Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rodless Weissenberg effect   The climbing effect of a viscoelastic fluid when stirred by a spinning rod is
well documented and known as Weissenberg effect(Wei et al, 2006). This
phenomenon is related to the elasticity of the fluid. We have observed that
this effect can appear when the fluid is stirred without a rod. In this work, a
comparison of the flow around a spinning disk for a Newtonian and a
non-Newtonian liquids is presented. The flow is visualized with ink and small
bubbles as fluid path tracers. For a Newtonian fluid, at the center of the
spinning disk, the fluid velocity is directed towards the disk (sink flow); on
the other hand, for a viscoelatic liquid, a source flow is observed since the
fluid emerges from the disk. The toroidal vortices that appear on top of the
disk rotate in opposite directions for the Newtonian and non-Newtonian cases.
Similar observations have been reported for the classical rod climbing flow
(Siginer, 1984 and Escudier, 1984). Some authors have suggested that this flow
configuration can be used to determine the elastic properties of the liquid
(Escuider, 1984 and Joshep, 1973).

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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
9
The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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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: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: astro-ph