Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Granular-like behavior of molecular flow in constricted nanopores   The fluid flow through porous media is described by Darcy's law, while the
fluid/wall interactions can be neglected. In nanopores, where adsorption
dominates, Darcy's extension has been made, but approaches able to describe
flows in mesopores are still lacking. We show here that molecular flows through
nano-constrictions is well described by Berverloo's law, predicting the mass
flow rate of granular material through macro-apertures. This molecular and
granular analogy, allows to derive a relationship providing a theoretical
framework for the molecular flow in disordered mesoporous systems.

2
The categories of this paper are: math
14
The categories of this paper are: math-ph
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
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph