Numerical simulation of thermal conduction and diffusion through nanoporous superinsulating materials

Abstract : Nanoporous superinsulating materials have an extraordinary power of thermal insulation. The thermal conductivities of these heterogeneous materials can achieve a few when they are placed under primary vacuum at ambient temperature. In this contribution, we focus on the numerical simulation of the conduction heat flux traveling through a nanoporous material in relation with its nanostructure. We have developed two models in order to study either steady-state conduction heat transfer or transient conduction heat transfer through a fractal representation of a nanoporous material, in order to determine either the effective thermal conductivity or the effective thermal diffusivity of the material. Then, we have applied these models to a study concerning the influence of the nanoparticle volume fraction on the effective thermal conductivity and the effective thermal diffusivity of a nanoporous material.
Complete list of metadatas

Cited literature [8 references]  Display  Hide  Download

https://hal-centralesupelec.archives-ouvertes.fr/hal-01287483
Contributor : Franck Enguehard <>
Submitted on : Sunday, March 13, 2016 - 2:57:57 PM
Last modification on : Monday, October 15, 2018 - 4:00:03 PM
Long-term archiving on : Tuesday, June 14, 2016 - 10:20:31 AM

File

Article Rochais et al ECTP'17 ...
Files produced by the author(s)

Identifiers

  • HAL Id : hal-01287483, version 1

Collections

Citation

Denis Rochais, Gilberto Domingues, Franck Enguehard. Numerical simulation of thermal conduction and diffusion through nanoporous superinsulating materials . 17th European Conference on Thermophysical Properties, Sep 2005, Bratislava, Slovakia. ⟨hal-01287483⟩

Share

Metrics

Record views

60

Files downloads

50