pressures and shear stress distributions that are used in a model for the thin liquid film dynamics. Experimentally, we distinguish three regimes: 1) the depressions made by low pressure air-jets level out, 2) for intermediate pressures a single dry-spot is nucleated that grows with a constant dewetting speed, whereas 3) for higher pressure air-jets the film is thinned and a large number of dry-spots nucleate, grow and leave a droplet pattern behind. In the third regime the dewetting speed was not independent of local film thickness. Numerical simulations show a qualitative agreement with the experimental observations.
    Original languageEnglish
    Title of host publicationProceedings of the 3rd Micro and Nano Flows Conference, August 22-24, Thessaloniki, Greece
    Pages1-8
    Publication statusPublished - 2011
    Event3rd Micro and Nano Flows Conference (MNF 2011), August 22-24, 2011, Thessaloniki, Greece - Makedonia Palace Hotel, Thessaloniki, Greece
    Duration: 22 Aug 201124 Aug 2011
    http://www.mnf2011.com/

    Conference

    Conference3rd Micro and Nano Flows Conference (MNF 2011), August 22-24, 2011, Thessaloniki, Greece
    Abbreviated titleMNF 2011
    CountryGreece
    CityThessaloniki
    Period22/08/1124/08/11
    Internet address

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