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Journal of Applied Mechanics and Technical Physics

2020 year, number 3

Experimental Study of Three-Dimensional Wave Formation from a Solitary Two-Dimensional Wave on Vertically Falling Liquid Films

A. V. Bobylev, V. V. Guzanov, A. Z. Kvon, S. M. Kharlamov, D. M. Markovich
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
Keywords: пленка жидкости, уединенная волна, неустойчивость в поперечном направлении, трехмерная волна, лазерно-индуцированная флюоресценция, liquid film, solitary wave, transverse instability, three-dimensional wave, laser-induced fluorescence

Abstract

The transformation of a solitary two-dimensional wave into three-dimensional waves on a falling liquid film was studied using the high-speed method of laser-induced fluorescence allowing high spatial and temporal resolution, which allows measuring the thickness of liquid films with high spatial and temporal resolution, the process of decay of a solitary two-dimensional wave into three-dimensional waves in case of film flow along a vertical plate. It was shown that the package of three-dimensional waves resulting from the decay of a solitary two-dimensional wave had a strong perturbing effect on the falling film and leads to the formation of rivulets on its surface.