Extension and optimization of a three-layer method for the estimation of thermal conductivity of super-insulating materials

Abstract : The three-layer method is a characterization method dedicated to the measurement of the thermal conductivity of small samples made out of insulating or super-insulating materials. It is based on the transient recording of the mean temperatures of two brass plates placed, respectively, above and under the sample, one of them being heated. In case of a super insulating material, the rate of heat flow from the heated to the unheated plate through the surrounding air is not negligible with respect to the rate of heat flow through the sample. It is shown that introduction of a simple parallel thermal resistance allows taking this flow of heat into account. An analytical model, based on a new quadrupolar approach, was developed to estimate this resistance considered further as a known parameter in the estimation process. An experimental study was carried out to characterize samples whose thermal conductivities have been measured previously with another method. The deviation of the estimated thermal conductivities from these reference values with respect to the three-layer method results reaches 29% without considering parallel heat flow but is lower than 2% using the new model.
Type de document :
Article dans une revue
Journal of Applied Physics, American Institute of Physics, 2014, 116 (14), pp.143509. 〈10.1063/1.4897507〉
Liste complète des métadonnées

https://hal.univ-lorraine.fr/hal-01418279
Contributeur : Lemta Ul <>
Soumis le : vendredi 16 décembre 2016 - 15:24:47
Dernière modification le : jeudi 11 janvier 2018 - 06:27:33

Identifiants

Collections

Citation

Seyed Amir Bahrani, Yves Jannot, Alain Degiovanni. Extension and optimization of a three-layer method for the estimation of thermal conductivity of super-insulating materials. Journal of Applied Physics, American Institute of Physics, 2014, 116 (14), pp.143509. 〈10.1063/1.4897507〉. 〈hal-01418279〉

Partager

Métriques

Consultations de la notice

57