Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wetting of an annular liquid in a capillary tube   In this paper, we systematically investigate the wetting behavior of a liquid
ring in a cylindrical capillary tube. We obtain analytical solutions of the
axisymmetric Young-Laplace equation for arbitrary contact angles. We find that,
for specific values of the contact angle and the volume of the liquid ring, two
solutions of the Young-Laplace equation exist, but only the one with the lower
value of the total interfacial energy corresponds to a stable configuration.
The transition to an unstable configuration is characterized by specific
critical parameters such as the liquid volume, throat diameter etc. Beyond the
stable regime, the liquid ring transforms into a plug. Based on numerical
simulations, we also discuss the transition of an axisymmetric ring into
non-axisymmetric configurations. Such a transition can be induced by the
Rayleigh-Plateau instability of a slender liquid ring. The results are
presented in terms of a map showing the different liquid morphologies as a
function of the parameters governing the problem.

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: nlin