Bubble size distribution near a pressure antinode Free

When strong ultrasonic standing wave fields are generated in liquid‐filled resonators, cavitation bubbles emerge and build dynamic structures, typically near the pressure antinodes. For technical applications like sonochemical reactions taking place in the resonator, the size distribution of the clustering bubbles is an important parameter. New photographic measurements of bubble sizes are presented, along with numerical size estimates. These are based on Bjerknes force and shape stability calculations for spherical bubbles. [Work partially supported by ‘‘Graduiertenkolleg Strömungsinstabilität und Turbulenz.’’]