Volume 19, Issue 9 (September 2019)                   Modares Mechanical Engineering 2019, 19(9): 2105-2110 | Back to browse issues page

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Ghaderi H, Ghasemi A, Rouhi S, Mahdavi E. Evaluation of the Heat Transfer Coefficient of Multi-walled Boron Nitride Nanotubes. Modares Mechanical Engineering 2019; 19 (9) :2105-2110
URL: http://mme.modares.ac.ir/article-15-21278-en.html
1- Mechanical Engineering Department, Engineering Faculty, Langroud Branch, Islamic Azad University, Guilan, Iran
2- Mechanical Engineering Department, Engineering Faculty, North Tehran Branch, Islamic Azad University, Tehran, Iran , a.ghasemi@iau-tnb.ac.ir
3- Mechanical Engineering Department, Mechanical Engineering Faculty, Iran University of Science & Technology, Tehran, Iran
Abstract:   (7150 Views)
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.
Full-Text [PDF 1122 kb]   (2675 Downloads)    
Article Type: Original Research | Subject: Heat & Mass Transfer
Received: 2018/06/5 | Accepted: 2019/01/29 | Published: 2019/09/1

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