Experimental study on boiling induced vibration excited by a single bubble

In order to investigate the corresponding relationship between bubble behaviors and vibration responses and acquire the main excitation mechanisms for boiling induced vibration, experiments for a single bubble boiling on a vertical heating surface were conducted. The dynamic behaviors of the bubble and the vibration response signals of the heating surface are simultaneously measured using a high-speed camera and a Laser Doppler Vibrometer. For saturated boiling conditions, the bubble initiates, grows, slides on the heating surface and departs from the wall. For subcooled boiling conditions, condensations occur when the bubble contacts with the subcooled water and the bubble collapses near the wall after departure. The vibration responses corresponding to a single boiling bubble indicate that the main excitation mechanism is the pressure fluctuations generated during the initial stage of the rapid vapor bubble growth. Besides, the effects of bubble condensation and collapse are enhanced with the increase of ΔTsub. The vibration responses increase with the increase of ΔTsup and the decrease of ΔTsub. The increase in ΔTsub and ΔTsup can make the distribution of the corresponding vibration response in the frequency domain shift to higher frequencies.