Surfactants are often used in nanofluids to help improve dispersion and prevent aggregation of the resident nanoparticles. In this study, the researchers used the transient plane source (TPS) technique to measure the thermal conductivity of a variety of nanofluids with different surfactants of varying concentrations, at different temperatures and pH values. For surfactants, thermal conductivity stabilizes after the addition of a certain concentration of that surfactant. Strongly acidic and alkaline ...
A variety of metallic hollow sphere structures were prepared with different metals, values for diameter and shell thickness and their densities were predicted using analytical/empirical models. From these densities, admitted scaling laws are used to predict thermal conductivity. The predicted values for thermal conductivity are then compared to experimental values for the same structures, as determined by the transient plane source (TPS) technique....
In this study, three series of high-volume fly ash (HVFA) mortars and concretes were studied using the transient plane source (TPS) technique. Each series of sample contained varying weight % of fly ash from 0 to 75%. The three sample sets were prepared by different laboratories and the results were compared. Thermal conductivity and specific heat capacity were measured, and the authors detailed their method of doing this. It was determined that the ...
Thermal conductivity and thermal diffusivity were simultaneously measured using the transient plane source (TPS) technique. These values were measured during heating from 303 to 323 K and cooling from 323 to 303 K. It was determined that both thermal conductivity and diffusivity were at their maximum at 313 K, which is in the range of the glass transition temperature....
Thermal barrier coatings (TBC) are plasma sprayed onto gas turbine parts in order to improve combustion efficiency and component life time. Two TBC are looked at in this report: yttria partially stabilized zirconia (YPSZ) and dysprosia partially stabilized zirconia (DyPSZ). Both the TPS and laser flash techniques were used to measure the thermal conductivity of the coatings and the results were compared. In addition the effect of barrier microstructure on ...
