Vibration of a stiffened pipe filled with a bubbly liquid: analysis of resonance frequencies in function of bubble fraction
NOISE-CON ... proceedings(2021)
Abstract
The characterization of the presence of bubbles in industrial fluid circuits may be extremely important for many safety issues. It is well known that the acoustic properties of liquids can be drastically modified by a small amount of gas content in the liquid. At sufficiently low frequencies, the sound velocity depends primarily on the gas volume fraction. The variation of the gas fraction may then induce some variations in the vibroacoustic behavior of the pipe transporting the liquid. Analysis of the pipe vibrations can then help in the monitoring of the bubble presence. In such a context, the aim of this study is to show how the presence of bubbles in the liquid could affect the resonance frequencies of the pipe. A numerical vibroacoustic model has been developed to predict the vibroacoustic behavior of a stiffened cylindrical shell filled with bubbly liquid exhibiting low frequency resonances. The model is numerically verified for the shell without the liquid by a finite element simulation and then used to analyze the frequency shifts of the shell resonances in function of the void fraction.
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Key words
bubbly liquid,resonance frequencies,pipe
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