Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Joule-Thomson inversion curves of mixtures by molecular simulation in
  comparison to advanced equations of state: natural gas as an example   Molecular modelling and simulation as well as four equations of state (EOS)
are applied to natural gas mixtures regarding Joule-Thomson (JT) inversion. JT
inversion curves are determined by molecular simulation for six different
natural gas mixtures consisting of methane, nitrogen, carbon dioxide and
ethane. These components are also regarded as pure fluids, leading to a total
of ten studied systems. The results are compared to four advanced mixture EOS:
DDMIX, SUPERTRAPP, BACKONE and the recent GERG-2004 Wide-Range Reference EOS.
It is found that molecular simulation is competitive with state-of-the-art EOS
in predicting JT inversion curves. The molecular based approaches (simulation
and BACKONE) are superior to DDMIX and SUERTRAPP.

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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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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: stat
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The categories of this paper are: chao-dyn