Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: To grate a liquid into tiny droplets by its impact on a hydrophobic
  micro-grid   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.

26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat