Thermal Rectification in the Coaxial Carbon Nanotube@boron Nitride Nanotube Composite

To control and utilize thermal energy more precisely, an asymmetric thermal rectifier is designed in this paper. Through molecular dynamics calculations, it is found that the device has obvious thermal rectification phenomenon. The equivalent thermal conductivity of the device increases gradually with temperature. The thermal rectification coefficients at different temperatures are calculated, and it is found that the thermal rectification coefficients fluctuated wildly with temperature. The temperature distribution map inside the device and the fact that the thermal conductivity of the device increases with temperature indicate that the asymmetry of radial heat transfer and the interlayer coupling determine this thermal rectification property.