Abstract
The paper presents the results of an experimental study of waves on falling liquid films in the range of Reynolds numbers 80 < Re < 420. Experiments were conducted using field optical diagnostic methods with high spatial and temporal resolution. On the humps of large three-dimensional waves, a generation of capillary ripples with a small wavelength was observed. As noted in the literature, it is in these areas of three-dimensional waves so-called “turbulence spots” are observed, the appearance of which is associated with a transition to a turbulent flow regime. Also long-lived rounded dimples were observed with characteristic transverse dimensions of 1–3 mm, which are formed in the interaction region of capillary precursors and then travel as independent structural elements of the flow.
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