VIGNOLES, Gerard L.; ROCHAIS, Denis; CHUPIN, Sylvain

doi:10.1016/j.ijthermalsci.2020.106598

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

VIGNOLES, Gerard L.
Laboratoire des Composites Thermostructuraux [LCTS]

ROCHAIS, Denis
CEA Le Ripault [CEA Le Ripault]

CHUPIN, Sylvain
CEA Le Ripault [CEA Le Ripault]
Laboratoire d'Energétique et Mécanique Théorique et Appliquée [LEMTA ]

Langue

Article de revue

Ce document a été publié dans

International Journal of Thermal Sciences. 2021-01-01, vol. 159, p. 106598

Résumé en anglais

Triply Periodic Minimal Surfaces are attractive porous media for the design of volumetric solar energy receivers; their design involves the evaluation of their heat transfer capabilities in the mixed conductive/radiative mode. We present image-based computations of effective thermal conductivities (ETC) for different radiation/conduction ratios in twenty distinct TPMS structures, using a Hybrid Random Walk numerical method, considering Opaque/Transparent media. Results are cast in simple analytical correlations : the ETC is the sum of a purely conductive contribution proportional to the relative density and of a radiative contribution proportional to the radiation/conduction ratio; the coefficient of proportionality contains an emissivity-independent contribution and another contribution proportional to the emissivity which fades out above a critical ratio. This critical ratio is linearly proportional to the solid/void volume ratio of the media. These results are compared to similar ones obtained on open-cell foams. Application of these dimensionless laws to two realistic cases are presented as illustrative examples.< Réduire

Mots clés en anglais

TPMS

Coupled heat transfer

Radiation

Effective conductivity

Image-based modelling

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Computation of the conducto-radiative effective heat conductivity of porous media defined by Triply Periodic Minimal Surfaces

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

URI

DOI

Unités de recherche