Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flow of anisometric particles in a quasi-2D hopper   The stationary flow field in a quasi-two-dimensional hopper is investigated
experimentally. The behavior of materials consisting of beads and elongated
particles with different aspect ratio is compared. We show, that while the
vertical velocity in the flowing region can be fitted with a Gaussian function
for beads, in the case of elongated grains the flowing channel is narrower and
is bordered with sharper velocity gradient. For this case, we quantify
deviations from the Gaussian velocity profile. Relative velocity fluctuations
are considerably larger and slower for elongated grains.

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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
1
The categories of this paper are: cs
18
The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph