Wed January 12th 2011
15:00
HR Z203 		Seminar Air effects in drop impacts
Christophe Josserand

Details:

In this talk, I will discuss the influence of the surrounding gas (often the air) in drop impacts. Indeed, experiments have shown recently that the air density can trigger a transition between splashing and spreading on a smooth dry surface. Although compressibility of the gas is often invoked to explain such effects, the detailed mechanism is still lacking. In this context, I will present
theoretical and numerical results obtained in the incompressible gas limit.
A scenario involving an aero-dynamical instability of the spreading film will be presented. Finally, the situation of drop impact on a thin liquid film will be discussed.
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