Search Results for: carbon nanotubes

Total Search Results Found: 73

Enhanced thermo-electrochemical power using carbon nanotube additives in ionic liquid redox electrolytes

Thermocells are heat waste harvesting devices that operate at room temperature. The addition of multi-walled carbon nanotubes (MWCNTs) to ionic liquids (ILs) in thermocells enhances electrical conductivity, and the device can operate at higher temperatures. In this study, various properties of ionic liquids containing MWCNTs were examined, and a TPS system measured the thermal conductivity of the samples using the transient plane source (TPS) method. Results showed that the thermal conductivity enhancement of the IL-based thermocell was 8 to 10 times lower than the electric power enhancement after the addition of MWCNTs, which improved the efficiency of the thermocell.

Thermal properties of carbon nanotube reinforced metal composites

The application of carbon nanotubes to thermal management devices has recently drawn much attention. This study produced and examined metal-carbon nanotube composites for use in highly conductive yet stable thermal management materials. The structural and thermophysical properties of metal-CNT composites were examined, including the measurement of thermal conductivity using the Thermal Constants Analyzer TPS transient plane source (TPS) method. Results showed that generally, inverse relationships were observed between thermal conductivity and nanotube concentration, as well as between the composite thermal conductivity and CNT content. Additionally, the covalent functionalized CNTs had the highest thermal conductivity of all the Cu-CNT composite samples.

Effects of hybrid nanofluid mixture in plate heat exchangers

In this study, multi-walled carbon nanotubes (MWCNTs) were added to Al2O3/water nanofluids to determine their heat transfer and temperature drop properties compared to water and Al2O3/water nanofluids. A TPS thermal constants analyzer measured the thermal conductivity of the Al2O3/water nanofluids using the transient plane source (TPS) method. The thermal conductivity of Al2O3/water nanofluids was further enhanced with the addition of MWCNTs because they occupy fluid space and form thermally conductive nanoparticle/CNT networks.

Temperature dependent heat transfer performance of multi-walled carbon nanotube-based aqueous nanofluids at very low particle loadings

Thermally conductive nanoparticles are often added to conventional fluids to improve thermal properties. In this paper, the effect of small concentrations of multiwalled carbon nanotubes (MWCNTs) on thermal conductivity over a range of temperatures was tested. A Thermal Constant Analyser measured the thermal conductivity of the nanofluids with the transient plane source (TPS) method from 10 to 80 °C. Results showed that thermal conductivity of the nanofluids increased with temperature, and with nanoparticle concentration. The nanofluids also showed impressive stability over time; a characteristic that could be used for applications in coolant systems.

Thermo-optical properties of partially unzipped multiwalled carbon nanotubes dispersed nanofluids for direct absorption solar thermal energy systems

Water is being used to absorb incident light for use in solar power applications. Adding nanoparticles to water improves the solar collection efficiency. In this paper, a Thermal Analyzer measured the thermal conductivity of the nanofluids using the transient plane source (TPS) method. Results showed that the thermal conductivity of the nanofluids increased with temperature and nanoparticle concentration.