Foam Glass Aggregates: Thermal Properties According to Aggregate's General Characteristics

摘要

Different heat transfer mechanisms are possible depending on the particle size and on the saturation degree of the foam glass aggregates. Foam glass aggregates of particle size between 20 and 60 mm were tested with downward and upward heat flows. While the main transfer mechanisms during downward heat flow were conduction and radiation, convection cells were noted when the bottom plate was heated and the upper plate cooled. A linear and uniform temperature distribution was noted in the cell when the heat flow was downwards (conduction and radiation heat transfer mechanisms). The equivalent thermal conductivity of the tested sample is 0.18 W/℃.m. When upward heat flow was induced, the heat flow increased with the difference of temperature between the top and bottom plates. However, unlike downward heat flow, the temperature distribution was not linear and uniform in the cell. The convection cells created a non-uniform heat flow distribution and consequently a non-uniform temperature distribution. The intrinsic permeability of the tested sample is 0.345×10~(-6) m~2.