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   Accueil > Annuaire > C. Ruyer-Quil > resume-Kofman-260912

iThree-dimensional instabilities of a falling film flow

Nicolas Kofman, Sophie Mergui and Christian Ruyer-Quil

We consider a liquid film falling down an inclined plane when periodic forcing is applied at the inlet. For moderate Reynolds number, two-dimensional solitary waves are observed. If the forcing frequency is high, the waves are first nearly sinusoidal ; these waves are unstable and evolve downstream into solitary waves as a result of a secondary instability. We study experimentally the transition to 3D waves when the flow rate is increased in order to better understand the transition to surface turbulence in liquid films. We use a Schlieren method to visualize the wave patterns and measure the film height.

Dernière modification : October 01 2012, 17:17:23.