Measurement of Thermal Conductivity of Sandstone Using Lee's Apparatus: A Case Study

The thermal conductivity of rock surrounding the airway is one of the most important thermal properties for estimating strata heat transfer into the mine air and for designing the air-cooling strategies. Several laboratory methods are available for the determination of thermal conductivity; however, most of them are complex and cumbersome. The present study explains the working principle of Lee's apparatus which is relatively simple, easy to fabricate and use, and provides consistent results. In the present study, thermal conductivities of sandstone cores obtained from an Indian coal mine are determined using Lee's apparatus. An approach is discussed for determining the temperature gradient of sandstone specimens while cooling and used for calculating thermal conductivity. The thermal conductivity of different sandstone specimens attains values between 2.37 and 2.59 W m(-1) degrees C-1. For different sandstone cores obtained from the field, properties including specific gravity, specific heat capacity, thermal diffusivity, and porosity, along with thermal conductivity, are determined and highlighted in this study.

Automated summary

This study used Lee's apparatus to determine the thermal conductivity of sandstone cores from an Indian coal mine and discussed the method for determining the temperature gradient and calculating thermal conductivity. Properties including specific gravity, specific heat capacity, thermal diffusivity, and porosity of different sandstone cores obtained from the field were also determined and highlighted in this study.