We study the influence of the surrounding gas in the dynamics of drop impact on a smooth surface. We use an axisymmetric model for which both the gas and the liquid are incompressible; lubrication regime applies for the gas film dynamics and the liquid viscosity is neglected. In the absence of surface tension a finite time singularity whose properties are analysed is formed and the liquid touches the solid on a circle. When surface tension is taken into account, a thin jet emerges from the zone of impact, skating above a thin gas layer. The thickness of the air film underneath this jet is always smaller than the mean free path in the gas suggesting that the liquid film eventually wets the surface. We finally suggest an aerodynamical instability mechanism for the splash.
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September 2011
Letter|
September 19 2011
Curvature singularity and film-skating during drop impact
Laurent Duchemin;
Laurent Duchemin
1
IRPHE, CNRS & Aix-Marseille Université
, 49 rue Joliot-Curie, 13013 Marseille, France
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Christophe Josserand
Christophe Josserand
2
Institut D’Alembert, CNRS & UPMC (Univ. Paris 06)
, UMR 7190, Case 162, 4 place Jussieu, F-75005 Paris, France
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Physics of Fluids 23, 091701 (2011)
Article history
Received:
June 04 2011
Accepted:
August 26 2011
Citation
Laurent Duchemin, Christophe Josserand; Curvature singularity and film-skating during drop impact. Physics of Fluids 1 September 2011; 23 (9): 091701. https://doi.org/10.1063/1.3640028
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