Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Contact line pinning and de-pinning can modulate the rod-climbing effect   Our experiments on the rod-climbing effect with an oil-coated rod revealed
two key differences in the rod-climbing phenomena compared to a bare rod. On
one hand, an enhancement in magnitude of climbing height for any particular
value of rod rotation speed and second, a decrease in threshold rod rotation
speed required for the appearance of the rod-climbing effect were observed.
Observed phenomena is explained by considering the contact line behavior at the
rod-fluid interface. Transient evolution of meniscus at the rod-fluid interface
revealed that the three-phase contact line was pinned for a bare rod and
de-pinned for an oil-coated rod. We modelled the subject fluid as a Giesekus
fluid to predict the climbing height. The differences in the contact line
behaviour were incorporated via the contact angle at the rod-fluid interface as
a boundary condition. An agreement was found between the observed and predicted
climbing height establishing that contact line behaviour may modulate
rod-climbing effect.

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The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas