The effects of particle size/shape, base fluid, and volumetric concentration on the thermal conductivity of nanofluids has been studied. It was found that decreasing the particle size leads to an increased thermal conductivity, and that using water as a base fluid led to the greatest enhancement of thermal conductivity. The effects of gravity, Brownian motion, and thermophoresis on particle motion were also investigated and it was found that gravity ...
The thermal conductivity, viscosity, and stability of nanofluids were evaluated to determine how varying experimental conditions can affect these properties. It was determined that increasing the concentration, temperature, and time spent sonicating the nanofluids can increase the thermal conductivity, while the addition of alcohol caused a decrease in thermal conductivity. Furthermore, it was found that the shape of the particles has an effect on the measured thermal conductivity. It was ...
Three techniques were compared for the determination of thermal conductivity in poly-alpha-olefin (PAO)-based nanofluids. The three methods that were used were the transient hot wire, transient plane source, and laser flash techniques. The effects of temperature, nanoparticle concentration, and shape on the thermal conductivity were also examined, and these effects were compared to those predicted by a previously determined model. It was found that the transient hot wire technique ...
The authors have dispersed mesoporous silica (MPSiO2) nanoparticles in water and determined the thermal conductivity for each of the resulting nanofluids. It was determined that the thermal conductivity of the nanofluid was greater than that of water, so these nanofluids have potential for use in heat exchanger applications....
The authors have developed a model for the estimation of how a nanofluid will work as a coolant without having to perform a number of experiments. The nanofluids used in the study were four water based metallic oxides. These nanofluids were compared to water in terms of thermal conductivity to determine if they would be a good coolant. The model that was developed involved the calculation of the highest wall ...