The objective of this study was to evaluate the transient plane source method for thermal conductivity and diffusivity of food and agricultural materials. An instrument was used to measure thermal conductivity of liquid and solid samples. Thermal conductivity and diffusivity values determined by the TPS method were in close agreement with reported literature values....
This study was conducted to determine if highly expanded open cell polycarbonate foams (PC) could be used as thermal insulation among other characteristics of the foam. This was accomplished through testing the PC foam with the Transient Plane Source (TPS) method. Multiple relative densities of foam were tested, and it was found that the higher the relative density the higher the thermal conductivity, and vice versa. The lower the relative ...
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 ...
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 ...
Aerogels are nano-porous materials with impressive thermal insulation properties. This study uses a new theoretical model to predict the effective thermal conductivity of aerogels based on gas and solid conduction, as well as thermal radiation. A thermal constant analyzer measured the influence of gas pressure, atmosphere, and temperature on the thermal conductivity of nano-porous materials using the transient plane source (TPS) method. Results showed that the experimental thermal conductivity values ...
