Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Air Entrainment by Viscous Contact Lines   The entrainment of air by advancing contact lines is studied by plunging a
solid plate into a very viscous liquid. Above a threshold velocity, we observe
the formation of an extended air film, typically 10 microns thick, which
subsequently decays into air bubbles. Exploring a large range of viscous
liquids, we find an unexpectedly weak dependence of entrainment speed on liquid
viscosity, pointing towards a crucial role of the flow inside the air film.
This induces a striking asymmetry between wetting and dewetting: while the
breakup of the air film strongly resembles the dewetting of a liquid film, the
wetting speeds are larger by orders of magnitude.

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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th