RT - Journal Article T1 - Evaluation of the Heat Transfer Coefficient of Multi-walled Boron Nitride Nanotubes JF - mdrsjrns YR - 2019 JO - mdrsjrns VO - 19 IS - 9 UR - http://mme.modares.ac.ir/article-15-21278-en.html SP - 2105 EP - 2110 K1 - Thermal conductivity coefficient K1 - Multi-walled boron nitride nanotubes (DWBNNT) K1 - Molecular Dynamics (MD) AB - In this paper, the thermal conductivity coefficient of multi-walled boron nitride nanotubes has been investigated, using molecular dynamics simulation based on the Tersoff and Lenard Jones potential functions. The effects of diameter, length, and temperature on the thermal conductivity of double-walled boron nitride nanotubes have been studied. Also, by considering the 2, 3, 4, and 5-wall nanotubes, the effect of number of walls on the thermal conductivity of boron nitride nanotubes were studied. Finally, by considering of zigzag and armchair nanotubes, the effect of chirality has been investigated. The results showed that the thermal conductivity coefficient of double-walled boron nitride nanotubes increases by increasing the diameter of nanotubes and decreases by increasing temperature. It had been demonstrated that with 73% and 82% increase in the outer diameter of nanotubes, the thermal conductivity increases 93% and 98%, respectively. Furthermore, regarding to the chirality, the armchair nanotubes have a higher thermal conductivity than the zigzag ones. Also, the simulation results showed that thermal conductivity coefficient increases by increasing the length of boron nitride nanotubes and 50% increase of effective nanotube length increases the thermal conductivity by 25% approximately. Finally, by studying the effect of the number of walls, it is concluded that in the same length and temperature, nanotubes with higher number of walls have higher thermal conductivity coefficient in comparison. LA eng UL http://mme.modares.ac.ir/article-15-21278-en.html M3 ER -