Gravity-free hydraulic jumps and metal femtocups

Details Gravity-free hydraulic jumps and metal femtocups Gravity-free hydraulic jumps and metal femtocups

2006-10-03

arxiv.org/abs/physics/0610021v1

Physics

Fluid Dynamics

4 pages, 8 figures; submitted to Phys. Rev. Lett.

Scientific paper

Hydraulic jumps created by gravity are seen every day in the kitchen sink. We show that at small scales a circular hydraulic jump can be created in the absence of gravity, by surface tension. The theory is motivated by our experimental finding of a height discontinuity in spreading submicron molten metal droplets created by pulsed-laser ablation. By careful control of initial conditions, we show that this leads to solid femtolitre cups of gold, silver, copper, niobium and tin.

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