Abstract
A novel droplet generator equipped with flow-control has been developed for the formation of molten tin droplets. The piston with a piezoelectric crystal enables us to change the flow resistance in a narrow gap region between a liquid vessel and a nozzle, resulting in the variation of the flow velocity at a high repetition rate. The formation of tin droplets using this generator was demonstrated in a wide frequency region from 16 to 59kHz using a 50|im nozzle, which lies with the range of 3.9<λ/d<14. The separation of the piezoelectric crystal and the nozzle in this droplet generator is quite suitable for high-temperature liquids such as molten tin and for harsh environments such as those in vacuum.
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