Experimental investigation into the flow of liquid film under saturated steam condition on a vibrating surface

Experimental and Theoretical Study of Solitary-like Wave Dynamics of Liquid Film Flows over a Vibrated Inclined Plane

“…Subsequently, high-amplitude vibrations result in an increase in the film thickness and a concomitant increase in the speed of the waves. However, the opposite conclusions were drawn in [40], which is, most likely, a result of the differences in the system (a liquid film under two-phase flow conditions) investigated in that paper. It is also well-known that in horizontal liquid layers a harmonic vibration excites two different types of standing surface waves: harmonic waves that oscillate at the vibration frequency and subharmonic waves that oscillate at the half of the vibration frequency [51].…”

“…For instance, they can merge instead of passing through each other without significant change, with the latter being the case of two solitary waves governed by the well-known KdV equation [3,32]. The analysis of solitary-like surface waves in flowing liquid films is also important because liquid films, as well as similar physical systems [33][34][35], are often encountered in the fields of earth and planetary sciences [36,37] and in technological processes [38], where the liquids of interest can also experience temperature gradients [14,28] and vibrations [39][40][41]. Given this, the effect of vibrations on the wave dynamics of film flows has become an independent subject of fundamental and applied research [42][43][44][45][46].…”

“…Although, traditionally, greater attention has been paid to the wave dynamics on freefalling vertical liquid films [13,14], studies of surface waves on liquid films flowing over slightly inclined planes have also been conducted given an essentially the same physics as in the case of vertical systems [24,42]. However, reports on experimental results involving the effect of vibrations are rather scarce and scattered in the literature sources [39,40,45]. In particular, in [39] it has been shown that the vibration of a horizontal tube with a liquid thin film flowing over it results in the appearance of ripple waves at the vibration frequency.…”