Thermal Conductivity of Single-Walled Carbon Nanotube Suspensions in Ethylene Glycol: Experimental Results and Theoretical Limits
In the present work, we report measurements of the effective thermal conductivity of dispersions of single-walled carbon nanotube (SWNT) suspensions in ethylene glycol. The SWNTs were synthesized using the alcohol catalytic chemical vapour deposition (ACCVD) method. Resonant Raman spectroscopy was employed to estimate the diameter distribution of the SWNTs based on the frequencies of the radial breathing mode peaks. The nanofluid was prepared by dispersing the SWNTs using sodium deoxycholate (SDC) as the surfactant. Nanotube loading of up to 0.3 wt％ was used. Thermal conductivity measurements were performed by the transient hot-wire technique. Good agreement, within an uncertainty of 2％, was found for published thermal conductivities of the pure fluids. The enhancement of thermal conductivity was found to increase linearly with respect to nanotube loading. The maximum enhancement in thermal conductivity was found to be 14.8％ at 0.3 wt％ loading. Experimental results were compared with the Hamilton-Crosser model, the Lu-Lin model, Nan‘s effective medium theory and the Hashin-Strikman model. It was found that the Hashin-Strikman model sets the most restrictive bounds for thermal conductivity enhancement on the basis of only volume fraction, while the other analytical models fail consistently to set restrictive bounds.Keywords: Nanofluid, Single-walled carbon nanotube, Thermal conductivity.
Nanofluid Single-walled carbon nanotube Thermal conductivity
S.Harish Kei Ishikawa Erik Einarsson Shinya Aikawa Makoto Watanabe Shohei Chiashi Junichiro Shiomi Shigeo Maruyama
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-865 Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-865 Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-865
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-6
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）