Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal Conductivity Modeling of Monodispersed Microspheres using
  Discrete Element Method   Particle beds are widely used in various systems and processes, such as
particle heat exchangers, granular flow reactors, and additive manufacturing.
Accurate modeling of thermal conductivity of particle beds and understanding of
their heat transfer mechanisms are important. However, previous models were
based on a simple cubic packing of particles which could not accurately
represent the actual heat transfer processes under certain conditions. Here, we
examine the effect of the packing structure on thermal conductivity of particle
beds. We use monodispersed silica microspheres with average article sizes
ranging from 23 to 330 um as a model material. We employ a transient hot-wire
technique to measure the thermal conductivity of the particle beds with packing
density of 43 to 57% within a temperature range of room temperature to 500 deg.
C and under N2 gaseous pressures of 20 to 760 Torr. We then use a discrete
element method (DEM) to obtain the realistic packing structure of the
particles, which is then fed into a finite-element model (FEM) to calculate the
thermal conductivity, with the consideration of solid conduction, gas
conduction, and radiation heat transfer. Our results show that the thermal
conductivity model based on the more realistic random packing structure derived
from the DEM shows better agreement with the experimental data compared to that
based on the simple cubic packing structure. The combined DEM and FEM
methodology can serve as a useful tool to predict effective thermal
conductivity of particle beds and to quantify different heat transfer
mechanisms under various conditions.

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The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
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The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess