Aiming with bubbles
نویسنده
چکیده
The bubbles that form in a cavitating liquid are mostly empty voids that can accelerate the surrounding fluid to very high speeds, in some cases focusing the liquid flow into needle thin jets. The military, for example, harnesses this effect to penetrate and sink large vessels with the huge cavitation bubble created with an underwater explosion. Now, a miniaturized (and more peaceful) version of a cavitation driven jet is offering exciting new possibilities in biology. Georgii Sankin, Fang Yuan, and Pei Zhong at Duke University in the US have designed a tandem-bubble technique to poke through the membrane of a single biological cell with a micrometer sized jet. Their in-depth study, which is reported in Physical Review Letters, demonstrates that with the proper control of cavitation, it is possible to engineer complex, localized, and repeatable flows on the micrometer scale [1].
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