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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Molecular dynamics simulation of the thermal conductivity of nanotube

Get access (open in a dialog) DOI: 10.1615/IHTC12.4150
6 pages

要約

The radial thermal conductivity of an Ar-type nanotube is investigated using non-equilibrium molecular dynamics with Lennard-Jones potential. The radial thermal conductivity of the nanotube beneath Debye temperature depends on the system average temperature and the diameter or the tube wall thickness. The variations of conductivity with temperature and size are due to the size effects and the phonons umklapp scattering. A novel phenomenon is observed that the thermal conductivity along the radial direction varies with the heat flux direction when the heat flux direction is reversed under the same system average temperature and size. The discussion of mechanisms includes several aspects, such as phonon wavevector, thermal accommodation coefficient, etc. If this dependence of thermal conductivity on heat flux direction can be approved we can design thermal diode that may have wide application in engineering.