QQ客服 官方微博 反馈留言

	碳纳米管的热导率:从弹道到扩散输运
	侯泉文 ; 曹炳阳 ; 过增元 ; Hou Quan-Wen ; Cao Bing-Yang ; Guo Zeng-Yuan
	2010-06-07 ; 2010-06-07
关键词	碳纳米管 热导率 弹道输运 低维导热 carbon nanotube, thermal conductivity, ballistic transport, low-dimensional heat conduction TB383.1
其他题名	Thermal conductivity of carbon nanotube:From ballistic to diffusive transport
中文摘要	采用非平衡分子动力学方法研究了300K和1000K时(5,5)碳纳米管热导率随长度的变化.在室温下,碳纳米管长度小于40nm时热导率与长度呈线性关系,此时导热处于弹道输运阶段,单位面积弹道热导为5.88×109Wm-2K-1.随着碳纳米管长度的增加,其热导率逐渐增加,但增加速度随长度逐渐减小,此时导热处于弹道—扩散输运阶段,并随长度的增加从以弹道输运为主向以扩散输运为主转变.长度大于10μm时由于弹道输运可以忽略,导热近似达到完全扩散输运.模拟发现碳纳米管热导率随长度变化的幂指数随着碳纳米管长度的增加而成衰减指数的规律减小,与理想一维材料不同,在热力学极限下碳纳米管导热会出现完全扩散输运,其热导率将收敛到有限值.; Length dependence of the thermal conductivity of (5, 5) carbon nanotube at 300 K and 1000 K is studied by nonequilibrium molecular dynamics simulations. At room temperature the thermal conductivity shows linear length dependence for the tube length less than 40 nm, which shows completely ballistic transport. The calculated ballistic thermal conductance per unit area is 5.88×109 Wm-2K-1. The thermal conductivity increases with the increase of the nanotube length, but the increase rate decreases as the length increases. It shows that the phonon transport is in the ballistic-diffusive regime, and transits from ballistic to diffusive with increase of the tube length. The thermal conduction is close to completely diffusive transport and the ballistic transport can be ignored when the nanotube is longer than 10 μm. In the simulations, the power exponent of the thermal conductivity of carbon nanotube to the tube length decreases by decaying exponential function as the tube length increases. Different from one-dimensional material, in the thermodynamic limit, a completely diffusive transport will dominate the thermal transport in carbon nanotubes, and the thermal conductivity will converge to a finite value.; 国家自然科学基金(批准号:50606018); 清华信息科学与技术国家实验室学科交叉基金资助的课题~~
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/37650]
专题	清华大学
推荐引用方式 GB/T 7714	侯泉文,曹炳阳,过增元,等. 碳纳米管的热导率:从弹道到扩散输运[J],2010, 2010.
APA	侯泉文,曹炳阳,过增元,Hou Quan-Wen,Cao Bing-Yang,&Guo Zeng-Yuan.(2010).碳纳米管的热导率:从弹道到扩散输运..
MLA	侯泉文,et al."碳纳米管的热导率:从弹道到扩散输运".(2010).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。