Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-ideal gas dynamics under confinement: rarefaction effect, dense
  effect and molecular interaction   The effects of volume exclusion and long-range intermolecular attraction are
investigated by the simplified kinetic model for surface-confined inhomogeneous
fluids. Gas dynamics of the ideal gas, the hard-sphere fluid and the real gas
are simulated by the Boltzmann equation, the Enskog equation and the simple
kinetic equation, respectively. Only the Knudsen minimum appears for the ideal
gas, while both the Knudsen minimum and the Knudsen maximum occur for the
hard-sphere fluid and the real gas under certain confinements, beyond which the
maximum and minimum may disappear. The Boltzmann equation and the Enskog
equation overestimates and underestimates the mass flow rate of the real gas
dynamics under confinement, respectively, where the volume exclusion and the
long-range intermolecular attractive potential among molecules are not
ignorable. With the increase of the channel width, gas dynamics of the
hard-sphere fluid and the real gas tends to the Boltzmann prediction gradually.
The density inhomogeneity, which hinders the flow under confinement, is more
obvious when the solid fraction is larger. The anomalous slip occurs for real
gas under constant confinement. The flow at a smaller Knudsen number (larger
solid fraction or channel width) contributes more practical amount of mass
transfer, although the rarefaction effects is more prominent at larger Knudsen
numbers. The temperature has no effect on density and velocity profiles of the
ideal gas and the hard-sphere fluid, but the energy parameter among the real
gas molecules decreases with the increasing temperature and the real gas
dynamics tends to the hard-sphere ones consequently.

33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat