Thermal conductivity of copper and silica nanoparticle packed beds
| Autor: | Muftah Elsahati, Kevin Clarke, Robert F. Richards |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Packed bed Materials science General Chemical Engineering Nanoparticle chemistry.chemical_element 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal conduction 01 natural sciences Copper Atomic and Molecular Physics and Optics Thermal conductivity chemistry 0103 physical sciences Thermal Composite material 0210 nano-technology Ambient pressure |
| Zdroj: | International Communications in Heat and Mass Transfer. 71:96-100 |
| ISSN: | 0735-1933 |
| DOI: | 10.1016/j.icheatmasstransfer.2015.12.034 |
| Popis: | We report here thermal conductivity measurements of packed beds of nanoparticles both under vacuum and at ambient pressure and compare those measurements to theoretical predictions. The thermal conductivity measurements of the nanoparticle beds under vacuum were found to be as low as 0.018 W/m °C, among the lowest thermal conductivities of solid materials ever measured. Theoretical predictions agreed with the conductivity measurements under vacuum within experimental uncertainty. In contrast, thermal conductivities measured for nanoparticle beds at ambient pressure were an order of magnitude higher than the measurements under vacuum, and significantly higher than the theory predicted. These results indicate a serious limitation that could impact the use of nanoparticle beds as very low conductivity insulating materials. |
| Databáze: | OpenAIRE |
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