In this paper, thermal properties of CdS and ZnS nanoparticles are examined to understand heat transfer behavior through polystyrene (PS) composites. The transient plane source (TPS) method was used to measure the thermal conductivities of the CdS/PS and ZnS/PS nanocomposites. Results showed that the nanocomposites followed a similar increasing trend until a common temperature where each sample adopted a constant thermal conductivity. Overall, the ZnS/PS nanocomposites showed ...
In this study, pure eicosane and eicosane-CuO solid composites were prepared using ambient and ice-water bath solidification methods. A Thermal Constants Analyzer measured the thermal conductivity of the samples using the transient plane source (TPS) technique. Results showed that for both solidification methods, composite thermal conductivity was independent of temperature up to a point, and the composites with the highest nanoparticle concentrations had the highest thermal conductivity. Although the composites ...
Nano-inclusions are thermally conductive particles that improve the thermal conductivity of liquid mediums. In this paper, the thermal properties of Mg2Si were evaluated after the addition of TiO2 nanoparticles. An instrument measured the thermal conductivity of the nanofluid using the transient plane source (TPS) method. Results showed that the thermal conductivity of the nanofluid was the highest at lower temperatures, and did not improve with the addition of the ...
This article looks at the thermal properties of titanium oxide (TiO2) based nanofluids and their applications as thermal vectors. The nanoparticle size was studied by dynamic light scattering (DLS) and the stability was measured by Zeta potential. The concentrations of TiO2 used ranged from 1 to 35% by mass in the water-based nanofluid. Thermal conductivity was measured and the effects of concentration of TiO2 and temperature on the thermal conductivity were studied. ...
This study looks at the effects of pH on heat transfer, among other things, of nanofluids. Over 20% enhancement of thermal conductivity was noted with nanofluids containing 3wt% zirconium dioxide and titanium dioxide. Also noted, was the influence of pH on the stability of the nanofluids. The Derjaguin-Landau-Verwey-Overbeek theory states that nanoparticles become unstable, form clusters and precipitate, when their pH is near the isoelectric point. This leads to large clusters ...