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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.

This study reports the work on enhancement of the oscillation of gas-liquid interface when film flows over a specific corrugation for given conditions, related to the resonance phenomenon when the free surface amplitude becomes very large. The study focuses on the factors influenced by the resonance phenomenon and the authors have revealed that the resonance section promotes the oscillation of the film surface and suppression of bottom eddies. The numerical simulations are performed with the open source software OpenFOAM, and the experiments were conducted to validate the observed and simulation results. With increase in the free surface amplitude, the upper and lower bounds of the resonance section correspond to the two inflection points of free surface amplitude while the variations of average liquid film thickness are small, and the normal velocity intensity of the free surface increases. The study may be of interest for engineering community and has some potential implications for better and efficient design of equipment intensively involved heat and mass transfer, such as a structured packing tower where the mass transfer coefficient needs to be determined.

波纹板薄膜流体共振现象的数值及实验研究

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