Enhanced thermal conductivity of ethylene glycol with single-walled carbon nanotube inclusions

Sivasankaran Harish, Kei Ishikawa, Erik Einarsson, Shinya Aikawa, Shohei Chiashi, Junichiro Shiomi, Shigeo Maruyama

Research output: Contribution to journalArticlepeer-review

129 Citations (Scopus)


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 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 nanotubes using a bile salt as the surfactant. Nanotube loading of up to 0.2 vol% 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 with respect to nanotube loading. The maximum enhancement in thermal conductivity was found to be 14.8% at 0.2 vol% loading. The experimental results were compared with literature results in similar dispersion medium. Experimental results were compared with the Hamilton-Crosser model, the Lu-Lin model, Nan's effective medium theory and the Hashin-Shtrikman model. Effective medium theory seems to predict the thermal conductivity enhancement reasonably well compared to rest of the models. Networking of nanotubes to form a tri-dimensional structure was considered to be the reason for the thermal conductivity enhancement.

Original languageEnglish
Pages (from-to)3885-3890
Number of pages6
JournalInternational Journal of Heat and Mass Transfer
Issue number13-14
Publication statusPublished - Jun 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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