Tsinghua-Foxconn Nanotechnology Research Center and Department of Physics, Tsinghua University , Beijing 100084, People's Republic of China.
ACS Appl Mater Interfaces. 2014 Mar 12;6(5):3075-80. doi: 10.1021/am405491t. Epub 2014 Feb 20.
In this work, we report our studies related to the natural-convective heat transfer properties of carbon nanotube (CNT) sheets. We theoretically derived the formulas and experimentally measured the natural-convective heat transfer coefficients (H) via electrical heating method. The H values of the CNT sheets containing different layers (1, 2, 3, and 1000) were measured. We found that the single-layer CNT sheet had a unique ability on heat dissipation because of its great H. The H value of the single-layer CNT sheet was 69 W/(m(2) K) which was about twice of aluminum foil in the same environment. As the layers increased, the H values dropped quickly to the same with that of aluminum foil. We also discussed its roles on thermal dissipation, and the results indicated that the convection was a significant way of dissipation when the CNT sheets were applied on macroscales. These results may give us a new guideline to design devices based on the CNT sheets.
在这项工作中，我们报告了与碳纳米管（CNT）片自然对流换热特性相关的研究。我们从理论上推导出公式，并通过电加热法实验测量了自然对流换热系数（H）。测量了含有不同层数（1、2、3 和 1000）的 CNT 片的 H 值。我们发现，由于其高 H 值，单层 CNT 片具有独特的散热能力。单层 CNT 片的 H 值为 69 W/（m² K），约为相同环境下铝箔的两倍。随着层数的增加，H 值迅速下降到与铝箔相同。我们还讨论了它在热耗散方面的作用，结果表明，当 CNT 片应用于宏观尺度时，对流是一种重要的耗散方式。这些结果可能为我们基于 CNT 片设计器件提供新的指导。
