On solitary waves in periodically excited falling liquid films

Abstract eng:
We present a detailed and systematic computational and experimental study of the hydrodynamics of solitary waves on periodically excited falling liquid films. We also offer a novel scaling for inertia-dominated falling liquid films that allows for a self-similar characterisation of the shape and dispersion of solitary waves in the films and unravels the main hydrodynamic mechanisms that dominate the dynamic behaviour of such waves. Furthermore, our results yield new insight pertaining to the onset of flow recirculation in the moving frame of reference of the waves, the flow reversal due to capillary effects as well as mechanisms related to capillary ripples preceding the main solitary humps that cause a significant reduction in film height and speed.

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