Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flow and Thermal Fields Investigation in Divergent Micro/Nano Channels   The present work is related to the study of the nitrogen gas flow through
diverging micro and nano-channels. The direct simulation Monte-Carlo (DSMC)
method has been used to study the flow. The Simplified Bernoulli Trials (SBT)
collision scheme has been employed to reduce the computational costs and
required amounts of the computer resources. The effects of various divergence
angles on flow and thermal fields have been studied for different Knudsen
numbers in late-slip and early-transition regimes. The inlet-to-outlet pressure
ratio has been set to 2.5 for micro and nano-channels with a uniform constant
wall temperature. By analyzing the numerical results no flow separation has
been found due to slip at the wall which is different than flow behavior in
continuum regime. The results indicate that the viscous component has a
relatively large contribution to the overall pressure drop and flow behavior.
It observed that for low divergence angles the effects of pressure forces
dominate the effects of shear stress and divergence angle and cause the flow to
accelerate along the channel while by increasing the divergence angle and
therefore the effects of flow expansion, the flow decelerates along the
channel. The mass flow rate through channel increases by increasing the
divergence angle. Cold-to-hot heat transfer has been observed in diverging
micro and nano-channels. In order to investigate the thermal behavior in
diverging micro and nano-channels, the results have been compared to weakly
non-linear constitutive laws derived from Boltzmann's equation.

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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat