Vibration of a stiffened pipe filled with a bubbly liquid: analysis of resonance frequencies in function of bubble fraction

The characterization of the presence bubbles in industrial fluid circuits may be extremely important for many safety issuses. It is well known that acoustic properties liquids can drastically modified by a small amount gaz content liquid. At sufficiently low frequencies, speed sound depends primarily on gas volume fraction. variation fraction then induce some variations vibroacoustic behavior pipe transporting Analysis vibrations help monitoring bubble presence. In such context, aim this study to show how liquid could affect resonance frequencies pipe. A numerical vibroacoustical model has been developed predict stiffened cylindrical shell filled with bubbly exhibiting frequency resonances. model, experimentally verified well-characterized liquid, used analyse shifts resonances function bubble. Keywords : pipe, heavy fluid, modelling, circumferential admittance approach, shell, frequency, void