中国物理B ›› 2015, Vol. 24 ›› Issue (12): 126302-126302.doi: 10.1088/1674-1056/24/12/126302

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Material properties dependent on the thermal transport in a cylindrical nanowire

张勇a, 谢忠祥a, 邓元祥a, 喻霞a, 李科敏b   

  1. a Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, China;
    b Department of Physics and Electronics Information, Hunan Institute of Science and Technology, Yueyang 414004, China
  • 收稿日期:2015-04-23 修回日期:2015-08-04 出版日期:2015-12-05 发布日期:2015-12-05
  • 通讯作者: Xie Zhong-Xiang, Yu Xia E-mail:xiezxhu@163.com;yuxia83@126.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11404110), the Natural Science Foundation of Hunan Province, China (Grant Nos. 14JJ3139, 2015JJ6027, and 2015JJ6030), the Outstanding Young Program from the Education Department of Hunan Province, China (Grant No. 14B046), and the Doctoral Activation Foundation of Hunan Institute of Technology of China (Grant No. HQ14006).

Material properties dependent on the thermal transport in a cylindrical nanowire

Zhang Yong (张勇)a, Xie Zhong-Xiang (谢忠祥)a, Deng Yuan-Xiang (邓元祥)a, Yu Xia (喻霞)a, Li Ke-Min (李科敏)b   

  1. a Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, China;
    b Department of Physics and Electronics Information, Hunan Institute of Science and Technology, Yueyang 414004, China
  • Received:2015-04-23 Revised:2015-08-04 Online:2015-12-05 Published:2015-12-05
  • Contact: Xie Zhong-Xiang, Yu Xia E-mail:xiezxhu@163.com;yuxia83@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11404110), the Natural Science Foundation of Hunan Province, China (Grant Nos. 14JJ3139, 2015JJ6027, and 2015JJ6030), the Outstanding Young Program from the Education Department of Hunan Province, China (Grant No. 14B046), and the Doctoral Activation Foundation of Hunan Institute of Technology of China (Grant No. HQ14006).

摘要: Using the elastic wave continuum model, we investigate the effect of material properties on ballistic thermal transport in a cylindrical nanowire. A comparative analysis for the convexity-shaped and concavity-shaped structure is made. It is found that in the convexity-shaped structure, the material with higher wave velocity in the convexity region can increase the thermal conductance at the lower temperature range; the thermal conductance of the nanowire with higher wave velocity in the convexity region is lower than that of the nanowire with lower wave velocity in the convexity region at the higher temperature range. However, in the concavity-shaped structure, the material properties of the concavity region have less effect on the thermal conductance at the lower temperature range; the material with higher wave velocity in the concavity region can reduce the thermal conductance at the higher temperature range. A brief analysis of these results is given.

关键词: acoustic phonon transport, nanostructure, transmission coefficient, thermal conductance

Abstract: Using the elastic wave continuum model, we investigate the effect of material properties on ballistic thermal transport in a cylindrical nanowire. A comparative analysis for the convexity-shaped and concavity-shaped structure is made. It is found that in the convexity-shaped structure, the material with higher wave velocity in the convexity region can increase the thermal conductance at the lower temperature range; the thermal conductance of the nanowire with higher wave velocity in the convexity region is lower than that of the nanowire with lower wave velocity in the convexity region at the higher temperature range. However, in the concavity-shaped structure, the material properties of the concavity region have less effect on the thermal conductance at the lower temperature range; the material with higher wave velocity in the concavity region can reduce the thermal conductance at the higher temperature range. A brief analysis of these results is given.

Key words: acoustic phonon transport, nanostructure, transmission coefficient, thermal conductance

中图分类号:  (Phonons or vibrational states in low-dimensional structures and nanoscale materials)

  • 63.22.-m
73.23.Ad (Ballistic transport) 44.10.+i (Heat conduction)