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8. Numerical Simulation of Thermal Conductivity of Foam Glass Based on the Steady-State Method

Author

Tian Yan, Zipeng Qin, Gang Li, Ma Yuwei, and Shen Pengfei

Subjects
Materials science, Chemical substance, Aperture, Thermal resistance, 02 engineering and technology, 01 natural sciences, lcsh:Technology, Article, Thermal conductivity, Thermal insulation, steady state method, 0103 physical sciences, General Materials Science, thermal conductivity, Composite material, Porosity, lcsh:Microscopy, lcsh:QC120-168.85, 010302 applied physics, Foam glass, porous structure, Steady state, lcsh:QH201-278.5, business.industry, lcsh:T, Astrophysics::Instrumentation and Methods for Astrophysics, foam glass, 021001 nanoscience & nanotechnology, Condensed Matter::Soft Condensed Matter, lcsh:TA1-2040, numerical simulation, lcsh:Descriptive and experimental mechanics, lcsh:Electrical engineering. Electronics. Nuclear engineering, 0210 nano-technology, business, lcsh:Engineering (General). Civil engineering (General), lcsh:TK1-9971
Abstract

The effects of fly ash, sodium carbonate content, foaming temperature and foaming time on foam glass aperture sizes and their distribution were analyzed by the orthogonal experimental design. Results from the steady-state method showed a normal distribution of the number of apertures with change in average aperture, which ranges from 0.1 to 2.0 mm for more than 93% of apertures. For a given porosity, the thermal conductivity decreases with the increase of the aperture size. The apertures in the sample have obvious effects in blocking the heat flow transmission: heat flow is quickly diverted to both sides when encountered with the aperture. When the thickness of the sample is constant, the thermal resistance of the foam glass sample increases with increasing porosity, leading to better thermal insulation. Furthermore, our results suggest that the more evenly distributed and orderly arranged the apertures are in the foam glass material, the larger the thermal resistance of the material and hence, the better the thermal insulation.

Published
2018

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