Abstract: The oscillation of gas–liquid interface is enhanced when film flows over a specific corrugation under certain flow conditions. The resonance phenomenon occurs when the free surface amplitude reaches its maximum. In this study, the resonance section is proposed for the first time in which the oscillation of the film surface is enhanced and bottom eddies are suppressed. The trend of the bottom eddies inspires the discovery of the resonance section. The dynamic characteristics of the resonance phenomenon were analyzed by simulations and experiments. The numerical simulations were performed with the open source software OpenFOAM, and the experiments were conducted by the particle image velocimetry (PIV) method. In the resonance section, the dynamic characteristics are different from the other sections: the upper and lower bounds of the resonance section correspond to the two inflection points of free surface amplitude, the variations in average liquid film thickness are slight, and the normal velocity intensity of the free surface is increased. Additionally, the enhancement of velocity intensity occurs within a region.

Key words: Film flow; Resonance section; OpenFOAM; Particle image velocimetry (PIV); Corrugated plate

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