To grate a liquid into tiny droplets by its impact on a hydrophobic micro-grid

Details To grate a liquid into tiny droplets by its impact on a hydrophobic micro-grid To grate a liquid into tiny droplets by its impact on a hydrophobic micro-grid

2009-11-30

arxiv.org/abs/0912.0035v1

Physics

Fluid Dynamics

3 pages, 5 figures, Accepted for publication in Applied Physics Letters

Scientific paper

We report on experiments of drop impacting a hydrophobic micro-grid, of typical spacing a few tens of $\mu$m. Above a threshold in impact speed, liquid emerges to the other side, forming micro-droplets of size about that of the grid holes. We propose a method to produce either a mono-disperse spray or a single tiny droplet of volume as small as a few picoliters corresponding to a volume division of the liquid drop by a factor of up to 10$^5$. We also discuss the discrepancy of the measured thresholds with that predicted by a balance between inertia and capillarity.

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