Particle Scavenging

Above is a high speed (1000 fps) movie of a levitated drop. The ultrasonic carrier frequency (~30kHz) is being modulated at about 100Hz, causing the drop to undergo shape mode oscillations. This movie was acquired by my undergraduate researcher, Brantley Mills.

Above is a movie obtained of a larger drop showing larger oscillation amplitudes (Brantley Mills).

Above is a movie obtained under the same conditions, but with different lighting conditions (Brantley Mills).

Above is the first movie we obtained of a water drop levitated in an ultrasonic transducer. This was taken by my Ph.D. student, Jie Kou, with a commercial video camera (hand-held). The horizontal dimension of this images are about two inches. At the end of the movie, two drops can be seen levitated in the same ultrasonic standing wave field.

Above is a movie of the accretion disks which form in the ultrasonic field. Particle scavenging may be enhanced in th3ese disks.