RT info:eu-repo/semantics/article
T1 Contribution of the radiative transfer mechanism to the total thermal conductivity of anisotropic porous materials
A1 Torre Ordás, Jorge
A1 Bernardo García, Victoria
A1 Pinto Sanz, Javier
A1 Rodríguez Pérez, Miguel Ángel
K1 Thermal insulation
K1 Extrusion
K1 Polymers
K1 Anisotropy
K1 Infrared radiation
AB In order to understand the performance of polymeric porous materials as heat insulators, the contribution of theradiative transfer mechanism in porous materials with high ratios of anisotropy is studied. Porous materialsbased on extruded polystyrene (XPS) with relative density in the range of 0.03 − 0.05 and with a range ofanisotropy ratios of 0.6 − 1.4 have been selected for this research. The study begins with a characterization of theselected materials in terms of porous structure and thermal conductivity as a function of temperature. Then, theradiative contribution for each of the three main directions of the materials is obtained by three independentmethodologies: Fourier Transform Infrared (FTIR) spectroscopy, derivation from the total conductivity usingtheoretical models, and theoretical calculation from the model proposed by Glicksman. The results show similartrends for all methods and confirm clear differences between each direction, showing a significant reduction ofthe radiative contribution and, thus, the total conductivity, if the material is oriented geometrically towards thedirection in which the pore size is the smallest. Indeed, reductions of 17 − 20% in the total conductivity can be achieved at temperatures ranging from 10 − 40 ◦C if the material is reoriented as stated.
PB Elsevier
SN 0142-9418
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/73120
UL https://uvadoc.uva.es/handle/10324/73120
LA eng
NO Polymer Testing, julio 2024, vol. 136, 108487
NO Producción Científica
DS UVaDOC
RD 22-ene-2025