Journal
INTERNATIONAL JOURNAL OF THERMOPHYSICS
Volume 36, Issue 10-11, Pages 2523-2534Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10765-014-1651-z
Keywords
Effective thermal conductivity; Optimal density; PMI foam; Thermal transport
Funding
- National Natural Science Foundation of China [51306183, 51336009]
- National Basic Research Program of China [2012CB933200]
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Thermal transport in high-strength polymethacrylimide (PMI) foam insulations is described, with special emphasis on the density and temperature effects on the thermal transport performance. Measurements of the effective thermal conductivity are performed by a freestanding sensor-based method. A linear relationship between the density and the effective thermal conductivity is observed. Based on the analysis of the foam insulation morphological structures and the corresponding geometrical cell model, the quantitative contribution of the solid conductivity and the gas conductivity as well as the radiative conductivity to the total effective thermal conductivity as a function of the density and temperature is calculated. The agreement between the curves of the results from the developed model and experimental data indicate the model can be used for PMI foam insulating performance optimization.
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