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.
|Title of host publication||Proceedings of the 3rd Micro and Nano Flows Conference, August 22-24, Thessaloniki, Greece|
|Publication status||Published - 2011|
|Event||3rd Micro and Nano Flows Conference (MNF 2011), August 22-24, 2011, Thessaloniki, Greece - Makedonia Palace Hotel, Thessaloniki, Greece|
Duration: 22 Aug 2011 → 24 Aug 2011
|Conference||3rd Micro and Nano Flows Conference (MNF 2011), August 22-24, 2011, Thessaloniki, Greece|
|Abbreviated title||MNF 2011|
|Period||22/08/11 → 24/08/11|