Mm. 1.

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DOI: 10.1121/1.4979933.1

Movement of Expancel in the chip at 164.5 kHz, 20 mVpp on the transducer. At this frequency, bubbles aggregated in the centre of the chip, where they formed a spherical cloud. While aggregating, they formed structures perpendicular to the direction of motion, due to bubble-bubble interactions (secondary Bjerknes forces). The video shows the central part of the chip, one side of the main channel and one of the angled channels and has been taken at 30 frames per second (fps). This is a file of type “mov” (1.4 Mb).