Aqueous foams with densities from 0.03 to 0.2 g/cm3 were studied for their thermal conductivity. It is important to determine an aqueous foam's thermal response because it is often used as a geothermal drilling fluid. In this paper, both helium and nitrogen foams were used each with a different bubble size range. The data was collected using transient line source probe ...
Temperatures within the ice sheets in Antarctica are extremely important for several reasons. Due to the importance of ice temperature, the thermal conductivities of snow and firn were found with the transient line technique at Filchner Ice Shelf. The quick measurements, high spatial resolution, and small probe diameter (1.6mm) were obvious advantages to using this technique. A correlation was found between the ...
This study aimed to determine the thermal conductivity of gas-filled Metal Organic Framework (MOF) materials. Glass beads were used as the reference material, and nitrogen (N2) and helium (He) were added to the MOF materials. A TPS instrument measured the thermal conductivity of the MOF samples using the Transient Plane Source (TPS) method. Results showed that the MOF materials containing copper had higher thermal conductivities than iron-filled materials, and the ...
In this paper, the thermal conductivity of rock samples was tested using three different methods: the transient plane source (TPS) method, the divided bar method, and calorimetric method. Two rock samples were tested under the TPS method with different procedures (i.e. heating and cooling times, sizes of samples). The results of the TPS method were slightly lower than the results of the divided bar method, but yielded an acceptable ...
Methyl and ethyl alcohol have good thermophysical characteristics for use in refrigeration systems. The purpose of this study was to measure the thermal conductivity of ethyl and methyl alcohol solutions to determine if they can become competitive secondary fluids. A Thermal Constants Analyzer measured the thermal conductivity of various 20-wt% ethyl alcohol and 20 wt-% propyl alcohol solutions using the Transient Plane Source (TPS) method. Measurements were taken after 1, 2, and 3 seconds ...
