STUDY OF THE DEPENDENCE OF THERMAL (THERMOPHYSICAL) PROPERTIES OF ROCKS ON TEMPERATURE
Keywords:
thermal conductivity, thermal diffusivity, specific heat capacity, rocks, microwave irradiation, temperatureAbstract
The results of determining the thermal parameters of rocks after exposure to microwave waves at different irradiation times are presented. The heat capacity, thermal diffusivity, specific energy capacity and specific thermal resistance of rocks were determined at different times of exposure to microwave waves. Rocks with different physical and mechanical properties were taken as objects of study: marble and sandstone from the Kumtor deposit. The nature of changes in the thermal properties of rocks observed when the heating temperature increased from 300 to 1460 K was investigated. For this, a series of experiments were carried out using 14 samples of marble and sandstone with a gradual increase in the exposure time to microwave waves from 1 min. up to 12 minutes. The dependence of the thermal characteristics of the studied samples on temperature was determined taking into account the following data, for marble the density is ρ=2700 kg/m3, and for sandstone of the Kumtor deposit: ρ=3000 kg/m3 [2]. Using formulas (2.1.1) and (2.1.2), the thermal conductivity coefficient and thermal resistance of the studied rocks were determined at different times of exposure to microwave waves.
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