Thermal conductivity of dielectric nanowires with different cross-section shapes
Gu Xiao-Kun(顾骁坤) and Cao Bing-Yang(曹炳阳)†
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China
Abstract Non-equilibrium molecular dynamics simulations have been performed to investigate the effect of the cross-section shape on the thermal conductivity of argon nanowires. Some typical cross-section shapes, such as triangle, square, pentagon, hexagon and circle, are carefully explored. The simulation results show that with the same cross-sectional area of the regular polygons, the thermal conductivities decrease with the reduction of the sides of the polygons, and the thermal conductivity of the circular nanowire is larger than those of the other polygonal ones. Phonon gas kinetic theory is used to analyse the phonon transport in nanowires, and the concept of equivalent diameter is proposed to illustrate the characteristic dimension of the none-circular cross-section.
(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
Fund: Project supported by the National Natural
Foundation of China (Grant No~50606018) and by SRT Foundation of Tsinghua
University (Grant No~061T0249).
Cite this article:
Gu Xiao-Kun(顾骁坤) and Cao Bing-Yang(曹炳阳) Thermal conductivity of dielectric nanowires with different cross-section shapes 2007 Chinese Physics 16 3777
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