The thermal properties of five sandstones were measured. The sandstones were taken from the base of Khewra located in Pakistan. The thermal conductivity, thermal diffusivity, and specific heat capacity were determined using the transient plane source technique, and the porosity and density of the sandstone samples were also determined. A formula for the estimation of thermal conductivity was modified to better fit the experimental data, and it was determined that ...
The mathematical model for a transient plane source (TPS) is based on a number of concentric ring sources with an infinitely small gap between sample and sensor (strips model). The purpose of this article is to create a model that accounts for the size of the sensor, three models were tested the disk, circles, and rings. The circles model gave almost exactly the same values for thermal conductivity as the ...
High intensity focused ultrasound (HIFU) is a new noninvasive method for treating certain tumors. Tissue mimicking phantoms are used to test HIFUs because it provides real time visualization of HIFU induced lesion evolution, and can calibrate the HIFU transducers. This study investigates the thermophsyical properties of egg white phantoms at room temperature, and varying concentrations of egg white. Measurements of thermal conductivity, diffusivity, and specific heat were taken using a ...
The purpose of this study is to demonstrate the ability of a transient plane source (TPS) method to measure thermal conductivity, thermal diffusivity, and volumetric heat capacity. Four samples were tested standard steel, linear low-density polyethylene (LLDPE), LLDPE with 5 wt% graphite composite, and LLDPE with 15 wt% graphite composite. Steel had the highest thermal conductivity because steel has more free electrons then the other materials. LLDPE had a lower thermal conductivity ...
The purpose of this study was to measure the thermal properties of ammonia borane and polyiminoborane with the transient plane source (TPS) method to analyze their applicability to heat storage systems. Tests results showed that the thermal diffusivity and thermal conductivity of ammonia borane increased as porosity of the samples decreased. Alternatively, both thermal properties of polyiminoborane increased with porosity, and thermal conductivity values were significantly lower than those obtained ...
