[en] When a low viscosity oil droplet is laid onto the surface of a high viscosity oil liquid, it
stays at rest for a moment before coalescence. The coalescence can be delayed and sometimes
inhibited by injecting fresh air under the droplet. This can happen when the surface of the
bath oscillates vertically. In this case the droplet basically bounces on the interface [1, 2].
We observe that the conditions for bouncing depends on the frequency, more precisely we
observe resonance when the eigenfrequency of the droplet is excited. Lord Rayleigh expressed
the droplet deformation modes in terms of spherical harmonics Y m. We present different l
experimental mode of deformation with the corresponding spherical harmonic model. In some conditions, a droplet presents a non axi-symmetric mode of deformation. That leads to a rotation of the droplet and to a horizontal displacement.
Disciplines :
Physics
Author, co-author :
Terwagne, Denis ; Université de Liège - ULiège > Département de physique > Physique statistique
Dorbolo, Stéphane ; Université de Liège - ULiège > Département de physique > Physique statistique
Vandewalle, Nicolas ; Université de Liège - ULiège > Département de physique > Physique statistique
Gilet, Tristan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Micro mécanique
Language :
English
Title :
The amazing bouncing droplet
Publication date :
November 2008
Number of pages :
video presentation
Event name :
61st APS Division of Fluid Dynamics Meeting
Event organizer :
American Physical Society, Division of Fluid Dynamics
