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High-Speed Microjets

Small jets of liquid are useful in numerous applications, such as inkjet printing, eye surgery and for cleaning of solid surfaces. How can one generate very small and fast-moving jets? In this talk we will show ultra-high-speed video imaging studies, which are aimed at answering this question. We are guided from naturally occurring jetting, for example when an oscillating drop shoots out a jet from its apex. We will also show some ways to generate regular jets which are only a few micrometers in diameter and can emerge at 200 m/s. Numerous high-speed videos will be shown, taken at frame-rates up to 1 million fps.