Rheological and heat transfer behaviour of the ionic liquid, [C(4)mim][NTf2]

Haisheng Chen, Yurong He, Jianwel Zhu, Hajar Alias, Yulong Ding*, Paul Nancarrow, Christopher Hardacre, David Rooney, Chunqing Tan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


Systematic experiments have been carried out on the thermal and rheological behaviour of the ionic liquid, 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl} imide, [C(4)mim][NTf2], and, for the first time, on the forced convective heat transfer of an ionic liquid under the laminar flow conditions. The results show that the thermal conductivity of the ionic liquid is similar to 0.13 W m(-1) K-1, which is almost independent of temperature between 25 and 40 degrees C. Rheological measurements show that the [C(4)mim][NTf2] liquid is a Newtonian fluid with its shear viscosity decreasing with increasing temperature according to the exponential law over a temperature range of 20-90 degrees C. The convective heat transfer experiments demonstrate that the thermal entrance length of the ionic liquid is very large due to its high viscosity and low thermal conductivity. The convective heat transfer coefficient is observed to be much lower than that of distilled water under the same conditions. The convective heat transfer data are also found to fit well to the convectional Shah's equation under the conditions of this work. (C) 2007 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)149-155
Number of pages7
JournalInternational Journal of Heat and Fluid Flow
Issue number1
Publication statusPublished - Feb 2008


  • viscosity
  • thermal conductivity
  • rheological behaviour
  • convective heat transfer coefficient
  • ionic liquid
  • thermal entrance length


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