Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 15, Issue 4, Pages 3218-3223Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2015.9676
Keywords
Silica Aerogel; Effective Thermal Conductivity; Unit Cell Model; Probability Model
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Funding
- National Natural Science Foundation of China [51276138]
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In this paper, two modified unit cell models, truncated octahedron and cubic array of intersecting square rods with 45-degree rotation, are developed in consideration of the tortuous path of heat conduction in solid skeleton of silica aerogel. The heat conduction is analyzed for each model and the expressions of effective thermal conductivity of the modified unit cell models are derived. Considering the random microstructure of silica aerogel, the probability model is presented. We also discuss the effect of the thermal conductivity of aerogel backbone. The effective thermal conductivities calculated by the proposed probability model are in good agreement with available experimental data when the density of the aerogel is 110 kg/m(3).
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