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THERMAL CONDUCTIVITY AND HEAT TRANSFER IN A SEMICONDUCTOR NANOTUBE

DOI: 10.1615/ICHMT.2008.CHT.510
12 pages

Leila Choobineh
Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran

Afrasiab Raisi
Engineering Faculty, Shahrekord University, Shahrekord, PO Box 115, Iran

Mahmood A. Yaghoubi
School of Mechanical Engineering, Shiraz University, P. O. Box 71348-51154, Shiraz, Iran; Academy of Science, I.R. Iran

Abstract

As the sizes of electronic and mechanical devices are decreased to the micron and nanometer level, it becomes particularly important to predict the thermal transport properties of the components. In this study, steady state heat transfer in a semi conductor nanotube is analysed and the influence of radial thicknesses on heat transfer and thermal conductivity are examined. For heat transfer numerical calculation, the phonons are considered as the major heat carriers. Such process happens when the phonon MFP (mean-free path) is comparable with the thickness of the nanotube. Since the thickness of the tube is considered to be in the same order or even smaller than the typical MFP of the phonons, the BTE (Boltzmann transport equation) is more appropriate for determining temperature distribution and energy flux across the layer. For such calculation the BTE is solved numerically and the results show that there is a jump in the temperature at the boundaries. When the thickness of nanotube is increased the heat flux dropped and the thermal conductivity increased.

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