Enhancement of thermal conductivity with carbon nanotube for nanofluids

Min Sheng Liu, Mark Ching-Cheng Lin, I. Te Huang, Chi-Chuan Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

437 Scopus citations


Thermal conductivity enhancements in ethylene glycol and synthetic engine oil in the presence of multi-walled carbon nanotubes (MWNTs) are investigated. CNT nanofluids are prepared using a two-step method. The volume concentration of CNT-ethylene glycol suspensions is below 1.0 vol.% and that of CNT-synthetic engine oil suspensions is below 2.0 vol.%. The thermal conductivities of the CNT suspensions are measured with a modified transient hot wire method. The results show that CNT-ethylene glycol suspensions have noticeably higher thermal conductivities than the ethylene glycol base fluid without CNT. The results for CNT-synthetic engine oil suspensions also exhibit the same trend. For CNT-ethylene glycol suspensions at a volume fraction of 0.01 (1 vol.%), thermal conductivity is enhanced by 12.4%. On the other hand, for CNT-synthetic engine oil suspension, thermal conductivity is enhanced by 30% at a volume fraction of 0.02 (2 vol.%). The rates of increase are, however, different for different base fluids. The CNT-synthetic engine oil suspension has a much higher enhanced thermal conductivity ratio than the CNT-ethylene glycol suspension.

Original languageEnglish
Pages (from-to)1202-1210
Number of pages9
JournalInternational Communications in Heat and Mass Transfer
Issue number9
StatePublished - 1 Oct 2005


  • Carbon nanotube
  • Nanofluids
  • Thermal conductivity

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