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One way to increase the thermal conductivity of a conventional fluid is to add solid particles to the liquid. Aluminum nitride (AlN) is an effective thermal conductor so it is popularly used to fabricate nanofluids. In this study, 20 nanometer particles of AlN were distributed into ethanol and the thermal conductivity of the solution was measured using a thermal constant analyzer from 0.5 volume fraction (vol%) to 4.0 vol% at 273.15 kelvin (K) and 297.15 ...
Nanoparticle-enhanced phase change materials (NePCMs) are nanofluids that can be used for thermal energy storage when they undergo solid-liquid phase transitions. In this study, a Thermal Constants Analyzer (TPS) measured the thermal conductivity of eicosane-based NePCM samples using the transient plane source (TPS) method. Results showed that thermal conductivity of the solid composites increased with temperature, and eicosane-CuO samples that solidified in an ice-water bath had the lowest thermal conductivities, ...
In an effort to enhance heat transfer in the laminar flow regime of a heating duct, TiO2 and SiO2 nanoparticles were added to water to create nanofluids with a higher thermal conductivity than that of the water alone. Twist-tape was also used to enhance heat transfer within the duct. The thermal conductivities of the nanofluids were measured using the Transient Plane Source instrument. It was found that the use of ...
Two series of nanofluids were prepared by the researchers, using water as the carrier fluid, and Al2O3 and TiO2 as the nanoparticles; up to 6% particle volume fraction was used. The thermal conductivity and thermal diffusivity of the nanofluids were measured using the transient plane source (TPS) technique, and dynamic viscosity was also measured. The amount of nanoparticle volume fraction affected the value of thermal conductivity, but the nanoparticle cluster ...
Al2O3 nanofluids were prepared with 2, 3, and 4 vol% Al2O3 nanoparticles in water for use as a coolant in plate heat exchangers. Using the transient plane source (TPS) technique, the thermophysical properties of the nanofluids were studied. Correlation equations were obtained for Nusselt number and the friction factor for the nanofluids and water. Less nanofluid is required to produce the same amount of cooling than water....
