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Lattice Boltzmann method simulation of the gas heat conduction of nanoporous material

ABSTRACT
In order to deeply investigate the gas heat conduction of nanoporous aerogel, a model of gas heat conduction was established based on microstructure of aerogel. Lattice Boltzmann method (LBM) was used to simulate the temperature distribution and gas thermal conductivity at different size, and the size effects of gas heat conduction have had been obtained under micro-scale conditions. It can be concluded that the temperature jump on the boundary was not obvious and the thermal conductivity remained basically constant when the value of Kn was less than 0.01; as the value of Kn increased from 0.01 to 0.1, there was a clear temperature jump on the boundary and the thermal conductivity tended to decrease and the effect of boundary scattering increased drastically; as the value of Kn was more than 0.1, the temperature jump increased significantly on the boundary. furtherly, the thermal conductivity decreased dramatically, and the size effects were significantly.
KEYWORDS
PAPER SUBMITTED: 2018-09-06
PAPER REVISED: 2019-02-14
PAPER ACCEPTED: 2019-03-15
PUBLISHED ONLINE: 2019-04-07
DOI REFERENCE: https://doi.org/10.2298/TSCI180906102H
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