Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Droplet Impact Dynamics on Micropillared Hydrophobic Surfaces   The effect of pitch of the pillars and impact velocity are studied for the
impact dynamics of a microliter water droplet on a micropillared hydrophobic
surface. The results are presented qualitatively by the high-speed photography
and quantitatively by the temporal variation of wetted diameter and droplet
height. A characterization of the transient quantitative results is a novel
aspect of our work. Three distinct regimes, namely, non-bouncing, complete
bouncing and partial bouncing are presented. A critical pitch as well as impact
velocity exists for the transition from one regime to another. This is
explained with a demonstration of Cassie to Wenzel wetting transition in which
the liquid penetrates in the grooves between the pillars at larger pitch or
impact velocity. The regimes are demarcated on a map of pitch and impact
velocity. A good agreement is reported between the present measurements and
published analytical models.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas