2009/11/01 by Masato Ida · 43 citations
Engineering · Materials Science · Physics and Astronomy · #Ambient pressure #Bubble #Cavitation #Cavitation Phenomena in Pumps #Critical radius #Explosive material #RADIUS #Ultrasound and Cavitation Phenomena #Ultrasound and Hyperthermia Applications #Wake #physics.comp-ph #physics.flu-dyn
paper · pdf · doi:10.1063/1.3265547
published in Physics of Fluids 21(11) (American Institute of Physics) · 14 pages, 16 figures, RevTEX4
openalex publication_date 2009/11/01 · arxiv created 2009/11/27 · arxiv updated 2009/12/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The inception of cavitation in multibubble cases is studied numerically and theoretically to show that it is different from that in single-bubble cases in several aspects. Using a multibubble model based on the Rayleigh–Plesset equation with an acoustic interaction term, we confirmed that the recently reported suppression of cavitation inception due to the interaction of nonidentical bubbles can take place not only in liquid mercury but also in water, and we found that a relatively large bubble can significantly decrease the cavitation threshold pressure of a nearby small bubble. By examining in detail the transition region where the dynamics of the suppressed bubble changes drastically as the interbubble distance changes, we determined that the explosive expansion of a bubble under negative pressure can be interrupted and turn into collapse even though the far-field liquid pressure well exceeds the bubble’s threshold pressure. Numerical results suggest that the interruption of expansion occurs when the bubble radius is exceeded by the instantaneous unstable equilibrium radius of the bubble determined using the total pressure acting on the bubble. When we extended the discussion to systems of larger numbers of bubbles, we found that a larger number of bubbles have a stronger suppression effect. The present findings would be useful in understanding the complex behavior of cavitation bubbles in practical applications where, in general, many cavitation nuclei exist and may interact with each other.