The study of bubbles and their dynamics under acoustic driving follows many applications in the biological, pharmaceutical, and medical fields. When hit by a travelling pressure waves such as acoustic transients or ultrasound waves, they sometimes can produce needle-like high-speed jets in the direction of the wave propagation as a result of local flow-focusing. To better understand this phenomenon and its implication to the various relevant applications where such jets may offer a fluidic transport mechanism, we experimentally study acoustically collapsed micro-bubbles and the resulting micro-fluidic flows at a wide range of scales using ultra-high-speed measurements.
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