Effect of radial heat conduction on effective thermal conductivity of carbon nanotube bundles
| Autor: | Re Xia, Jianli Wang, Hang Yin, Yuhan Hu, YaMei Song, Yunfei Chen, Yunfeng Gu, YuFeng Zhang |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Hexagonal crystal system General Engineering 02 engineering and technology Carbon nanotube 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences law.invention Condensed Matter::Materials Science Radial heat flow Thermal conductivity law Vacancy defect Bundle 0103 physical sciences Thermal Physics::Atomic and Molecular Clusters General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Science China Technological Sciences. 61:1959-1966 |
| ISSN: | 1869-1900 1674-7321 |
| DOI: | 10.1007/s11431-018-9306-8 |
| Popis: | The effect of the radial heat conduction on the effective thermal conductivity of carbon nanotube (CNT) bundles is studied by the nonequilibrium molecular dynamics (NEMD) method. The hexagonal CNT bundle consists of seven (10, 10) single-walled carbon nanotubes (SWCNTs). The radial heat conduction is induced by creating the vacancy defects in some segments of the constituent CNTs. Combined with the temperature differences and the inter-tube thermal resistances at the different segments, the radial heat flow in the CNT bundle is calculated. The maximum percentage of the radial heat flow is less than 7% with the presence of four defective CNTs, while the resultant decrement of the effective thermal conductivity of the bundle is about 18%. The present results indicate that the radial heat flow can significantly diminish the axial heat conduction in the CNT bundles, which probably explains the smaller effective thermal conductivity in the CNT assemblies compared to that of the individual CNTs. |
| Databáze: | OpenAIRE |
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